dynamic testing of a scaled laboratory physical model structure using … · 2019. 4. 15. ·...
TRANSCRIPT
![Page 1: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/1.jpg)
DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING THE UPRMEARTHQUAKE SIMULATOR FACILITY
Emerson ClermontEdgardo MuñizSamuel MontalvoSteven A AvilesPreiser BrunatOrlando FloresDarlene LopezAndrea Cruz
![Page 2: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/2.jpg)
AGENDA
SECTION I
- Introduction
Shaking Table
- Calibration of Shaking Table
- Prototype and Model
SECTION II
Model in SAP2000 without dampers
SECTION III
Model in SAP2000 with dampers
SECTION IV
-Conclusions
- Recommendations
![Page 3: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/3.jpg)
INTRODUCTIONIn 1960 the experimental earthquake simulation was first introduced to the research world. The first servo valves were built between 1960 and 1970. There are three ways to classify shaking tables:• small (<10 feet)• medium (10-30 feet)• large (> 30 feet )
There are a varying products of shaking tables for structures such as one dimensional, bi dimensional and tridimensional. Tridimensional shaking tables are ideals for modeling scaled earthquakes. The shaking tables components:
1. Reaction Mass2. Simulator Rigid Platform3. Linear Roller Bearings4. Hydraulic Power Unit5. Servo valve and Actuator6. Sevo-Controller7. Control & Data Acquisition8. Instrumentation for Measurements
![Page 4: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/4.jpg)
SHAKING TABLES
Rice University• Small shaking table• Dimensions 5x5 ft• Payload Limit 1500 lb
State University of New York at Buffalo• Medium shaking table• Dimensions 12x12 ft• Payload Limit 44000 lb
![Page 5: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/5.jpg)
SHAKING TABLES
E-Defense Japan• Large shaking table• Dimensions 50x50 ft• Payload Limit 1000 kip
![Page 6: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/6.jpg)
CLOSED LOOP CONTROL
![Page 7: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/7.jpg)
UPRM EARTHQUAKE SIMULATION▪ The design concept of the UPRM
Earthquake Simulator was the designof a small unidirectional servo-hydraulic shaking table facility.
▪ The final design consists of a rigidplatform sliding over a nearfrictionless linear bearing system and driven by an actuator attached to a reaction frame.
![Page 8: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/8.jpg)
UPRM EARTHQUAKE SIMULATOR MAIN PROPERTIES
![Page 9: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/9.jpg)
REACTION FRAME
• The reaction frame isconnected tothe StructuralLaboratory floor
• It's important tomeasure the reactionframe's motion duringtests with connections tostrong floor
![Page 10: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/10.jpg)
SIMULATOR RIGID PLATFORM
![Page 11: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/11.jpg)
LINEAR ROLLER BEARINGS
![Page 12: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/12.jpg)
HYDRAULIC POWER UNIT
The Hydraulic Power Supply (pump) installedin the laboratory is a MTS Model 506.61 and israted at 265.0 l/min (70 gpm) of steady flow[24]. A Hydraulic Service Manifold (HSM) MTS Model 293.11, with a rated capacity of 190.0 l/min (50 gpm), is mounted between the HPS and the servovalves.
![Page 13: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/13.jpg)
HYDRAULIC POWER UNIT
• Hydraulic power systems typicallyconsist of an arrangement ofhydraulic power supplies, remoteservices manifolds, and accesoryequipement.
• These components integrate intoa hydraulic powerdistribution network to providehydraulic fluid power to servo-controlled actuators
![Page 14: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/14.jpg)
SERVO VALVE AND ACTUATOR
• The servovalve ports thefluid, provided by the hydraulicpower system, into theappropriate side of the actuator'schambers. This causes theactuator's piston to move theactuator's arm in the desireddirection.
• The linear actuator system alsoconsists of a load cell transducer, which measures force.
![Page 15: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/15.jpg)
SERVO-CONTROLLER
The servo-controller utilizes two levels ofcontrol to regulate the displacement of theactuator:
• Inner loop: it regalutes the portingof fluid by the servo-valves. This is thelowest level of control.
