Vol 24, No 1 (2020) > Civil Engineering and Architecture >

Liquefaction Potential Analysis Based on Nonlinear Ground Response on the Coastline of Bengkulu City, Indonesia

Lindung Zalbuin Mase 1

Affiliations:

  1. Department of Civil Engineering, Faculty of Engineering, Universitas Bengkulu, Bengkulu 38371, Indonesia

 

Abstract: This paper presents the study of seismic response analysis and liquefaction potential of coastal area of Bengkulu City due to September 12, 2007 Earthquake. This study is conducted by collecting site investigation data (SPT) and applying input motion to observe soil response. The synthetic ground motion is generated by considering important aspects of earthquake, i.e. focal depth, epicenter, earthquake source, and site classification. The synthetized ground motion is then used as the input motion in seismic response analysis. The results of this analysis are spectral acceleration and PGA on each depth. The result of spectral acceleration is also compared with seismic design code of Indonesia (SNI 03-1726-2012). Liquefaction potential analysis is performed considering the results of seismic response analysis. Result shows that spectral acceleration resulted depends on soil type. A higher density means the lower spectral response. In general, the designed spectral acceleration is still reliable to consider the spectral acceleration of each borehole, especially for T (Period) < 1. However, for T > 1 spectral acceleration should be concerned, especially for high-rise building construction. For liquefaction analysis, the shallow depth is relatively vulnerable to undergo liquefaction.
Keywords: wave propagation; earthquake; liquefaction potential, Bengkulu City
Published at: Vol 24, No 1 (2020) pages: 34-42
DOI:

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