Studies on Seismic Performance of RC Framed Buildings Using Pseudo-optimization Method

Abstract

Most of the RC framed buildings which are designed for seismic prone regions have to follow the ductile detailing procedure outlined in earthquake resistant design code IS 13920(2016) while the infill wall in the RC frames must follow the procedure outlined in IS 1893 (Part 1): 2016. Earthquake resistant design aims to completely utilize the ductile behaviour of the members and it’s constituent materials. Nonlinear analysis is frequently used to explore the ductile behaviour of the structure which is visible only beyond the yield limit/the linear range of the material behaviour. However, nonlinear dynamic analysis can be time consuming and resource intensive. Therefore, the goal of the present study is to utilise the material strength to full potential while keeping the analysis simple and robust. Hence, a pseudo optimization technique was adopted to improve the existing analysis and seismic design methods. The adopted method employs linear models of a structure whose seismic design has been enhanced and optimised based on modal energy. The pseudo-optimized design is a three-step process. The first step is to perform Pushover analysis to evaluate the seismic capacity of the existing building. In the next step, the variation of storey stiffness, storey strength and modal energy shall be examined along the height of the building considering the in-plane stiffness and strength of unreinforced masonry (URM) infill walls. As a last step, based on the modal energies observed in various structural members, the design is optimised. This method is practitioner friendly and has potential for industry level applications. © 2023, Springer Science and Business Media Deutschland GmbH. All rights reserved.