building background building structural system problem statement proposed solution structural...
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion. Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations - PowerPoint PPT PresentationTRANSCRIPT
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Client: Arizona State University New 20-story apartment building Overall height: 208 ft Total area: 260,000 ft2
Estimated total cost: $37.5 million Projected construction time: 177 days (9 months)
Building BackgroundSite Map
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Modular Uses prefabricated assemblies Slip-formed concrete cores No columns Erected using Lift Slab Construction
- L’Ambiance Plaza, 1987
Building BackgroundTypical Floor PlanUnique Features
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Modular Uses prefabricated assemblies Slip-formed concrete cores No columns Erected using Lift Slab Construction
- L’Ambiance Plaza, 1987
Building BackgroundLift-Slab ConstructionUnique Features
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Mat Foundation- Soil conditions
Floor System- Structural steel framing- 3” metal deck- 3-1/4” lightweight concrete topping
Building Structural SystemStructural Framing Plan
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Gravity and Lateral systemGravity:
Lateral:Vbase = 235k
Vwind = 565k
Maximum drift = 2.74 in (h/400 = 6.24 in)
Building Structural System(3) 25’ x 25’ Concrete Cores
Load Type Load Value (psf)Construction Dead Load 59
Superimposed Dead Load 15Live Load 80
Façade Load 15Snow Load 0
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
How versatile is this construction method?
Problem Statement
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
How versatile is this construction method?
How easily could it be redesigned for higher seismic loads?• How would the connection of the floor system to the core
need to change?
Problem Statement
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
How versatile is this construction method?
How easily could it be redesigned for higher seismic loads?• How would the connection of the floor system to the core
need to change? How does the construction cost fluctuate for more extreme
loading conditions?
Problem Statement
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
How versatile is this construction method?
How easily could it be redesigned for higher seismic loads?• How would the connection of the floor system to the core
need to change? How does the construction cost fluctuate for more extreme
loading conditions? What effect would the redesign have on the floor plan?
Problem Statement
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
How versatile is this construction method?
How easily could it be redesigned for higher seismic loads?• How would the connection of the floor system to the core
need to change? How does the construction cost fluctuate for more extreme
loading conditions? What effect would the redesign have on the floor plan? How easily can this type of building attain a LEED
Certification in a cost-effective way?
Problem Statement
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Relocate to SDC D• St Louis, Missour i
Invest igate ways to transfer diaphragm shear to the cores
Cost analys is Architectural evaluat ion Sustainabi l i ty study
Proposed SolutionCore Openings in the Original Design
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
New design loads:
Special re inforced concrete shear wal ls Assumption: no extreme torsional
i rregular i ty (ASCE 7-05, 12.2.5.4)
C s , n e w = 0.027
W b l d g , n e w = 24,349 kips
Trial sizing: 12” , 16” and 18” walls• Used 16” walls for building weight
Shear check: tmin = 9.26 in
Structural Investigations
Gravity LoadsConstruction Dead Load 59 psf
Superimposed Dead Load 15 psfLive Load 80 psf
Façade Load 15 psfSnow Load 20 psf
Base Shear 1001.4 kips
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Tr ial wal l th ickness = 16” Minimum shear re inforcement• V c = 2678k >> V b a s e = 1001k
Minimum moment re inforcement Boundary elements Maximum compressive stress = 0.253f’ c
Reinforcement details:
Structural InvestigationsCore Design
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Tr ial wal l th ickness = 16” Minimum shear re inforcement• V c = 2678k >> V b a s e = 1001k
Minimum moment re inforcement Boundary elements Maximum compressive stress = 0.253f’ c
Reinforcement details:
Structural InvestigationsCore Design
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Coupl ing beams• Shear from ETABS model :
Vm a x , m o d e l ( 3 r d fl o o r ) = 130.7 kips
V c o u p l i n g b e a m d e s i g n =158 kips
Reinforcement details:
Structural InvestigationsCore Design
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Model ing• 3 models (d ifferent core layouts)
- Original design
- Opt ion 1(minimal openings)- Opt ion 2 (consol idated openings)
Structural InvestigationsCore Design Core Shapes
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Model ing• 3 models (d ifferent core layouts)
- Or iginal design- Option 1(minimal openings)
- Opt ion 2 (consol idated openings)
Structural InvestigationsCore Design Core Shapes
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Model ing• 3 models (d ifferent core layouts)
- Or iginal design- Opt ion 1(minimal openings)- Option 2 (consolidated
openings)
Structural InvestigationsCore Design Core Shapes
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Model ing• 3 models (d ifferent core layouts)
- Or iginal design- Opt ion 1(minimal openings)- Opt ion 2 (consol idated openings)
Structural InvestigationsCore Design ETABS Outputs
Design Original Option 1 Option 2Max Deflection (in.) 6.126 6.126 9.737Min Deflection (in.) -0.455 -0.888 -2.555
