Download - URS – ARENA DISTRICT OFFICE BUILDING
URS – ARENA DISTRICT OFFICE BUILDING
DAVID LEE
STRUCTURAL OPTION
PRESENTATION OUTLINE
1. EXISTING CONDITIONS
2. DEPTH STUDY
3. BREADTH STUDY
4. CONCLUSION & RECOMMENDATION
David LeeStructural OptionURS – Arena District Office Building
PRESENTATION OUTLINE
1. EXISTING CONDITIONS
2. DEPTH STUDY
3. BREADTH STUDY
4. CONCLUSION & RECOMMENDATION
David LeeStructural OptionURS – Arena District Office Building
EXISTING CONDITIONS 1
• Located in Columbus, Ohio
• 5 story – 100,000 SF building
• March 2000 – January 2001
construction duration
• Total project cost $7 million
David LeeStructural OptionURS – Arena District Office Building Building Statistics
EXISTING CONDITIONS 2
David LeeStructural OptionURS – Arena District Office Building
OHIO BASIC BUILDING CODE 1998
STRUCTURAL STEEL
AISC Manual of Steel Construction
CAST IN PLACE
CONCRETE
ACI 318 – “Building Code Requirement for Reinforced Concrete”ACI 301-89 – “Specification for Structural Concrete for Buildings”
PRECAST CONCRETE
ACI 318 – “Building Code Requirement for Reinforced Concrete”PCI MNL 120 – “PCI Design Handbook Pre-cast and Pre-stressed Concrete”
METAL DECK
AISI – “Specification for the Design of Cold-formed Steel Structural Members”SDI – “Design Manual for Composite Decks, Form Deck, and Roof Decks”
MASONRY ACI 530.1/ASCE 6/TMS 602 Table 1
Building Code
EXISTING CONDITIONS 3
David LeeStructural OptionURS – Arena District Office Building Typical Floor Framing
EXISTING CONDITIONS 4
David LeeStructural OptionURS – Arena District Office Building
Lateral Load Direction
Factored Base Shear
Due to WIND
Factored Base Shear
Due to SEISMIC
North-South Loading
Considered Y281.38 kip 169.30 kips
East-West Loading Considered X
142.8 kips 169.30 kips
Existing Lateral System
Y
X
EXISTING CONDITIONS 5
David LeeStructural OptionURS – Arena District Office Building
Center of Mass
Center of Rigidity
FloorHeight (feet)
Floor to Floor
Height
Max Displacement
X (inch) Y (inch)
R 72 14 1.456 1.019
5 58 14 1.232 0.855
4 44 14 0.957 0.67
3 30 14 0.641 0.438
2 16 16 0.304 0.209
Story Drift
Seismic Story Drift LimitX (inch) Y (inch)
0.672 0.164 3.36
0.825 0.185 3.36
0.948 0.232 3.36
1.011 0.229 3.36
0.912 0.209 3.84
Drift and Torsion
PRESENTATION OUTLINE
1. EXISTING CONDITIONS
2. DEPTH STUDY
3. BREADTH STUDY
4. CONCLUSION & RECOMMENDATION
David LeeStructural OptionURS – Arena District Office Building
DEPTH STUDY 1
OBJECTIVES
• Eliminate Moment Frames• Reduce Floor Depth
David LeeStructural OptionURS – Arena District Office Building
CONSTRAINTS
• North and West façade must be free of obstruction• Large open floor space must be maintained
Objectives and Constraints
Design:• Removed both moment frames • Added a braced frame
Result:• Reduced eccentricity
David LeeStructural OptionURS – Arena District Office Building Steel Alternative
DEPTH STUDY 2
Steel Member Size
New steel frame identical to braced frame 1
David LeeStructural OptionURS – Arena District Office Building
DEPTH STUDY 3
Steel Alternative
David LeeStructural OptionURS – Arena District Office Building
DEPTH STUDY 4
Steel Alternative
Constraint Met & Design Goal Achieved
David LeeStructural OptionURS – Arena District Office Building
DEPTH STUDY 5
Steel Alternative
Drift and Story Drift