• Outer loop: utilizes thedisplacement signal of the LVDT mounted on the actuator and compares it to the command signal sent by thecontrol computer.
![Page 16: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/16.jpg)
CALIBRATION OF SHAKING TABLE
▪ “Proportional gain” (P)
▪ Proportional gain increases system response by boosting the effect of the errorsignal on the servovalve. As proportional gain increases, the error decreases andthe feedback signal tracks the command signal more closely. Too muchproportional gain can cause the system to become unstable. In the otherdirection, too little proportional gain can cause the system to become sluggish.
![Page 17: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/17.jpg)
CALIBRATION OF SHAKING TABLE
▪ “Integral gain” (I)
▪ This value increases the response of the system when a signal with lowfrequencies or static is considered. In cases of high frequencies, it maintains theaverage. When a signal is used with low frequencies or static, the signal thatreturns usually has a "spring" effect due to the selvo-valves. This parametercorrects this behavior.
![Page 18: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/18.jpg)
CALIBRATION OF SHAKING TABLE
▪ “Derivative gain” (D)
▪ This parameter is considered when performing dynamic tests. Anticipate therate of change in the signal received. It also reduces the noise caused by using ahigh "proportional gain". If this value is greatly increased, it can cause instabilityat high frequencies. Using a very low value can cause a rumbling sound.
![Page 19: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/19.jpg)
CALIBRATION OF SHAKING TABLE
▪ “Feed Forward Gain” (F)
▪ This parameter anticipates how much the valve should open to obtain therequired response. It is used to minimize the delay of the phase. It helps theservo-control to react correctly when there is an abrupt change in the signal.
![Page 20: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/20.jpg)
BARE TABLE CALIBRATION GROUP 1
▪ Group 1
Calibration of Shake Table for Frequencies from 1 Hz- 5 Hz
Frequecies (Hz)
Command Signal/Amp
(inches)
P-gain I-gain Response Displacement
(inches)
Error (%)
1 0.125 2.4 0.2 0.1261 0.88
2 0.125 2.4 0.2 0.1221 2.32
3 0.125 2.4 0.2 0.1146 8.32
4 0.125 2.4 0.2 0.1054 15.68
5 0.125 2.4 0.2 0.09596 23.23
![Page 21: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/21.jpg)
CALIBRATION GROUP 1
Error Percent vs Frequency
Frequency [Hz]
Erro
r [%
]
Amplitude Phase Delay
![Page 22: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/22.jpg)
LOAD TABLE CALIBRATION GROUP 1
Calibration of Shake Table for Frequencies from 1 Hz- 5 Hz
Frequecies (Hz)
Command Signal/Amp
(inches)
P-gain I-gain Response Displacement
(inches)
Error (%)
1 0.125 2.4 0.2 0.1275 2
2 0.125 2.4 0.2 0.1238 0.96
3 0.125 2.4 0.2 0.1162 7.04
4 0.125 2.4 0.2 0.1078 13.76
5 0.125 2.4 0.2 0.09939 20.49
![Page 23: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/23.jpg)
CALIBRATION GROUP 1
![Page 24: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/24.jpg)
BARE TABLE CALIBRATION GROUP #2
▪ Frequencies: 5 Hz-10Hz
Calibration of Shake Table for Frequencies from 5 Hz- 10 Hz
Frequecies (Hz)
Command Signal/Amp
(inches)
P-gain I-gain Response Displacement (inches)
Error (%)
5 0.125 2.4 0.2 0.09687 22
6 0.125 2.4 0.2 0.0883 29
7 0.125 2.4 0.2 0.08202 34
8 0.125 2.4 0.2 0.07533 39
9 0.125 2.4 0.2 0.06878 45
