Response spectrum modelling for regions lacking earthquake records

A.M. Chandler; Nelson Lam; John Wilson; G.L. Hutchinson

doi:10.56748/ejse.1151

Authors

A.M. Chandler University of Hong Kong
N.T.K. Lam University of Melbourne
J.L. Wilson Swinburne University of Technology
G.L. Hutchinson University of Melbourne

DOI:

https://doi.org/10.56748/ejse.1151

Keywords:

Seismic design, Response spectrum, Component Attenuation Model, Moderate seismicity regions

Abstract

The design response spectrum is typically the starting point of most codified seismic design and assessment procedures and is predominantly used to prescribe the applied inertia forces induced by earthquake ground motions. In a recent paper, the authors presented and discussed the key properties, limitations, engineering interpretation and modern concepts relating to various types of earthquake design response spectra, including the acceleration, displacement and velocity spectra. The present paper provides a critical evaluation of the various deterministic and probabilistic approaches to response spectrum modelling, including an introduction to the Component Attenuation Model (CAM). The CAM modelling approach was developed recently by the authors, with the express purpose of providing a novel response spectrum modelling technique for regions lacking earthquake records. Traditional approaches for the prediction of earthquake actions using design response spectra rely on accurate hazard models for the region concerned, which in turn depend heavily on the availability of strong ground motion data from the local seismic region, or from analogous regions with similar geological and seismo-tectonic features. In the case of regions with low to moderate levels of seismicity, such data is at best scarce and in many cases unreliable, and this presents unique problems for designers carrying out seismic analysis for new construction or assessing the seismic reliability of existing buildings, bridges and infrastructure. For such regions, novel approaches (such as CAM) which adapt local seismological information for the purpose of earthquake ground motion modelling may be considered. Further key issues including the determination of the Maximum Considered Earthquake, are also addressed in this paper.

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Author Biography

N.T.K. Lam, University of Melbourne

Nelson Lam is Professor and leader of the Structures and Buildings Discipline in the Department of Infrastructure Engineering at The University of Melbourne. He has 38 years of experience in structural engineering, and has been working in the specialized field of earthquake engineering, impact dynamics and structural dynamics.

He is member of the standing committee for future revisions to the Australian standard for seismic actions, member of the Seismic and Dynamic Events Panel commissioned by the London Headquarter of The Institution of Structural Engineers, and international expert advising the geotechnical engineering office of the government of Hong Kong SAR over the design of barriers for protection against landslides and rockfalls. His achievement in research in this field was recognized by the award of the Chapman Medal (1999) and Warren Medal (2006) by Engineers Australia; the Best Paper Award (2004-2007) by the ISET Journal of Earthquake Technology; and Chapman Medal for the second time in 2010. He is also recipient of Award for Teaching Excellence given out by Engineers Australia in 2012 and Academic Staff Teaching Award by Melbourne School of Engineering in 2013. His early career as structural engineer was with Scott Wilson International throughout the 1980’s and attained British chartered engineer status during that period. He was awarded the degree of BSc in civil engineering with first class honours at the University of Leeds, England in 1981, MSc degree in concrete structures at Imperial College of Science & Technology, London in 1982 and PhD in earthquake engineering at the University of Melbourne in 1993.

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