Coppin State University

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BRYAN DARRIN SENIOR THESIS PRESENTATION MILLEN
NIUM HALL DREXEL CAMPUS PHILADELPHIA, PA
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Millennium Hall 34th Street and Race Street,
Philadelphia, PA 19104 Drexel University Educati
onal Residence Hall 153,000 Gross S.F. 17
Stories Total
Introduction - General Building
Information - Existing Structural System -
Thesis Objective - Structural Depth -
Architectural Breadth - CM Breadth - Final
Summary/Conclusions
General Building Information
Façade of glass and aluminum screen curtain
wall Offset of each floor as a rotation about
the central core creates spiral affect. Note
For this entire thesis project, the spiral affect
has been removed. This includes all data referred
to as existing design.
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Introduction - General Building
Information - Existing Structural System -
Thesis Objective - Structural Depth -
Architectural Breadth - CM Breadth - Final
Summary/Conclusions
Cast-in-place concrete Flat plate Concrete
moment frame with concrete shear walls

• 110 feet wide
• feet deep
• 15 foot cantilever

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- Introduction Thesis Objective - Problem
Statement/Solution - Thesis Goals - Structural
Depth - Architectural Breadth - CM Breadth -
Final Summary/Conclusions
Thesis Redesign Goals Depth - Structural 1.
Reduce the weight of the overall building by
replacing the gravity system 2. Minimize
drift with a lateral force resisting system in
coordination with the gravity system 3. Verify
the impact on the foundation system
Existing Building Problems Heavy weight due to
concrete Thick floor slabs due to large
cantilever
Redesign Solution Design as steel moment
frame Use composite deck to reduce
thickness Move column line to exterior Add
braced frames for lateral resistance
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- Introduction Thesis Objective - Problem
Statement/Solution - Thesis Goals - Structural
Depth - Architectural Breadth - CM Breadth -
Final Summary/Conclusions
Thesis Redesign Goals Breadth 2
Construction Management 5. Determine the
impact that the redesign has on the construction
schedule and cost of the building
Thesis Redesign Goals Breadth 1 -
Architectural 4. Determine the impact on the
architectural design including floor plan
layout
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- Introduction - Thesis Objective Structural
Depth - Gravity Redesign - Lateral Redesign -
Foundation Check - Architectural Breadth - CM
Breadth - Final Summary/Conclusions
SDL 20 psf 15 psf 35 psf LL 100 psf 1.2
SDL 1.6 LL
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- Introduction - Thesis Objective Structural
Depth - Gravity Redesign - Lateral Redesign -
Foundation Check - Architectural Breadth - CM
Breadth - Final Summary/Conclusions
L 35 100 135 psf gt 147 psf ok
Wu 1.2(44535) 1.6(100)(12)/1000 3.13
klf
Mu 452 ft-kips
Use W16x45 with 32 studs spaced at 12 inches
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- Introduction - Thesis Objective Structural
Depth - Gravity Redesign - Lateral Redesign -
Foundation Check - Architectural Breadth - CM
Breadth - Final Summary/Conclusions
Ram Model Used to verify hand calculations and
determine column sizes Full composite
construction was assumed Same loading was used
Results 1 RAM member sizes were found to be
close to the hand calculated but generally
smaller.
Results 2 Preliminary column sizes were
found W10x33 Typ. As large as W10x100 at
interior line
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- Introduction - Thesis Objective Structural
Depth - Gravity Redesign - Lateral Redesign -
Foundation Check - Architectural Breadth - CM
Breadth - Final Summary/Conclusions
Design Limits (IBC,2006) (Allowable Building
Drift) ?wind H/400 18012/400 5.4
inches
Design Loads Wind controls in the North/South
direction 398 kips
(Allowable Story Drift) ?seismic 0.015Hsx
0.0151012 1.8 inches
Seismic controls in the East/West direction
327 kips
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- Introduction - Thesis Objective Structural
Depth - Gravity Redesign - Lateral Redesign -
Foundation Check - Architectural Breadth - CM
Breadth - Final Summary/Conclusions
First Evaluation
ETABS Design Process Model was built in
ETABS Member sizes from Gravity system were
used Columns were aligned with local beam
axis All connections were assigned as moment
connection Diaphragm was assigned to each
floor Loading patterns for seismic and wind
were placed as individual story forces
Total Drift gt 30 inches Larger member sizes were
not making much improvement
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- Introduction - Thesis Objective Structural
Depth - Gravity Redesign - Lateral Redesign -
Foundation Check - Architectural Breadth - CM
Breadth - Final Summary/Conclusions
Second Evaluation
North/South Wind
Braced frames added to resist North/South drift
Maximum drift 5.33 inches lt 5.4 inches
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- Introduction - Thesis Objective Structural
Depth - Gravity Redesign - Lateral Redesign -
Foundation Check - Architectural Breadth - CM
Breadth - Final Summary/Conclusions
East/West Seismic
Foundation Check
20 caissons Assume equal distribution 920 kips
/ caisson
32 caissons Assume interior 10 caissons take
half 680 kips / caisson
Maximum story drift 1.22 inches lt 1.8 inches
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- Introduction - Thesis Objective - Structural
Depth Architectural Breadth - CM Breadth -
Final Summary/Conclusions
Connected directly to column Connection points
every 12 feet Continuously up building
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- Introduction - Thesis Objective - Structural
Depth - Architectural Breadth CM Breadth -
Final Summary/Conclusions
Cost/Schedule Comparison Cost has been
increased by 600,000 or by 35 Schedule has
been reduced by 200 days or by40
Existing Cost/Schedule Includes structural
concrete, reinforcement, and framing Estimated
structural cost of 1.7 million Estimated
timeline of 330 days
New Cost/Schedule Includes steel framing, steel
decking, metal studs to develop composite
strength, concrete, reinforcement, and fire
proofing Estimated structural cost of 2.3
million Estimated timeline of 130 days
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- Introduction - Thesis Objective - Structural
Depth - Architectural Breadth - CM Breadth
Final Summary/Conclusions
Goals Re-evaluated
Summary
1. Reduce the weight of the overall building by
replacing the gravity system
Steel frame and composite deck provide
lightweight system
2. Minimize drift with a lateral force resisting
system in coordination with the gravity system
Steel braced frames partnered with steel moment
frame reduce drifts to allowable values
3. Verify the impact on the foundation system
Existing caissons have adequate strength for all
columns, most could be reduced in size
4. Determine the impact on the architectural
design including floor plan layout
Minimal façade connection changes and layout
adjustments have little impact on floor plan
5. Determine the impact that the redesign has on
the construction schedule and cost of the building
Structural cost has gone up but entire building
schedule time has been reduced
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- Introduction - Thesis Objective - Structural
Depth - Architectural Breadth - CM Breadth
Final Summary/Conclusions
Acknowledgements
Summary
I would like to thank The Harman Group for a
unique building idea Drexel University for
allowing me to analyze the Millennium Hall
building The entire AE faculty, especially my
Thesis Advisor Dr. Hanagan
Met project goals Structural design is feasible
option
QUESTIONS?