4/14/2010 1 Columbia University Northwest Science Building New York, NY • EXISTING • THESIS PROPOSAL • GOALS • EXISTING LATERAL • LATERAL REDESIGN • BUILDING ENCLOSURE Jonathan R.Torch Structural Option B.A.E/M.A.E Candidate Faculty Advisor: Dr. Ali Memari • ARCHITECTURE • CONCLUSION Slide 1
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THESIS PRES TORCH - engr.psu.edu€¦ · 4/14/2010 1 Columbia University Northwest Science Building New York ,NY •EXISTING •THESIS PROPOSAL •GOALS •EXISTING LATERAL •LATERAL
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• Lateral System Contains the following:o Horizontal HSS Shaped Girt Memberso Concentric Braced Frames (Wide Flanges)
• ARCHITECTURE• CONCLUSION
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Thesis Proposal Relocation of Building – New York, NY to Miami, FL
Structural Depth• Calculation of Wind Forces for Miami, FL
EXISTING•THESIS PROPOSAL• GOALS• EXISTING LATERAL• LATERAL REDESIGN• BUILDING ENCLOSURE
New York, NYDesignWind Speed 110 MPH
• Analyze Existing Lateral System for Miami, FL• Redesign and Analyze Lateral System
Building Enclosure Breadth• Perform R-value, Condensation, and Air Leakage Analyses• Modify Curtain Wall for Miami, FL
• ARCHITECTURE• CONCLUSION Miami, FL
DesignWind Speed 150 MPH
Architectural Breadth• Research Miami, FL Architecture• Redesign Exterior Architecture for Miami, FL
Slide 5
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Goals – Based on Relocation of Building to Miami, FL
Thesis – Goals
• Redesign building’s lateral system to meet code requirements.• Provide analysis of lateral system through means of ETABS and
hand calculations.• Research, analyze, and modify building enclosure appropriately for
water condensation and heat transmission concerns.• Redesign exterior architecture of building.
EXISTINGTHESIS PROPOSAL
• GOALS• EXISTING LATERAL• LATERAL REDESIGN• BUILDING ENCLOSURE• ARCHITECTURE• CONCLUSION
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Determination of Wind Forces for Miami, FL
5000
6000
Comparison of Base Shears (NYC vs. Miami)Wind East-West DirectionMiami, FL
Wind North-South DirectionMiami, FL
EXISTINGTHESIS PROPOSALGOALS
• EXISTING LATERAL• LATERAL REDESIGN• BUILDING ENCLOSURE
New York, NY
Miami, FL
0
1000
2000
3000
4000
North‐SouthEast‐West
Base She
ar (K
IPS)
• ARCHITECTURE• CONCLUSION
North‐South East‐West
New York, NY 982 2860
Miami, FL 1400 5490
• Determine Wind Forces using ASCE 7-05 Method 2 – Analytical Procedure.• Base Shear Increased by 2600 kips (East-West Direction)• Base Shear Increased by 418 kips (North-South Direction)
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Existing Lateral Analysis for Miami, FLWind Case 1
• Main Wind Force Resisting System – Method 2 – Design Wind Load Cases Used
• Governing Wind Case Determined for Each Frame
EXISTINGTHESIS PROPOSALGOALS
• EXISTING LATERAL• LATERAL REDESIGN• BUILDING ENCLOSURE
Wind Case 2
Wind Case 3Miami, FL
2
4
6
8
10
12
14
16
1.65
6.32.16
14.09
Inches
Comparison of Max Wind Drifts ‐ NYC vs. Miami
• ARCHITECTURE• CONCLUSION
Wind Case 4
Wind Case Forces Calculated & Inputted into ETABS Software – Analyzed
• Existing Lateral System Failed Most Drift, Story Drift, & Strength Checks• System Acceptable for Overturning Moment Calculations
Allowable Drift H/400 = 6.78 in.
New York, NY0
North‐SouthEast‐West
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My Lateral Redesign for Miami, FL
Strength Requirements Checked for Bracing & Columns:• Available Compressive Strength (ΦcPn)• Local Buckling
East-West Direction Lateral Redesign - Critical
W14X53
Chevron Bracing
EXISTINGTHESIS PROPOSALGOALSEXISTING LATERAL
• LATERAL REDESIGN• BUILDING ENCLOSURE
• Effective Length and Bracing Slenderness• Available Strength in Axial Tension (ΦtPn)
Strength Requirements Checked for Participating Beam Members:• Available Compressive Strength (ΦcPn)• Available Strength in Axial Tension (ΦtPn)• Shear Capacity/Transfer at Joints
• North-South Direction Lateral System Redesign• Not as critical as East-West Direction• Larger member sections provided where needed. (small occurrence)
• 184,000,000 BTUs/Year Difference (New York, NY Greater Energy Loss)• Equivalent too burning approximately 200,000 gallons of natural gas.• Analysis supports reduction in insulation layer for Miami, FL.
Bare Material Cost Analysis – (RS Means)• $185,900 bare material cost savings due to reduction in insulation layer. 2.00E+08
2.50E+08
3.00E+08
Air Leakage Analysis Comparison Miami, FL vs. New York, NY (BTUs/Year)
o Mediterranean Revivalo Art Decoo Streamline Modern
3D North-East Image
• ARCHITECTURE• CONCLUSION
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Senior Thesis Conclusions
Lateral System Redesign for Miami, FL Winds• Miami Wind Force Calculations
Proposed Goals:
• ETABS Model Assistance• Drift, Story Drift, Strength, and Overturning Moment Checks• $205,000 Steel Bare Material Additional Cost
Building Enclosure Modified for Miami, FL Climate• Reduction in Insulation Layer (4” to 2.5”) • $185 900 Bare Material Cost Savings
Redesign building’s lateral system to meet code requirements.Provide analysis of lateral system through means of ETABS and hand calculations.Research, analyze, and modify building enclosure appropriately for water condensation and heat transmission concerns.Redesign exterior architecture of building.
EXISTINGTHESIS PROPOSALGOALSEXISTING LATERALLATERAL REDESIGNBUILDING ENCLOSURE $185,900 Bare Material Cost Savings
Exterior Architecture Redesign for Miami, FL• Includes Elements of Mediterranean Revival, Art Deco, &