Optimus AE Senior Thesis 2013 Punit G. Das | Structural Option - PowerPoint PPT Presentation

Signature Boutique Offices , India Optimus AE Senior Thesis 2013 Punit G. Das | Structural Option The Faculty Advisor: Dr. Linda Hanagan

Building Information Location and Site Map The Optimus | India  Building Information  Existing structural system  Office + Parking garage + Retail  Thesis Statement   Ground + 17 floors Thesis Solution  Gravity System  430,000 sq. ft.  Composite Floor system  Max height: 230 ft.  Lateral System  Moment Connection Design  January 2012 – October 2013  Effect on foundations  Conclusion

Project Team The Optimus | India  Building Information  Existing structural system  Owner + Project Manager + General Contractor:  Thesis Statement Lodha Group  Thesis Solution  Architect: Pei Cobb Freed & Partners, New York  Gravity System  Composite Floor system  Local Architect: Edifice Consultants Pvt. Ltd.  Lateral System  Structural Engineer: Leslie E. Robertson Associates  Moment Connection Design  MEP Consultant: Spectral Consultants Pvt. Ltd.  Effect on foundations   Conclusion Lighting Designer: George Sexton Associates

Building Information Architecture The Optimus | India  Building Information  Open Floor Plan  Existing structural system  South facing offices for panoramic views  Thesis Statement  Balconies on every floor  Thesis Solution  Façade: Glass + Aluminum + Stone, designed for  Gravity System  Composite Floor system  Roof garden + Cafeteria + Gymnasium  Lateral System  Moment Connection Design Balcony  Effect on foundations  Conclusion South facing offices

Existing Gravity System The Optimus | India  Building Information  Open floor plan: Perimeter columns + 1 row of  Existing structural system interior columns  Thesis Statement  8” flat slabs with additional 8” drop panels  Thesis Solution Arch Ar chit itecture ecture   3’x1.5’ to 3’x7’ rectangular columns for parking Gravity System  Composite Floor system space  Lateral System  1.5’ to 3’ diameter circular columns in office spaces  Moment Connection Design  Building façade supported at cantilevered slab edges  Effect on foundations   Concrete strength range from 5000 psi to 7000 psi Conclusion

Existing Lateral System The Optimus | India  Building Information  Reinforced concrete shear walls ranging from 12” to  Existing structural system  20” Thesis Statement  Thesis Solution  8 ft. to 25ft. walls in North-South direction and 47 ft. Arch Ar chit itecture ecture  Fac acades ades Gravity System wall in East-West direction  Composite Floor system  Shear walls wrap the elevator shaft and stairwells  Lateral System   Due to proximity to the Arabian sea, wind loads Moment Connection Design  Shear wall layout Effect on foundations control the lateral system  Conclusion

Concrete in India Mumbai The Optimus | India  Concrete is a most prevalent building material  Building Information   Mumbai is called Concrete Jungle Existing structural system  Thesis Statement  Client’s perception that concrete is cheap  Thesis Solution  Cheap labor Arch Ar chit itecture ecture  Fac acades ades Gravity System  Cheap design consultation  Composite Floor system   Concrete design is comfort zone of most architects Lateral System  Moment Connection Design and engineers  Effect on foundations Image Courtesy of www.skyscrapercity.com  Lack of steel construction firms  Conclusion

Problems with concrete Building collapse in Mumbai The Optimus | India  Building Information  Existing structural system  Thesis Statement  Environmental impact  Thesis Solution  Hard to maintain quality control in India Arch Ar chit itecture ecture  Fac acades ades Gravity System  Cheap labor can sometimes be harmful.  Composite Floor system   Member sizes get huge with taller buildings Lateral System  Moment Connection Design  Future challenges require alternate materials  Effect on foundations Image Courtesy of The Hindu Newspaper  Conclusion

Solution Thesis Preview The Optimus | India  Building Information  Existing structural system  Analyze and design of gravity members  Thesis Statement  Explore benefits of Steel design  Analyze and design lateral system  Thesis Solution  Requires less but skilled labor  Arch Ar chit itecture ecture Typical steel-connection design  Fac acades ades Gravity System  Quality control easier   Composite Floor system Cost-benefit analysis   Taller building can have smaller members Lateral System  Integration and optimization with architecture  Moment Connection Design  Reduced weight of overall structure  Integration and optimization of facade  Effect on foundations  Conclusion

New Gravity system Structural floor plan The Optimus | India  Building Information  Existing structural system Parking floor plan  Interior gravity columns - Steel wide-flange columns  Thesis Statement encased with reinforced concrete  Thesis Solution  New Gravity System Arch Ar chit itecture ecture  Edge columns – W14 and W12 Steel wide flange Fac acades ades  Composite Floor system  Superimposed dead Loads used from existing system  Lateral System  Critical design load combination - 1.2Dead Office floor  Moment Connection Design plan +1.6Live+0.5Roof Live (ASCE 7-10)  Effect on foundations  Conclusion

New Gravity system The Optimus | India  Building Information  Existing structural system   Following AISC Manual Chapter I Thesis Statement  Thesis Solution  Columns mainly checked for compression, minimum  New Gravity System Arch Ar chit itecture ecture Fac acades ades size of steel core and critical elastic bucking  Composite Floor system  Composite columns caused 40% reduction in column  Lateral System  size in parking spaces compared to existing system Moment Connection Design  Effect on foundations  Conclusion

Integration to architecture Typical office floor plan The Optimus | India  Building Information  Small columns can be integrated easily in the Existing structural system space   Optimized open floor plan Thesis Statement  Thesis Solution  Increased floor space in office and parking Utility areas  New Gravity System Arch Ar chit itecture ecture Fac acades ades Restrooms Stairwell Stairwell Elevator shafts  Less obstruction of interior columns to daylight  Composite Floor system  Concrete encasing has fire-proofing advantage  Lateral System Office Space  Moment Connection Design  Effect on foundations Typical office floor plan  Conclusion

Composite Floor System Composite system cross-section The Optimus | India  Building Information  Existing structural system  For typical office floor W14x30 beam and W18x46  Thesis Statement girder with 1.5VLI20 Vulcraft deck used  Thesis Solution  Ar Arch chit itecture ecture  Steel deck runs perpendicular to beam and parallel Fac acades ades New Gravity System  Composite Floor system to girder  Lateral System  1.2Dead + 1.6Live load combination used  Moment Connection Design  AISC Manual table 3.21 and 3.20 used to design a  Effect on foundations  partially composite section Conclusion

Building Information Lateral system The Optimus | India  Building Information  2 Moment frames in North-south direction  Existing structural system   2 Braced frames in North-South direction Thesis Statement  Thesis Solution  2 Braced frames in East-West direction  Arch Ar chit itecture ecture Fac acades ades Gravity System  All columns are steel wide flange W12 encased in  Composite Floor system reinforced concrete. Size range – 34” to 24”  Lateral System   All columns designed for compression created due to Moment Connection Design  Effect on foundations lateral loads  Conclusion

Building Information Lateral system Drifts (inches) The Optimus | India  Building Information  ASCE 7-10 Directional procedure used to calculate  Existing structural system  wind loads and drifts Thesis Statement  Thesis Solution  ASCE 7-10 Equivalent Lateral Force Procedure and  Ar Arch chit itecture ecture Fac acades ades Gravity System Modal Response Spectrum Analysis used  Composite Floor system  The two seismic analysis procedures compared  Lateral System  based on drifts and base shears Moment Connection Design  Effect on foundations  Conclusion