Calculated Maximum Drift L/780
*due to wind
X (inch) Y (inch) X (inch) Y (inch)R 72 14 1.004 1.101 2.16 0.519 0.184 0.425 58 14 0.831 0.917 1.74 0.687 0.201 0.424 44 14 0.602 0.716 1.32 0.657 0.251 0.423 30 14 0.383 0.465 0.9 0.645 0.243 0.422 16 16 0.168 0.222 0.48 0.504 0.222 0.48
H/400 Drift
Story Drift H/400 Story DriftFloor
Height (feet)
Floor to Floor
HeightMax Displacement
David LeeStructural OptionURS – Arena District Office Building
DEPTH STUDY 6
Concrete Alternative
Concrete Design
•Flat plate 2 way PT slab
•CIP columns
•Shearwalls
David LeeStructural OptionURS – Arena District Office Building
DEPTH STUDY 7
Concrete Alternative
Recalculate Loads•Self weight of building increase from 52 PSF to 106 PSF
•Seismic lateral load controls in both X and Y direction LOAD TYPE
Factored Load In X direction
Factored Load In Y direction
WIND 143 kip 281 kipSEISMIC 323 kip 323 kip
8.5” concrete slab with density of
150PCF = 106PSF
David LeeStructural OptionURS – Arena District Office Building
DEPTH STUDY 8
Concrete Alternative
PT Slab Design
•Feasibility domain created to obtain possible force, eccentricity combination•Steel envelop developed after tendon force is determined
Y
X
David LeeStructural OptionURS – Arena District Office Building
DEPTH STUDY 9
Concrete Alternative
Max initial deflection = 0.1”
Max sustained deflection = 0.46”
Max long term deflection = 1.58”
Limit Floor Deflection
L = l/360D+L = l/240
David LeeStructural OptionURS – Arena District Office Building
DEPTH STUDY 10
Concrete Alternative
CIP Column•Perform gravity design•Consider slenderness effects•Check punching shear
Interaction Diagram
0
500
1000
1500
2000
2500
0 100 200 300 400 500 600 700
Moment (ft-k)
Fo
rce
(k)
David LeeStructural OptionURS – Arena District Office Building
DEPTH STUDY 11
Concrete Alternative
Shearwalls•Coincide with elevator shaft and stairwell•Max Drift = l/1000
Foundation•Larger footings needed•Existing foundations require 350CY of concrete•Concrete design require 1000CY of concrete for foundation
PRESENTATION OUTLINE
1. EXISTING CONDITIONS
2. DEPTH STUDY
3. BREADTH STUDY
4. CONCLUSION & RECOMMENDATION
David LeeStructural OptionURS – Arena District Office Building
David LeeStructural OptionURS – Arena District Office Building
BREADTH STUDY 1
Cost and Schedule
Considerations•Cost
•Construction Duration
•Constructability
RS MEANS Steel Concrete
Cost ($/SF) 15.58 16.80
Duration (days) 27 53
PRESENTATION OUTLINE
1. EXISTING CONDITIONS
2. DEPTH STUDY
3. BREADTH STUDY
4. CONCLUSION & RECOMMENDATION
David LeeStructural OptionURS – Arena District Office Building
David LeeStructural OptionURS – Arena District Office Building
CONCLUSION & RECOMMENDATION
Recommendation
Steel•Construction cost savings of $122,000•Shorter construction duration•Majority of office building in Columbus use steel frame
Concrete•Cost savings due to reduced floor depth•Flexibility in on-site alterations•No lead time
ACKNOWLEDGEMENTSURS Corporation
Bill Huckleberry, Structural Engineer
ONCORE ConstructionRaymond E. Sowers
AE FacultyProfessor Andres Lepage
Professor M. Kevin Parfitt Professor Jelena SrebricProfessor John MessnerRest of the AE Faculty
AE StudentsSean Flynn
Brian Ault
ANDAll my family and friendsDavid Lee
Structural OptionURS – Arena District Office Building
QUESTIONS ?