10 0.125 2.4 0.2 0.0639 48
![Page 25: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/25.jpg)
FLEXIBLE STRUCTURE CALIBRATION
Calibration of Shake Table for Frequencies from 1 Hz- 5 Hz
Frequecies (Hz)
Command Signal/Amp
(inches)
P-gain I-gain Response Displacement
(inches)
Error (%)
1 0.25 2.0 0.15 0.2531 1.2
0.5 0.5 2.0 0.15 0.5032 0.64
1 0.5 2.0 0.15 0.4984 0.32
![Page 26: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/26.jpg)
LOAD TABLE CALIBRATION GROUP #3
Frequencies (Hz)
Command Signal/Amp (inches)
P-gain I-gainResponse Displacement (inches)
Error (%)
11 0.125 3 0.2 0.07376 40.912 0.125 3 0.2 0.07243 41.813 0.125 3 0.2 0.07135 42.914 0.125 3 0.2 0.07115 4315 0.125 3 0.2 0.07067 43.4
▪ Frequencies: 11 Hz-15Hz
![Page 27: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/27.jpg)
BARE TABLE CALIBRATION GROUP #3
Frequencies (Hz)
Command Signal/Amp (inches)
P-gain I-gainResponse Displacement (inches)
Error (%)
11 0.125 3 0.2 0.07376 35.312 0.125 3 0.2 0.07243 38.213 0.125 3 0.2 0.07135 38.214 0.125 3 0.2 0.07115 35.615 0.125 3 0.2 0.07067 37.8
▪ Frequencies: 11 Hz-15Hz
![Page 28: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/28.jpg)
STRUCTURE
“Side View”
12’
12’
12’
18’
12’
“Top View”
Columns: W12x53Beams: W10x30
▪ Prototype
![Page 29: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/29.jpg)
STRUCTURE
▪ Similitude Relationships for Artificial Mass Simulation Method.
▪ Same material in the model test structure as in the prototype structure
▪ λg = λE = 1
▪ λL = 4
![Page 30: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/30.jpg)
STRUCTURE
▪ Model
“Side View”
36 1/4”
35 1/4”
37 7/8”
54 1/8”
35 3/4”
“Top View”
Columns: S3x5.7Beams: S3x5.7
![Page 31: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/31.jpg)
STRUCTURE (ARTIFICIAL MASS SIMULATION)
![Page 32: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/32.jpg)
STRUCTURE (ARTIFICIAL MASS SIMULATION)
![Page 33: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/33.jpg)
STRUCTURE (ARTIFICIAL MASS SIMULATION)
![Page 34: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/34.jpg)
STRUCTURE (ARTIFICIAL MASS SIMULATION)
![Page 35: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/35.jpg)
STRUCTURE (ARTIFICIAL MASS SIMULATION)
![Page 36: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/36.jpg)
SAP2000 MODEL PROPERTIES
▪ Linear 3D Model
▪ 3 Story Building
▪ Natural Frequency: 8.28209 Hz
▪ Period of Structure: 0.12074 s
![Page 37: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/37.jpg)
LOMA PRIETA 1989 EARTHQUAKE
-0.3
-0.25
-0.2
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0.2
0.25
0.3
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
Ace
lera
cio
n [
g]
Tiempo [s]
Loma Prieta 1989
![Page 38: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/38.jpg)
IMPERIAL VALLEY(EL CENTRO) EARTHQUAKE
![Page 39: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/39.jpg)
SAP2000 – WITHOUT DAMPERS DISPLACEMENT AND ACCELERATIONFIRST FLOOR (LOMA PRIETA)
▪ Displacement [in] ▪ Acceleration [in/s^2]
![Page 40: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/40.jpg)
▪ Displacement [in] ▪ Acceleration [in/s^2]
SAP2000 – WITHOUT DAMPERS DISPLACEMENT AND ACCELERATIONSECOND FLOOR
![Page 41: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/41.jpg)
▪ Displacement [in] ▪ Acceleration [in/s^2]
SAP2000 – WITHOUT DAMPERS DISPLACEMENT AND ACCELERATIONTHIRD FLOOR
