Building evaluation using two components of acceleration time histories causes by shallow crustal fault earthquakes with maximum magnitude 7 Mw

Abstract

Spectral acceleration and acceleration time histories are the two seismic loads generally used for dynamic analysis of a building. The structural design of buildings is implemented using spectral acceleration at the ground surface obtained from the national seismic code. However, acceleration time histories are developed from specific earthquake events and implemented for building evaluation. This paper presents building evaluations of three existing buildings located in Semarang with heights of at least 40 m. The buildings were built on three different soil types, that is, hard, medium and soft soils. The evaluation was performed by conducting two component north-south and east-west directions of acceleration time histories modified from Semarang fault earthquake scenarios having a magnitude of 7 Mw and maximum epicentre distance 15 Km. Due to incomplete data on Semarang fault earthquakes, the acceleration time histories incorporated herein were collected from worldwide earthquake data bases and modified using response spectral matching and seismic propagation analysis. Stability analyses in terms of structural deformation and drift ratio were carried out for the three buildings. The results show that all three buildings have the capability to resists earthquakes up to a maximum magnitude of 6.5 Mw with an epicentre distance of over 5 Km.