american eagle outfitters quantum ii corporate headquarters michael sandretto spring – 2007...
TRANSCRIPT
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AMERICAN EAGLE OUTFITTERSQuantum II Corporate Headquarters
Michael SandrettoSpring – 2007
Structural Option
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Presentation Outline
• Building Description & Background
• Problem Statement & Proposed Solution
• Depth Study– Cross Braced Lateral System
• Breadth Study– Cost Analysis & Scheduling– Alternative Floor System
• Conclusions
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Location & HistoryThe Old South Side Works
• One of many steel manufacturing facilities that made the region an industrial power.
• 2 ½ miles outside the city on the south shore of the Monongahela River.
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Location & HistoryThe New South Side Works
• Opened in 2002• 34 acre, multi-million dollar
commercial development• Includes: retail, dining, offices, cinema, parking,
& apartments.
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Quantum II
• 6 story 186,000 square foot office.
• Purchased by American Eagle Outfitters
• Currently in tenant fit-out.
• $22.4 million
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Project Team
• Developer: Soffer Development• Owner: American Eagle Outfitters• Base Building Architect: Davis Gardner
Gannon Pope• Base Building Engineer: Watson Engineers• Fit-out Architect: The Design Alliance• Fit-out Engineer: Atlantic Engineering
Services• Fit-out MEP: Tower Engineering
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Building Systems
Mechanical• CAV System• 18000 CFM Roof Top Unit• 7200 CFM Roof Top Unit
Lighting / Electrical• 480/277V, 3 Phase, 4 Wire Primary System• 208/120V, 3 Phase, 4 Wire Secondary System
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Structural System
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Gravity System
• Composite floor deck: 3” 4 ksi concrete over 3” 20 gauge metal deck
• ¾” diameter 4 ½” long shear studs
• 50 ksi steel members
• 3 rows of 30’x30’ bays
• 1 row of 38’x30’ bays
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Gravity System
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Lateral System
Moment framing plan
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Foundation
• 45’ concrete piles• 3 ksi concrete with 60 ksi reinforcing steel• Grade beams surround building perimeter
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Problem Statement
• Designed for maximum fit-out adaptability
• Lateral system unobtrusive to floor plan
• Required extensive moment frame system
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Proposed Solution
• Replace existing lateral system
• Employ diagonal steel cross bracing
• Utilize final architectural plans to retro-fit structure with cross bracing without obstructing floor plan
• Design assisted by RAM Steel
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Depth Study:Lateral Cross Bracing
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New Frame Layout:
First Floor
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New Frame Layout:
Typical Floor
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New Frame Layout:
Sixth Floor
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New Frame Layout:
3D View
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Loads: Gravity
Dead Loads• Typical Floor Slab• Roof Slab• Exterior Curtin Wall• MEP• Miscellaneous
Live Loads• Roof• All Floors• Stairs• Balconies• Flat Roof Snow
57 psf
57 psf
20 psf
10 psf
5 psf
30 psf
100 psf
100 psf
100 psf
21 psf
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Loads: Lateral
Wind Force Diagram Seismic Force Diagram
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Gravity
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Lateral
• Square HSS shapes used in bracing
• Sized to withstand wind & seismic
• Drift kept within = L/400– 2.52”
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Lateral
Frame 1 Frame 2
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Lateral
Frame 3 Frame 4 Frame 5
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Breadth:Cost Analysis & Scheduling
Alternative Floor
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Breadth: Cost Analysis
• Cost data taken from RS Means
Existing System Redesigned System
Typical Floor (x5) $ 351,851 Typical Floor (x5) $ 265,690
Roof $ 298,701 Roof $ 207,827
Columns $ 360,112 Columns $ 238,602
Total $ 2,418,068 Bracing $ 168,848
Total $ 1,943,727
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Breadth: Construction Schedule
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Breadth: Alternative Floor• 8” Hollow Core Concrete Planks
• Longer span capability – reduces beams
• Self weight = 57 psf – minimal impact on slab weight & seismic loads
• Unable to utilize composite framing
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Breadth: Alternative Floor
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Conclusions
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?