Agricultural Hall and Annex Easting Lansing, MI Ismail Al-Hadhrami AE – Structural Option

Presentation Outline (1) Existing Building Background (2) Structural Systems - Gravity System - Lateral System (3) Proposed Thesis (4) Structural Design (5) Construction Management (6) Conclusion Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option Project Team (1) Owner - Michigan State University (2) Architect - SmithGroup (3) Structural Engineer (6) Project Manager (5) MEP Engineer Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Building Location Michigan State University Campus Existing Building Agricultural Hall and Annex North Kedzie Hall www.msu.edu Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Building Information Designed to be five-story with penthouse Three floors have been built 1000 SQ FT/Floor Use – office building Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Structural Systems Gravity System - Cast-in-place one-way Columns joist - 30” and 20” clear spans - Joist depth = 16” deep + 4.5” slab - Girders depth = 27.5” Columns - 24” x 24” Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Structural System Lateral System - Seismic Loads govern - Concrete Moment Frames Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Proposal Building Design Codes Comparison US Standards vs. British Standards Focus - Gravity Loads - Loads Combinations - Wind Design Procedures Gravity Systems (US Standards) - Wide-Module One-way Joist System - Flat Slab - Composite Steel with Composite Deck - East Lansing, MI Gravity Systems (British Systems) - Two-way Slab with Interior Beams - Muscat, Oman Lateral System - Concrete moment frames for concrete structures - Moment frames and braced frames for steel structure Cost and Time Comparison Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Design Codes US - ACI 318-02 - IBC 2003 -ASCE 7-02 British -BS 8110 -Reinforced Concrete Building Examples based on BS 8110 Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

US Codes vs. British Codes Gravity Loads Office Building US Standards British Standards Live Loads 50 psf 52.5 psf Partitions 20 psf 20.5 psf Corridors 80 psf 83.5 psf Miscellaneous 15 psf Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

US Codes vs. British Codes (cont.) Loads Combinations US Standards ACI 318-02 British Standards 1- U = 1.4(D+F) 2- U = 1.2(D+F+T) + 1.6 (L+H) + 0.5 (Lr or S or R) 3- U = 1.2D + 1.6(Lr or S or R) + (1.0l or 0.8W) 4- U = 1.2D + 1.6W + 1.0L +0.5(Lr or S or R) 5- U = 1.2D + 1.0E+ 1.0L + 0.2S 6- U = 0.9D +1 .6W + 1.6H 7- U = 0.9D + 1.0 E + 1.6 H 1- U = 1.4 DL+ 1.6 LL + 1.4 En 2- U = 1.4 ( DL + W + En) 3- U = 1.2 ( DL + LL + W + En) Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

US Codes vs. British Codes (cont.) Wind Design Procedure US Codes Method 2 – ASCE 7-02 1- The basic wind speed V and wind directionality factor Kd 2- An importance factor I 3- An exposure category and velocity pressure exposure coefficient Kz 4- A topographic factor Kzt 5- A gust effect factor G 6- An enclosure classification 7- Internal pressure coefficient GCpi 8- External pressure coefficients Cp 9- Velocity pressure qz or qh 10- Designed wind load p Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