![Page 42: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/42.jpg)
DAMPERS CONFIGURATIONS
![Page 43: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/43.jpg)
SAP2000 RESULTS FOR CONFIGURATION #1
▪ Damping of dampers: 0.45 kip*s/in
▪ Natural frequency of Structure: 8.28209 Hz
▪ Period of Structure: 0.12 s
![Page 44: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/44.jpg)
SAP2000 – WITH DAMPERS DISPLACEMENT AND ACCELERATIONFIRST FLOOR
▪ Displacement [in] ▪ Acceleration [in/s^2]
-0.05
-0.04
-0.03
-0.02
-0.01
0
0.01
0.02
0.03
0.04
0.05
0 2 4 6 8 10 12
Dis
pla
cem
ent
(in
)
Time (s)
First Floor Displacement
Sin Dampers Con Dampers
-150
-100
-50
0
50
100
150
0 2 4 6 8 10 12
Acc
eler
atio
n (
in/s
^2)
Time (s)
First Floor Acceleration
Sin Dampers Con Dampers
Without dampers: 0.04158 inWith dampers: 0.01677 inDifference: 59.67%
Without dampers: 113.85 in/s^2With dampers: 39.01 in/s^2Difference: 65.73%
![Page 45: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/45.jpg)
▪ Displacement [in] ▪ Acceleration [in/s^2]
SAP2000 – WITH DAMPERS DISPLACEMENT AND ACCELERATIONSECOND FLOOR
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0 2 4 6 8 10 12
Dis
pla
cem
ent
(in
)
Time (s)
Second Floor Displacement
Sin Dampers Con Dampers
-250
-200
-150
-100
-50
0
50
100
150
200
250
0 2 4 6 8 10 12
Acc
eler
atio
n (
in/s
^2)
Time (s)
Second Floor Acceleration
Sin Dampers Con Dampers
Without dampers: 0.09307 inWith dampers: 0.03579 inDifference: 61.55%
Without dampers: 210.05 in/s^2With dampers: 86.21 in/s^2Difference: 58.96%
![Page 46: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/46.jpg)
▪ Displacement [in] ▪ Acceleration [in/s^2]
SAP2000 – WITH DAMPERS DISPLACEMENT AND ACCELERATIONTHIRD FLOOR
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0 2 4 6 8 10 12
Dis
pla
cem
ent
(in
)
Time (s)
Third Floor Displacement
Sin Dampers Con Dampers
-400
-300
-200
-100
0
100
200
300
400
0 2 4 6 8 10 12
Acc
eler
atio
n (
in/s
^2)
Time (s)
Third Floor Acceleration
Sin Dampers Con Dampers
Without dampers: 0.12804 inWith dampers: 0.04794 inDifference: 62.56%
Without dampers: 294.09 in/s^2With dampers: 117.74 in/s^2Difference: 59.96%
![Page 47: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/47.jpg)
SAP2000 RESULTS FOR CONFIGURATION #2
▪ Effective damping of each dampers: 0.45 kip*s/in
▪ Natural frequency of Structure: 8.28209 Hz
▪ Period of Structure: 0.12 s
![Page 48: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/48.jpg)
SAP2000 – WITH DAMPERS DISPLACEMENT AND ACCELERATIONFIRST FLOOR
▪ Displacement [in] ▪ Acceleration [in/s^2]
![Page 49: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/49.jpg)
▪ Acceleration [in/s^2]▪ Displacement [in]
SAP2000 – WITH DAMPERS DISPLACEMENT AND ACCELERATIONSECOND FLOOR
![Page 50: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/50.jpg)
▪ Displacement [in] ▪ Acceleration [in/s^2]
SAP2000 – WITH DAMPERS DISPLACEMENT AND ACCELERATIONTHIRD FLOOR
![Page 51: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/51.jpg)
SUMMARY OF RESULTS
![Page 52: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/52.jpg)
SAP2000 RESULTS FOR CONFIGURATION #3
▪ Damping of dampers: 0.45 kip*s/in
▪ Natural frequency of Structure: 8.28209 Hz
▪ Period of Structure: 0.12 s
![Page 53: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/53.jpg)
▪ Displacement [in] ▪ Acceleration [in/s^2]
SAP2000 – WITH DAMPERS DISPLACEMENT AND ACCELERATIONFIRST FLOOR
