The Influence of Bracing System on the Seismic Resistance of Medium Rise Building in Sabah

Abstract

With a magnitude of 5.9 on the Richter scale, the biggest earthquake in Malaysian historey struck Ranau, Sabah, on June 5, 2015. This study provides insights into the influence of bracing systems on the seismic resistance of medium-rise structures in Sabah. Many structures in Sabah did not take earthquake resistance into account. In this study, the strength of the structures must be increased by comparing the design of an actual building against building designs with the addition of a bracing system. The performance of a medium-rise building is evaluated using SAP 2000 software utilizing Static Non-linear Pushover Analysis (POA) and Dynamic Non-linear Time Historey Analysis (NTHA). The first model, Model 1, is the real design of the building, while Model 2 is a design that has been proposed with the installation of a bracing system, which can alter the structure's seismic performance. Both analyses demonstrate that model 2 has more muscular strength and better performance under seismic conditions in Sabah because it has the highest flexibility and the lowest inter-storey drift ratio. This proves that the higher the flexibility of a structure's elasticity, the better the structure's performance. Hence, the installation of a bracing system in a building has a positive impact on its performance under seismic conditions.