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Process of Seismic SimulationProcess of Seismic Simulation of a 2-Bay, 2-Story RC Building
Michelle StadelNSF Summer Scholar University of Houston
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OVERVIEWOVERVIEW
• National Center for Research on Earthquake qEngineering project
• Open System for EarthquakeEngineering Simulation
• Basics of Tcl/Tk script• 2D Frame example simulation• NCREE structure simulation
R l• Results• Additional research
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NCREE Projectj
St d ff t f t i d lti• Study effects of torsion and multi-directional loading on RC structure
• Study real-time data and incorporate computer simulations for applications beyond the project
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NNCCCCRREEEEEE
PPRRRROOJJJJEECCCCTT
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OpenSeesOpen System for Earthquake Engineering Simulation
• Developed by Pacific Earthquake Engineering Research Center & the University of California, Berkeley
• Object-oriented framework for finite element analysis
• Uses Tcl/Tk script
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BBasics of Tcl/Tk Script
Basic syntax -- Command argument1 argument2
Example: expr 20 + 10
The set command writes and reads variables.
$ ll i l d fi d i bl$ recalls previously defined variables.
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M d l f O SModules for OpenSees
MODEL RECORDER ANALYSIS
Defines: Creates an output Defines objects Defines:
• Coordinate system
• Beams
Creates an output file that records data of interest to the programmer.
e es objec snecessary for performing the analysis
• Columns
• Materials
• Cross-sections
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2-D frame problem2 D frame problem
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ModelingModeling
• ModelModel• Node
C t i t Column cross section• Constraints• Materials
Column cross-section
• Section• ElementElement• Load
Beam cross-section
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RecorderRecorder# Define LATERAL LOADS ---------------------------# Define LATERAL LOADS pattern Plain 1 Linear {
# nodeID Fx Fy Mz# nodeID Fx Fy Mzload 15 100.0 0.0 0.0
}}# Create RECORDERS --------------------------------recorder Node file Node15 out time node 15recorder Node -file Node15.out -time -node 15 -dof 1 disp
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AnalysisAnalysissystem BandGeneralconstraints Transformationnumberer RCMtest NormDispIncr 1.0e-12 50 0algorithm Newton integrator DisplacementControl 15 1 0.1analysis Staticinitializeanalyze 50
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2-D frame results Ulti t St th2 D frame results70
Ultimate Strength64 kips
50
60
30
40
Load
(kip
s)
Ruptures at 63 kips
10
20
L
Modulus of Elasticity
00 2 4 6 8 10 12
Displacement (inches)
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2-story 2-bay RC building2 story, 2 bay RC building
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Column cross-section
2-story, 2-bay2 story, 2 bay RC building
Beam cross-section
Model differences:
• Numbering of nodes
C tiBeam cross section • Cross-sections
• Section aggregators
• Loadingg
• Shear walls
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Shear WallsShear Walls• Reinforced concrete plane• Reinforced concrete plane
stress elements• Modeled by standard brick• Modeled by standard brick
elementM t i l l ti i t i• Material – elastic isotropic
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600
700
ResultsResults400
500
600
ad (k
N)
ResultsResults100
200
300Loa
00 1 2 3 4 5
Displacement (mm)
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On-going Researchg g• Work is continuing to fine tune to the
OpenSees program to simulate the structure’s response to earthquake loading.
• The structure is set to be tested next week in Taiwan.
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References• Howser, Rachel, A. Laskar, Y.L. Mo. (2007) “Seismic Interaction of Flexural
Ductility and Shear Capacity in Reinforced Concrete Columns.”• Hwang, S.J., M. Saiid Saiidi, Sara Wadia-Fascetti, JoAnn Browning, Jerry P. Lynch,
Kamal Tawfig, K.C. Tsai, G. Song, Y.L. Mo. (2006) “Experiments and Simulation of Reinforced Concrete Buildings Subjected to Reversed Cyclic Loading and Shake Table Excitation.”
• Mazzoni Silvia Frank McKenna Michael H Scott Gregory L Fenves et al• Mazzoni, Silvia, Frank McKenna, Michael H. Scott, Gregory L. Fenves, et. al. (2006). “Open System for Earthquake Engineering Simulation User Command-Language Manual,” Pacific Earthquake Engineering Research Center, UC Berkeley, http://opensees.berkeley.edu/OpenSees/manuals/usermanual/index.html.
• Pacific Earthquake Engineering Research Center (PEER). (2001) “Open System for Earthquake Engineering Simulation.” http://peer.berkeley.edu/news/2001spring/opensees.htmlS h d D i l (2006) “S i i h S i A hi ”• Schwerd, Daniel. (2006) “Scriptics.com – the Script Archive.” http://dev.scriptics.com/software/tcltk/.
• Tseng, Chien-Chuang. (2006) Experiment of Reinforced Concrete Building Frame PresentationPresentation.
• http://bi-directional.blogspot.com/
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AcknowledgementThe research study described herein wasThe research study described herein was
sponsored by the National Science Foundation under the Award No EEC-Foundation under the Award No. EEC
0649163. The opinions expressed in this study are those of the authors and do notstudy are those of the authors and do not
necessarily reflect the views of the sponsorsponsor.