هانيه جعفري

The main objective of this research is to study and compare the seismic performance of optimized triple and quintuple pendulum friction isolators in a steel structure subjected to far-field earthquakes using SAP2000 software (version 2023). Ultimately, four different building models were created and compared with each other. Additionally, the design of all isolators and structures was performed according to the equivalent static design method approved in the ASCE7-16 standard. The study specifically examined the effects of designing the structure and isolators with minimum standards during severe earthquake events. The pendulum friction isolators were optimized using sensitivity analysis and placed under all columns of the structure. In this study, the ultimate capacity of both isolator models was designed to preferably progress through their last movement regime during far-field earthquakes to capture the effects of all movement regimes on the superstructure's response. To enhance the credibility of the studies and calculations in this research, OpenSees software (version 2٫5) was also utilized to plot the force-displacement curves of the designed isolators, allowing for a comparison of results with those obtained from SAP2000. All models were eva‎luated through nonlinear time history analysis, where seven far-field earthquakes were scaled in two directions (X and Y) according to the ASCE7-16 standard using the SRSS method. Key outputs of this research include inter-story shear, relative displacement of floors, absolute acceleration of floors, and displacement of isolators. Generally, in the model with quintuple pendulum friction isolators compared to the triple model, there was approximately a 13٪ reduction in inter-story shear and about a 38٪ reduction in acceleration; however, the reduction in floor drift was nearly equal in both cases.

جداساز اصطكاكي پاندولي سه گانه , جداساز اصطكاكي پاندولي پنج گانه , تحليل تاريخچه زماني غير خطي , SAP2000 , OpenSees

Triple Friction Pendulum , OpenSees , SAP2000 , Quintuple Friction Pendulum , Nonlinear Time History Analysis

Haniye Jafari

Dr. Gholamreza Ghodrati Amiri