INVESTIGATION OF THE INFLUENCE OF SUPERSTRUCTURE FLEXIBILITY ON THE BEHAVIOR OF BASE-ISOLATED STRUCTURES

Abstract

The use of single friction pendulum bearings in seismic design with base isolation techniques has become popular worldwide, and its damping efficiency is highly regarded. However, the disadvantage of base isolation techniques is the large lateral displacement of the bearings and the superstructure. Therefore, the maximum lateral displacement of the bearings is always a major concern during the design process. In preliminary design, this parameter is allowed to be quickly determined using the equivalent lateral force procedure. According to this method, the superstructure is assumed to be a rigid body when certain specified criteria are satisfied. This assumption can be the cause of distortion in the behavior of the isolated structure. This study aims to investigate the influence of structural flexibility on the maximum displacement of the bearings and the absolute acceleration of the superstructure. The time history analysis results from various numerical models using OpenSees software were utilized for evaluation.