![Page 54: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/54.jpg)
▪ Displacement [in] ▪ Acceleration [in/s^2]
SAP2000 – WITH DAMPERS DISPLACEMENT AND ACCELERATIONSECOND FLOOR
![Page 55: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/55.jpg)
▪ Displacement [in] ▪ Acceleration [in/s^2]
SAP2000 – WITH DAMPERS DISPLACEMENT AND ACCELERATIONTHIRD FLOOR
![Page 56: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/56.jpg)
SUMMARY OF RESULTS
![Page 57: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/57.jpg)
PERFORMANCE BASED DESIGN – NONSTRUCTURAL COMPONENTS
![Page 58: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/58.jpg)
PERFORMANCE BASED DESIGN – NONSTRUCTURAL COMPONENTS
![Page 59: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/59.jpg)
PERFORMANCE BASED DESIGN – NONSTRUCTURAL COMPONENTS
![Page 60: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/60.jpg)
PERFORMANCE BASED DESIGN – NONSTRUCTURAL COMPONENTS
![Page 61: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/61.jpg)
PERFORMANCE BASED DESIGN – NONSTRUCTURAL COMPONENTS
![Page 62: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/62.jpg)
PERFORMANCE BASED DESIGN – NONSTRUCTURAL COMPONENTS
![Page 63: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/63.jpg)
INPUT PARAMETERS FOR RESPONSE EVALUATION USING MATLAB EXTENDED MODAL ANALISIS–
NO DAMPER CONFIGURATION
Configuration #2
Items Story 1 Story 2 Story 3
Gravity (in/s^2) 386.4 386.4 386.4
Weight (kip) 0.7883 0.7868 0.7533
K (stiffness, kip/in) 36.153 39.726 36.528
Height (in) 36.375 35.25 36.25
Length (in) 51.1875 51.1875 51.1875
Z (damping) 0.02 0.02 0.02
C (damping coefficient) 0 0 0
Degrees of Freedom 3 3 3
Time Step (scaled, s) 0.001 0.001 0.001
![Page 64: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/64.jpg)
RESPONSE USING MATLAB(EXTENDED MODAL ANALISIS)NO DAMPER CONFIGURATION
Configuration #1 Results for 1st, 2nd, and 3rd Story
Items Story 1 Story 2 Story 3
PGA (g) 0.27 0.27 0.27
Natural Frequencies (rad/s)
60.981 168.72 247.37
Natural Period (s) 0.10303 0.037241 0.0254
Damping Ratio 0.0020 0.0020 0.0020
Max. Relative Displacement to Base
(in)
0.038777 0.065466 0.080356
Max Relative Displacement
0.031609 0.021762 0.012231
Max Damping Force 0 0 0
![Page 65: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/65.jpg)
INPUT PARAMETERS FOR RESPONSE EVALUATION IN MATLAB
CONFIGURATION #1Configuration #3
Items Story 1 Story 2 Story 3
Gravity (in/s^2) 386.4 386.4 386.4
Weight (kip) 0.7883 0.7868 0.7533
K (stiffness, kip/in) 36.153 39.726 36.528
Height (in) 36.375 35.25 36.25
Length (in) 51.1875 51.1875 51.1875
Z (damping) 0.02 0.02 0.02
C (damping coefficient) 0.9 0 0.9
Degrees of Freedom 3 3 3
Time Step (scaled,s) 0.001 0.001 0.001
![Page 66: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/66.jpg)
RESPONSE FOR MATLAB(EXTENDED MODAL ANALISIS)
CONFIGURATION #1Configuration #1 Results for 1st, 2nd, and 3rd Story
Items Story 1 Story 2 Story 3
PGA (g) 0.27 0.27 0.27
Natural Frequencies (rad/s)
60.981 168.72 247.37
Natural Period (s) 0.10303 0.037241 0.0254
Damping Ratio 1.0000 1.0000 1.0000
Max. Relative Displacement to Base
(in)
0.021365 0.036392 0.043783
Max Relative Displacement
0.80909 0.96074 0.33335
Max Damping Force 0.72818 0 0.30001
![Page 67: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/67.jpg)
INPUT PARAMETERS FOR RESPONSE EVALUATION IN MATLAB
CONFIGURATION #2Configuration #2
Items Story 1 Story 2 Story 3
