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A Computer Program for Equivalent-Linear Site Response Analysis

SHAKE2000 is a Windows based, user-friendly computer program that will help geotechnical earthquake engineers and researchers with the analysis of site-specific response and the evaluation of earthquake effects on soil deposits. