9732

8976

كارشناسي ارشد

سازه

اصفهان: دانشگاه صنعتي اصفهان، دانشكده عمران

1393

هشت،101ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

فرهاد بهنام فر

كياچهربهفرنيا

94/1/22

حسين تاجمير رياحي، بيژن برومند

مهندسي عمران

ID8976

Effect of soil structure interaction on seismic vulnerability of RC structures with shear wall and moment frames Meysam Banizadeh meysam 13852@yahoo com Date of Submission Department of Civil Engineering Isfahan University of Thechnology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor Dr Farhad Behnamfar farhad@cc iut ac ir AbstractThe seismic vulnerability of buildings is usually studied regardless of soil structureinteraction SSI Consideration of SSI can enhance the structural analysis and result inendorsement of behavior change of structures and their responses under seismic excitationsdue to flexibility of soil A number of methods are introduced in seismic codes for taking SSIinto account in order to predict the real performance of structures in earthquakes There aredifferent methods of soil structure interaction modeling such as direct analysis and sub structuring technique The direct method considers the structure and an extensive volume ofsoil in a general model while the sub structure method simulates the effect of soil usingsprings and dampers In this study a sub structure method named beam on nonlinear Winklerfoundation BNWF that is quite accurate and fast to analyze was implemented to assess theSSI effects The seismic vulnerability of 3 5 6 8 and 9 story buildings having momentframes both ways in one case and moment frames with concrete shear walls in another located on the soil types III and IV that are medium and soft soils according to the 2800Standard were discussed In the first step buildings were designed and modeled usingETABS conforming to the 2800 and ACI 318 05 codes Buildings were analyzed usingOpensees to assess their nonlinear responses The concentrated hinge method was used innonlinear modeling of beam and column elements Also the fiber method was applied formodeling of shear walls Maximum rotation of each plastic hinge was calculated using non linear dynamic analysis in two cases considering and neglecting soil structure interaction Damage to structural elements was assessed by determination of their performance level using FEMA 356 Changes in vulnerability regarding soil structure interaction wereevaluated As a result this study indicates that considering soil structure interaction changesthe damage extent of different elements differently Taking SSI into account generally resultsin an increased damage to beams that are directly connected to the shear walls but reducesdamage in moment frames in most cases Finally by comparing both cases it is highlightedthat consideration of soil structure interaction transmits the maximum story drift from themiddle floors to the first floor in moment frame buildings Key words Soil structure interaction seismic vulnerability RC structures nonlinear dynamic analysis

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حسين تاجمير رياحي، بيژن برومند