Site-Specific Ground Responses Analysis at Offshore of Bintulu, Sarawak

CHONG, KONG CHENG (2019) Site-Specific Ground Responses Analysis at Offshore of Bintulu, Sarawak. [Final Year Project Report] (Unpublished)

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Abstract

Engineers have started to consider seismic design for structures in Malaysia since several evidences proven that Malaysia is no longer free from seismic hazard. The establishment of Malaysia National Annex to Eurocode 8 (MS EN 1998-1:2015) indirectly advised engineers in Malaysia to treat seismic design as a requirement in building design. Hence seismic hazard analysis for critical structure such as power plant and oil plantation are important to ensure it can sustain earthquake as failure of such critical structure will lead to pollution of the environment. The main objective of this research is to establish the seismic design response spectra for offshore structure in Malaysia. For site-specific ground response analysis, steps are followed starting with extraction of soil data from soil investigation report, determine the suitable input ground motions, conducting ground response analysis using equivalent linear approach and lastly develop the site-specific response spectra. In this study it was found that site-specific ground response analysis provided better seismic amplification factor and design response spectrum since it utilises the actual local soil data extracted from site investigation report compared to the simplified design response spectrum provided by the code. BH5_GM6 recorded the highest amplification factor of 6.471. The second peak recorded for near-field earthquakes has the amplification factor of 5.241 by BH4_GM6. Whereby for far-field earthquakes, BH5_GM1 recorded highest amplification factor of 7.253 and BH4_GM1 recorded the second highest peak of 6.173. The soil factor S from the design response spectrum for offshore of Bintulu are higher than the soil factor S of Malaysia National Annex. This could be due to the limitation of National Annex that consider the average of soil investigation data.

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