Evaluation of Seismic Behavior of Irregular Structures in Plan and Height by Using Non-Linear Static Analysis

Abstract

According to the architectural and operational considerations and creation of a variety of irregularities in plan and height of buildings, studying seismic behavior of these buildings has always been in the center of researchers' attention. This study investigated seismic behavior of irregular buildings in plan and height by using non-linear static analysis. Selected irregularities were defined to evaluate in two ways including geometric irregularities in plan and height as well as mixing these two mentioned ones. Irregularities in plan were defined in one direction and with two values of low and high. Irregularity at height was created through recession on one direction of building in two stairs. In addition, some buildings were taken into account with mixed irregularities in plan and height in low and high forms. Defined irregular buildings were designed by three types of systems including special steel flexure frame, special steel flexure frame with special converged bracing, and special steel flexure frame with special concrete sheer wall by using ninth and tenth sections of national regulations. After designing mentioned buildings in PERFORM 3D, non-linear static analysis was performed in both directions.