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LESSLOSS Sub Project 7 Techniques and Methods for Vulnerability Reduction

LESSLOSS Sub Project 7 Techniques and Methods for Vulnerability Reduction Seismic Upgrading of Structures Using Conventional Methods. Prof.Dr.M.Hasan Boduroğlu Assoc. Prof. Dr. Engin Orakdöğen Assist. Prof. Dr. Konuralp Girgin Berna Büyükşişli Civil Eng. MSc.

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LESSLOSS Sub Project 7 Techniques and Methods for Vulnerability Reduction

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  1. LESSLOSS Sub Project 7 Techniques and Methodsfor Vulnerability Reduction SeismicUpgrading of Structures Using Conventional Methods Prof.Dr.M.Hasan Boduroğlu Assoc. Prof. Dr. Engin OrakdöğenAssist. Prof. Dr. Konuralp Girgin Berna Büyükşişli Civil Eng. MSc. Ergun Binbir Civil Eng. MSc. Lisbon24thMay 07 LESSLOSS Dissemination Meeting İstanbul Technical University

  2. Existing Building-Normal Story Plan Strengthened Building-Normal Story Plan

  3. Periods of the strengthened building Equivalent earthquake loads of strengthened building (TEC-2007)

  4. The mathematical modelused for the analysis of building with mat foundation Strengthened building with mat foundation EF=ks*Ae*Unit Length Tension Limit=0 Compression Limit=qu* Ae ks=30000 kN/m3, qu=187.5 kN/m2

  5. Procedures for including soil-structure interaction effects according to FEMA-440

  6. Procedures for including soil-structure interaction effects according to FEMA-440

  7. Procedures for including soil-structure interaction effects according to FEMA-440

  8. Procedures for including soil-structure interaction effects according to FEMA-440

  9. Performance graphic of strengthened building with fixed base (FEMA-440)

  10. Performance graphic of strengthened building with mat foundation and without kinematic interaction (FEMA-440)

  11. Performance graphic of strengthened building with mat foundation including kinematic interaction (FEMA-440)

  12. Performance graphic of strengthened building with mat foundation including kinematic interaction and base damping (FEMA-440)

  13. Performance graphic of strengthened building with mat foundation including kinematic interaction and base damping(FEMA-440)

  14. Comparison of the performance points of the strengthened building with fixed base and mat foundation (FEMA440)

  15. Performance evaluation of strengthened building with mat foundation according to non-linear static push-over analysis method of ATC-40

  16. PRELIMINARY CONCLUSIONS • Kinematic interaction and base damping mostly depend on footprint area and effective stiffness of the structure. • The elastic behavior of mat foundation does not affect the non-linear behavior of the structure and the top displacement of the structure with mat fondation is linearly translated compared to the structure with fixed base. • Base shear demand of the structure with mat foundation is almost the same compared to the structure with fixed base due to the small post yield stiffness, however, displacement demand increases 33% depending on the increases of equivalent periodes. • Increase of the base damping ratios do not considerably affect the base shear demands, but they decrease the displacement demands at the performance points. • Soil pressures under the mat foundation remain at the linear region at the performance point levels.

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