US Codes vs. British Codes (cont.) Wind Design Procedure (cont.) BS 8110 1- Determine the basic wind speed 2- Read off appropriate value of factor S2 (kz) 3- Multiply V by S2 to obtain characteristic wind speed Vs. 4- Read off characteristic wind pressure wk corresponding to Vs 5- Determine force coefficient Cf 6- F = wk A Cf Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Design of Gravity Systems Wide Module One-way Skip Joist -US CRSI 2002 Design Criteria - Girders depth = joists depth - T-Beams requirements apply - Minimum cover = 1 ½ in - Design shear strength = 2 Φ √f’c bw d - Minimum shear reinforcement =50 (bws)/ fy Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Design of Gravity Systems (cont.) Wide Module One-way Skip Joist US (cont.) Design Result - 66” Forms + 6” Ribs @ 72 c-c - depth = 24.5 in (20” Deep Rib + 4.5” Top Slab) - Concrete quantity = 83 psf For the End Span Tabulated Capacity 1002 plf Top Bars # 4 at 10 in Bottom Bars 2 # 7 Stirrups Single leg stirrups, # 3 spaced at 11 in for 123 in For the Interior Span Tabulated Capacity 1774 plf Top Bars # 5 at 11 in Bottom Bars 2 # 7 Stirrups Single leg stirrups, # 3 spaced at 11 in for 125 in Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Design of Gravity Systems (cont.) Wide Module One-way Skip Joist US (cont.) Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Design of Gravity Systems (cont.) Design Criteria Equivalent Frame Method ADOSS Software Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Design of Gravity Systems (cont.) Flat Slab with Drop Panels –US Design Results Item Value Comment Slab thickness 12.5” > Minimum Drop panel thickness 3.5 > ¼ slab thick. Maximum deflection 0.235” << Allowable Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Design of Gravity Systems (cont.) Flat Slab with Drop Panels –British Stand. Design Results Item Value Comment Slab thickness 13” Drop panel thickness 3.5 > ¼ slab thick. Maximum deflection 0.235” << Allowable Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Design of Gravity Systems (cont.) Two-way Slab with Beams – British Stand. Design Results Item Value Comment Slab thickness 10.5” Maximum deflection 0.236 in << Allowable Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Lateral System Seismic controls Concrete Moment Frames SAP 2000 Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Lateral System (cont.) Frame Design Considerations: 1 – Same Size Columns 2- Constant dimensions 3- 4% Concrete/Steel reinforcement ratio 4- Drift was set to not to exceed L/400 8- 5% percent of building width was included to account for torsional effect Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Lateral System (cont.) Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Lateral System (cont.) Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Lateral System (cont.) Design Result One-way Skip Joist Flat Slab US Codes Flat Slab British Codes Two-way with beams Column Sizes 18” x 18” 24” x 24” Varies 20” x 20” 22” x 22” 14 x 14 Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Steel Structure Lateral System Framing System - Composite steel with composite metal Deck - Beams are spaced 5’ O.C. Lateral System - Braced Frames around stairwells (Chevron, ) - Braced Frames around Elevator shaft (X) - Moment Frames around the perimeter Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Steel Structure (cont.) Typical Floor Plan Added columns Braced frames Braced Frames Moment Frames Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Steel Structure (cont.) Braced and Moment Frames Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Steel Structure (cont.) Design Results Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Steel Structure (cont.) Design Results (cont) W14 x 82 W 14 x 43 W 8 x 10 Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Steel Structure (cont.) Stress Design Check (Interaction Eq.) 0.8 – 0.89 Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Construction Management RSMeans 2005 ICE 2000 MC2 Modification Factor =0.96 Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Construction Management (cont.) System Comparison ( Concrete Structures) System Cost Time Preferred System One-way Wide Module Joist (Skip Joist System) 573,600 5.3 days/ floor XXXX Flat Slab with Drop Panels (US Standards) 742,400 6.13 days/ floor Flat Slab with Drop Panels (British Standards) 760,900 7.32 days/ floor Two-way Slab with Beams (British Standards) 568,800 6.37 days/ floor Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Construction Management (cont.) System Comparison ( Concrete vs. Steel) System $ Cost Preferred System One-way Wide Module Joist 573,600 Composite Steel with Composite Metal Deck 278,200 XXXXXX Agricultural Hall and Annex Ismail Al-Hadhrami-Structural Option

Conclusion US Standards - Concrete vs. Concrete -Wide Module One-way Joist - Concrete vs. Steel - Composite Steel with Composite Metal Deck

Conclusion (cont.) British Standards - Concrete vs. Concrete -Two-way with interior Beams

Acknowledgment Professor K. Parfitt – Special Thanks Dr. Ali Memari Dr. L. Hanagan Dr. T. Boothby Mr. Masoud Al-Hashimi Mr. Ammar Mohammed Gary Strand John McCarthy Selim Ercan Pat Hopple Darren Howard Joe Chan John Hill

Questions?