2912

2650

كارشناسي ارشد

خاك و پي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده عمران

1384

[نه]، 158، [II]ص.: مصور، جدول، نمودار

اميرمهدي خليليان

هشام ال نگار

داودمستوفي نژاد، ساسان عشقي

1395/12/10

كتابنامه

عمران

مهندسي عمران

ID2650

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

AbstractReinforced concrete stack like structures are normally modeled as fixed supported cantilever beam neglecting soil structure interaction In this research four stacks withheight of 80 140 194 and 304 assuming Iinear and nonlinear behavior were modeled andthe effect of foundation flexibility on their responseswere determined The effect of foundation flexibility on ductility capacity was also investigated The effect of foundation flexibility was considered by using substructure method implementing the concept ofimpedance functions of foundation The structure of stack is modeled by some beamelements locating concentrated massesat different levels stick model The nonlinearbehavior of beam elements was modeled using the theory of moment curvature Thewhole structure including supported on spring damper supports representing he soildynamic stiffness is subjected to Tabas earthquake and North South component ofElcentro earthquake with peak accelerationnormalized to 0 5g The results indicated thatsoil structure interaction increasesthe fundamental period of the structure and changesthe time history responsecontent Furthermore depending on the induced rotation anddeflection in foundation the foundation flexibility alters the structural responses ofmodels This emphasizes that in any cases it is necessary to consider soil structureinteraction in structural analysis of these type of structures In order to determine theductility capacity of models five artificial earthquake records having same frequencycontents but different in details were used in analyses Then by gradually increasing thenormal accelerati n records the analysis continued until the structure yields in elastic ofbehavior and collapses in inelastic zone Having obtained the time histories andmaximum normal acceleration in both elastic and inelastic behavior from the models theductility of such structures is determined by drawing their response spectrums andattributing them in both elastic and inelastic case The results of analysis show that soil structure interaction may decreasethe ductility of such structures l tJ I H s J A t J I J I LJ IJI J

اميرمهدي خليليان

هشام ال نگار

داودمستوفي نژاد، ساسان عشقي