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.
Highlights
Stability analysis from earthquake event scenarios is one of the important methods of evaluating the stability of the structure
The stability of a structure is evaluated with respect to the deformation and internal drift ratio caused by earthquake forces and response spectral acceleration models
It seems that for building B1, all the spectral acceleration values calculated from the acceleration time histories are less than the SNI-03-1726-2012 spectral acceleration
Summary
Stability analysis from earthquake event scenarios is one of the important methods of evaluating the stability of the structure. The analysis is performed by taking acceleration time history data generated from earthquake events as the input earthquake load on the structure. The objective of this analysis is to obtain the resistance of the structure when subjected to an earthquake in terms of magnitude and distance. The stability of a structure is evaluated with respect to the deformation and internal drift ratio caused by earthquake forces and response spectral acceleration models. This paper presents a similar analysis for three buildings (hospital, hotel, and university buildings) with respect to two components or directions (north–south (NS) and east–west (EW)) of Semarang fault earthquake scenarios
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