16084

14360

كارشناسي ارشد

سازه

اصفهان : دانشگاه صنعتي اصفهان

1399

پانزده، 101ص. : مصور، جدول، نمودار

محمدرضا افتخار، پيام اسدي

فرهاد بهنام فر، حسين تاجمير رياحي

1399/09/18

كتابنامه

مهندسي عمران

مهندسي عمران

1399/09/25

2656212

100 Investigation of Seismic Vulnerability of Historical Brick Minarets Case Study Historical Ziar Minaret SeyedSalar Ahmadi Ahmadi sslr@yahoo com Date of Submission September 16 2020 Department of Civil Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree Msc Language FarsiSpervisors Dr Mohammad Reza Eftekhar eft@iut ac ir Dr Payam Asadi asadi@iut ac ir AbstractDue to historical cultural and social value of ancient masonry structures they should be more considered Minarets were used for lightening of the roads at nights and also for saying Azan many years ago and theywere one of the main parts of old cities in Iran In this research seismic vulnerability of a 900 year old minaret Ziar minaret which was built by masonry materials has been done For his purpose some brick specimenswhich dates back to centuries ago was tested Then masonry prisms were used to obtain mechanical propertiesof brick and mortar together Next linear and nonlinear seismic behavior of minaret was investigated In thisregard ambient vibrate experiment was done to reach natural mode shapes of the structure Abaqus softwarewas chosen for Frequency static and dynamin analysis After verifying the frequency of FE model of theminaret with experimented one non linear analysis of minaret was triggered To verify nonlinear analysises the confined masonry wall tested by researchers in real dimentions was usedand it it was compared with the one that was modeled in Abaqus The comparison of location of the cracks andthe diagram that came out from Push over analysis illustrates that nonlinear modeling was correct Finally minaret structure was analyzed under 11 records of scaled earthquake with Time History analysis Forparametric investigation of the minaret structure shortened minarets with height of 40 30 20 meters weremodeled and time history analysis was done again on these minarets Results show that the fracture of minaretstructure happens and starts from bottom of minarets In higher minarets with ratio of hight to width from 9to 6 with regards to impression of higher modes in upper rigions of minaret fracture would happen althoughin shorter minaret yield points are located in the bottom of minaret Key WordsMinaret Structure Brick Masonry Materials Abaqus Software Modal Analysis Non Linear Analysis Seismic Vulnerability

محمدرضا افتخار، پيام اسدي

فرهاد بهنام فر، حسين تاجمير رياحي