Journal article

Seismic load estimates of distant subduction earthquakes affecting Singapore

NTK Lam, T Balendra, JL Wilson, S Venkatesan



This paper introduces the use of a simple stochastic model for predicting elastic response spectra of 5% damping for structures founded on rock sites in Singapore based on earthquake scenarios of moment magnitude Mw = 9 - 9.5 generated from the Sunda-Arc subduction source at a closest distance of 600 km. Structures founded directly on rock are predicted to be subject to low response spectral accelerations of up to 1.3% gravitational acceleration. The maximum velocity demand on a structure is estimated to be in the order of 50 mm/s. The drift demand on a structure is estimated to be generally low but can be up to some 80 mm on single-degree-of-freedom systems possessing a high natural period ..

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University of Melbourne Researchers


Funding Acknowledgements

Constructive feedbacks from Dr Jack Pappin of Ove Arup & Partners (Hong Kong Office) on the draft manuscript of the paper are gratefully acknowledged. The provision of recorded accelerograms by the Meteorological Service Singapore is gratefully acknowledged. Research collaboration with University of Hong Kong (particularly with Dr Hing-Ho Tsang) in related studies have contributed to the development of the research methodology which was employed in this study. Advice given by Professor C.G. Koh of National University Singapore on matters related to building construction in Singapore is also acknowledged.