Gravity (in/s^2) 386.4 386.4 386.4
Weight (kip) 0.7883 0.7868 0.7533
K (stiffness, kip/in) 36.153 39.726 36.528
Height (in) 36.375 35.25 36.25
Length (in) 51.1875 51.1875 51.1875
Z (damping) 0.02 0.02 0.02
C (damping coefficient) 0.9 0.9 0
Degrees of Freedom 3 3 3
Time Step (scaled,s) 0.001 0.001 0.001
![Page 68: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/68.jpg)
RESPONSE MATLAB(EXTENDED MODAL ANALISIS)
CONFIGURATION #2Configuration #2 Results for 1st, 2nd, and 3rd Story
Items Story 1 Story 2 Story 3
PGA (g) 0.27 0.27 0.27
Natural Frequencies (rad/s)
60.981 168.72 247.37
Natural Period (s) 0.10303 0.037241 0.0254
Damping Ratio 0.4811 0.4811 0.4811
Max. Relative Displacement to Base
(in)
0.019194 0.031627 0.038542
Max Relative Displacement (in)
0.015646 0.01014 0.0074249
Max Damping Force (kip)
0.63209 0.46243 0
![Page 69: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/69.jpg)
INPUT PARAMETERS FOR RESPONSE EVALUATION FOR MATLAB
CONFIGURATION #3Configuration #2
Items Story 1 Story 2 Story 3
Gravity (in/s^2) 386.4 386.4 386.4
Weight (kip) 0.7883 0.7883 0.7883
K (stiffness, kip/in) 36.153 39.726 36.528
Height (in) 36.375 35.25 36.25
Length (in) 51.1875 51.1875 51.1875
Z (damping) 0.02 0.02 0.02
C (damping coefficient) 0.9 0 0
Degrees of Freedom 3 3 3
Time Step (scaled, s) 0.001 0.001 0.001
![Page 70: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/70.jpg)
RESPONSE FOR MATLAB(EXTENDED MODAL ANALISIS)
CONFIGURATION #3Configuration #1 Results for 1st, 2nd, and 3rd Story
Items Story 1 Story 2 Story 3
PGA (g) 0.27 0.27 0.27
Natural Frequencies (rad/s)
60.981 168.72 247.37
Natural Period (s) 0.10303 0.037241 0.0254
Damping Ratio 0.2554 0.2554 0.2554
Max. Relative Displacement to Base
(in)
0.022988 0.039868 0.049721
Max Relative Displacement
0.76984 0.88445 0.67351
Max Damping Force 0.69285 0 0
![Page 71: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/71.jpg)
SAP RESPONSE SPECTRUM CURVES
![Page 72: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/72.jpg)
EXCITATION VS RESPONSE OF THE SYSTEM
Experimental Run: "Setup 3"Loma Prieta
Top => at floor 3Bot => Shake Table
![Page 73: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/73.jpg)
FOURIER TRANSFORM
![Page 74: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/74.jpg)
ACCELERATION TOP VS BOTTOM RATIO
Natural frequency of Structure:
From Analytical SAP2000 model8.282 Hz
From MATLAB Modal Analisis model9.706 Hz
Run ID "Set-up 3" : Loma Prieta
![Page 75: DYNAMIC TESTING OF A SCALED LABORATORY PHYSICAL MODEL STRUCTURE USING … · 2019. 4. 15. · HYDRAULIC POWER UNIT The Hydraulic Power Supply (pump) installed in the laboratory is](https://reader035.vdocuments.us/reader035/viewer/2022071402/60f10d367fdd7d78cf284f64/html5/thumbnails/75.jpg)
RECOMMENDATIONS
1 – For rigid diaphragm action a steel plate welded all around to the perimeter holding angles shall be used instead of the actual grating which reflects a semi-rigid diaphragm action instead.
2 – The effects of the column splices at mid-height shall be taken into account on the numerical model representing the additional stiffness they provide to the columns.
3 - The beam-to-column joints shall be modeled as semi-rigid joints instead of fixed joints or, as an alternative, gusset plates between beams and columns could be welded.
4- Maintain a data base of the calibration parameters used in previous studies in order to have these as starting points.