Development of design response spectra for Ipoh
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Date
2009
Authors
Arshad, Mohd Rashwan
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Abstract
Seismic awareness becomes a critical issue in Malaysia after experienced a series of tremors originated from Sumatra. Although situated in stable shelf, several places in west coast Peninsular Malaysia have experienced ground shaking effect due to long distance earthquake which occurred in Acheh and Nias. The main objective of this study is to develop design response spectra on the site-specific. The city of Ipoh was selected as case study areas to evaluate the soil effects that involve the site response characteristics of various soil types. Prediction of the maximum magnitude for the future earthquake was determining using Kijko-Sellevol estimator. The maximum magnitude mmax for Sumatran fault zone (SFZ) and Sumatran subduction zone (SSZ) are found to be 7.8 and 9.24 respectively. Besides that, prediction of ground motion is the critical step to perform seismic hazard analysis. Results show that the peak ground acceleration (PGA) on the bedrock at Ipoh was 0.0257g for (SFZ) and 0.0174 g for (SSZ). The analysis of dynamic response performed shows that generally Ipoh consists of three types of soil conditions; SC (very dense soil and soft rock), SD (stiff soil) and SE (soft soil). The peak response spectra acceleration (RSA) value for these soil types is 0.25g, 0.28g and 0.31g for site class Sc, SD and SE, respectively. The smoothed response spectrum or design response spectra of seismic force was established according to Uniform Building Code (UBC 1997), National Earthquake Hazards Reduction Program (NEHRP 2000) and Eurocode 8 (EN 1998 – 1). Results show that there is no significant different in term of peak design response spectra except for the period of design response spectra.
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Master
Keywords
Science , Design response spectra