URS – ARENA DISTRICT
OFFICE BUILDING
DAVID LEE
STRUCTURAL
OPTION
PRESENTATION OUTLINE
1. EXISTING CONDITIONS
2. DEPTH STUDY
3. BREADTH STUDY
4. CONCLUSION & RECOMMENDATION
David Lee
Structural Option
URS – Arena District Office Building
PRESENTATION OUTLINE
1. EXISTING CONDITIONS
2. DEPTH STUDY
3. BREADTH STUDY
4. CONCLUSION & RECOMMENDATION
David Lee
Structural Option
URS – 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 Lee
Structural Option
URS – Arena District Office Building
Building Statistics
EXISTING CONDITIONS
2
OHIO BASIC BUILDING CODE 1998
STRUCTURAL
STEEL
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
MASONRY
David Lee
Structural Option
URS – Arena District Office Building
AISC Manual of Steel Construction
AISI – “Specification for the Design of
Cold-formed Steel Structural Members”
SDI – “Design Manual for Composite
Decks, Form Deck, and Roof Decks”
ACI 530.1/ASCE 6/TMS 602
Table 1
Building Code
EXISTING CONDITIONS
David Lee
Structural Option
URS – Arena District Office Building
3
Typical Floor Framing
EXISTING CONDITIONS
4
Y
X
Lateral Load
Direction
Factored
Base Shear
Due to
WIND
Factored
Base Shear
Due to
SEISMIC
North-South
Loading
Considered Y
281.38 kip
169.30 kips
East-West Loading
Considered X
142.8 kips
169.30 kips
David Lee
Structural Option
URS – Arena District Office Building
Existing Lateral System
EXISTING CONDITIONS
5
X (inch)
Y (inch)
Seismic
Story
Drift
Limit
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
Story Drift
Center of Mass
Center of Rigidity
Height
(feet)
Floor to
Floor
Height
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
Floor
David Lee
Structural Option
URS – Arena District Office Building
Max Displacement
Drift and Torsion
PRESENTATION OUTLINE
1. EXISTING CONDITIONS
2. DEPTH STUDY
3. BREADTH STUDY
4. CONCLUSION & RECOMMENDATION
David Lee
Structural Option
URS – Arena District Office Building
DEPTH STUDY
1
OBJECTIVES
• Eliminate Moment Frames
• Reduce Floor Depth
CONSTRAINTS
• North and West façade must be
free of obstruction
• Large open floor space must be maintained
David Lee
Structural Option
URS – Arena District Office Building
Objectives and Constraints
DEPTH STUDY
2
Design:
• Removed both moment frames
• Added a braced frame
Result:
• Reduced eccentricity
David Lee
Structural Option
URS – Arena District Office Building
Steel Alternative
DEPTH STUDY
3
Steel Member Size
New steel frame identical to
braced frame 1
David Lee
Structural Option
URS – Arena District Office Building
Steel Alternative
DEPTH STUDY
4
Constraint Met & Design Goal Achieved
David Lee
Structural Option
URS – Arena District Office Building
Steel Alternative
DEPTH STUDY
5
Drift and Story Drift
Floor
R
5
4
3
2
Height
(feet)
72
58
44
30
16
Floor to
Floor
Height
14
14
14
14
16
Max Displacement
X (inch)
Y (inch)
1.004
1.101
0.831
0.917
0.602
0.716
0.383
0.465
0.168
0.222
H/400
Drift
2.16
1.74
1.32
0.9
0.48
Story Drift
X (inch)
Y (inch)
0.519
0.184
0.687
0.201
0.657
0.251
0.645
0.243
0.504
0.222
H/400
Story Drift
0.42
0.42
0.42
0.42
0.48
Calculated Maximum Drift L/780
*due to wind
David Lee
Structural Option
URS – Arena District Office Building
Steel Alternative
DEPTH STUDY
6
Concrete Design
•Flat plate 2 way PT slab
•CIP columns
•Shearwalls
David Lee
Structural Option
URS – Arena District Office Building
Concrete Alternative
DEPTH STUDY
7
Recalculate Loads
•Self weight of building increase from
52 PSF to 106 PSF
•Seismic lateral load controls
in both X and Y direction
David Lee
Structural Option
URS – Arena District Office Building
8.5” concrete slab
with density of
150PCF = 106PSF
LOAD TYPE
WIND
SEISMIC
Factored
Load In X
direction
Factored
Load In Y
direction
143 kip
323 kip
281 kip
323 kip
Concrete Alternative
DEPTH STUDY
8
PT Slab Design
•Feasibility domain created
to obtain possible force,
eccentricity combination
•Steel envelop developed after
tendon force is determined
David Lee
Structural Option
URS – Arena District Office Building
Y
X
Concrete Alternative
DEPTH STUDY
Limit Floor Deflection
9
L = l/360
D+L = l/240
Max initial deflection = 0.1”
Max sustained 
deflection = 0.46”
Max long term deflection = 1.58” 
David Lee
Structural Option
URS – Arena District Office Building
Concrete Alternative
DEPTH STUDY
10
Interaction Diagram
CIP Column
2500
•Perform gravity design
•Consider slenderness effects
•Check punching shear
Force (k)
2000
1500
1000
500
0
0
100
200
300
400
500
600
700
Moment (ft-k)
David Lee
Structural Option
URS – Arena District Office Building
Concrete Alternative
DEPTH STUDY
11
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
David Lee
Structural Option
URS – Arena District Office Building
Concrete Alternative
PRESENTATION OUTLINE
1. EXISTING CONDITIONS
2. DEPTH STUDY
3. BREADTH STUDY
4. CONCLUSION & RECOMMENDATION
David Lee
Structural Option
URS – Arena District Office Building
BREADTH STUDY
1
Considerations
•Cost
•Construction Duration
•Constructability
David Lee
Structural Option
URS – Arena District Office Building
RS MEANS
Steel
Concrete
Cost ($/SF)
15.58
16.80
Duration (days)
27
53
Cost and Schedule
PRESENTATION OUTLINE
1. EXISTING CONDITIONS
2. DEPTH STUDY
3. BREADTH STUDY
4. CONCLUSION & RECOMMENDATION
David Lee
Structural Option
URS – Arena District Office Building
CONCLUSION & RECOMMENDATION
Steel
Concrete
•Construction cost savings of
$122,000
•Shorter construction duration
•Majority of office building in
Columbus use steel frame
•Cost savings due to reduced floor
depth
•Flexibility in on-site alterations
•No lead time
David Lee
Structural Option
URS – Arena District Office Building
Recommendation
ACKNOWLEDGEMENTS
URS Corporation
Bill Huckleberry, Structural Engineer
ONCORE Construction
Raymond E. Sowers
AE Faculty
Professor Andres Lepage
Professor M. Kevin Parfitt
Professor Jelena Srebric
Professor John Messner
Rest of the AE Faculty
AE Students
Sean Flynn
Brian Ault
AND
David Lee
All my family and friends
Structural Option
URS – Arena District Office Building
QUESTIONS ?