Mode 1 (sec) 3.943 2.167 2.783Mode 2 (sec) 3.521 2.025 2.486Mode 3 (sec) 3.319 1.797 2.332
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Focus: floor-to -core connect ion• Shear t ransfer
Complexity• Coupl ing beams• Boundary elements• Construct ion method
2 potential designs:• “Steel Collar” Design
Shear goes directly from diaphragm to core via shear studs embedded in the core
• “Drag Strut” DesignThe beams running along each core act
as collector elements, shear transfer is from beams to core via welds on elements embedded in core
Structural InvestigationsFloor System Design
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2 potential designs:• “Steel Collar” Design
Shear goes directly from diaphragm to core via shear studs embedded in the core
• “Drag Strut” DesignThe beams running along each core act
as collector elements, shear transfer is from beams to core via welds on elements embedded in core
Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Structural InvestigationsFloor System Design
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2 potential designs:• “Steel Collar” Design
Shear goes directly from diaphragm to core via shear studs embedded in the core
• “Drag Strut” Design
The beams running along each core act as collector elements, shear transfer is from beams to core via welds on elements embedded in core
Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Structural InvestigationsFloor System Design
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Used bare mater ia l costs for evaluat ion
About the same for both opt ions Addit ional 8% of total construct ion cost
Structural InvestigationsCost Evaluation
Bare Material CostsItem Original Design Option 1 Option 2
Concrete 113373 247340 216553Reinforcement 74385 381027 432258
Welds 0 1080 1080Shear Studs 0 70553.6 6364.8Other Steel 0 2069809.2 2069809.2
Total ($) 187757 2769810 2726064Difference from Original 0 2582053 2538307
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Advantages• Easy access to cores• Regular• Modular
Disadvantages• Numerous core penetrat ions
Patterns• Bathrooms l ine the corr idor
Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Architectural ImpactOriginal Design
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Advantages• Easy access to cores• Regular• Modular
Disadvantages• Numerous core penetrat ions
Patterns• Bathrooms l ine the corr idor
Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Architectural ImpactOriginal Design
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Advantages• No core penetrat ions• More usable area
Disadvantages• Not as regular• Bathrooms are not as stacked
Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Architectural ImpactOption 1
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Advantages• Easy access to cores• Modular• More usable area• Bathrooms are more stacked
Disadvantages• Core penetrat ions
Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Architectural ImpactOption 2
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Attain a minimum of LEED Cert ified status with minimal , i f any, cost investment
• LEED Cert ified status requires a minimum of 40 points
Sustainability StudyGoal
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Current design = 20 points
Addit ional easi ly attainable points = 21• 3 of the 21 credits require money
- She l te red b i ke racks f o r 15% o f res iden ts
- Landscap ing to p ro tec t , re s to re and shade the s i te
Sustainability StudyLEED Point Evaluation
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
• Bike racks (1 credit)Est imated cost at about $70/ft 2
Est imated area needed = 450 ft 2
• Total cost = $35,000 (0 .1% o f to ta l bu i ld ing cos t )
Current design = 20 points
Addit ional easi ly attainable points = 21• 3 of the 21 credits require money
- Shel tered b ike racks for 15% of res idents
- Landscap ing to p ro tec t , re s to re and shade the s i te
Sustainability StudyLEED Point Evaluation
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
• Landscaping (2 credits)• Total cost = $200,000
(0 .5% o f to ta l bu i ld ing cos t )
Total est imated cost for 3 credits: $235,000 ( 0 .6% o f t o ta l bu i ld ing cos t )
Current design = 20 points
Addit ional easi ly attainable points = 21• 3 of the 21 credits require money
- She l te red b i ke racks fo r 15% o f res iden ts
- Landscap ing to protect , restore and shade the s i te
Sustainability StudyLEED Point Evaluation
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
8% more expensive (bare material) in SDC D Complicated connections Viability:• None. Extreme torsional irregularity.
Torsional amplification factor ≈ 2.5 for Option 1Peer review?
• Architecturally viable
Can easily attain LEED Certified• Requires:
Initial time investment during preconstructionMonetary investment of 0.5 - 0.6% of total cost
ConclusionStructural, Architectural, Cost Sustainability
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
Thank You!
Questions or Comments?
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
AppendixCore Corner Details
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
AppendixMasses Modeled in ETABS
Model MassesRoof 1.73E- 06 k- sec2/ in2
Typical Floor 2.57E- 06 k- sec2/ in2First Floor 3.16E- 06 k- sec2/ in2
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
AppendixSteel Collar Design
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
AppendixSteel Collar Design
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
AppendixDrag Strut Design
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Building Background Building Structural System Problem Statement Proposed Solution Structural Investigations Architectural Impact Sustainability Study Conclusion
AppendixDrag Strut Design