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Utilizing Steel Plate Shear Walls for Seismic Hazard Mitigation

Utilizing Steel Plate Shear Walls for Seismic Hazard Mitigation. NASA CIPAIR Summer Internship By: Agustin Robles, Cham Htun, David Alvarez, and Jasmine Flores Advisor: Dr. Cheng Chen Student Advisor: James Enright. Presentation Outline. Introduction to Steel Plate Shear Walls

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Utilizing Steel Plate Shear Walls for Seismic Hazard Mitigation

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  1. Utilizing Steel Plate Shear Walls for Seismic Hazard Mitigation NASA CIPAIR Summer Internship By: Agustin Robles, Cham Htun, David Alvarez, and Jasmine Flores Advisor: Dr. Cheng Chen Student Advisor: James Enright

  2. Presentation Outline • Introduction to Steel Plate Shear Walls • Background information on building and location • Design calculations • ASCE 7-10 Equivalent Lateral Force Procedure • AISC Code Provisions • Analysis of structure • SAP2000 lateral force simulations

  3. Steel Plate Shear Wall Frames • A SPSW frame has three main components: • Advantages of SPSW: • High plastic energy dissipation • Enhanced stiffness, strength and ductility • Cost efficient HBE Steel Plate VBE

  4. Problem Statement Design a 3-story office building located at 1300 Market Street, San Francisco, CA 94103. Utilize steel plate shear walls (SPSWs) as the lateral force resisting system. • Design the optimal member sizes for the: • Steel plates • Horizontal boundary elements (HBEs) • Vertical boundary elements (VBEs) • Utilize SAP2000 to simulate and evaluate the structures response to lateral forces.

  5. Building Specifications

  6. Earthquake Probability in the Bay Area

  7. Equivalent Lateral Force Procedure

  8. Vertical Distribution of Lateral Forces

  9. Max Story Drift

  10. AISC Seismic Code Provisions • Determine preliminary sizes for the three main components of the Lateral System • SPSW • HBE • VBE

  11. AISC Seismic Code Provisions • The Strip-model was used to approximate SPSW response to lateral forces • Solving for the angle of inclination, α • 3rd : α =41.3° • 2nd : α =39.3° • 1st : α =38.3°

  12. AISC Seismic Code Provisions • Demand Capacity Ratios (DCR) • Ratio of forces acting on a memberwith respect to the maximum strength or capacity of that member • Shear Capacity • Combined compression and flexure check

  13. AISC Seismic Code Provisions • Final member sizes • 2nd floor steel plate redesigned • 3rd and 2nd floor HBE redesigned • Final design

  14. SAP2000 Analysis of Structure

  15. SAP2000 Analysis of Structure • Figures of forces acting on the structure Moment Axial forces Shear forces

  16. SAP2000 Analysis of Structure

  17. Future Work/ Conclusion • Future/Current Work • Better approximation of the fundamental period of the structure • Designing the HBEs and VBEs to withstand some of the shear forces

  18. Any Questions?

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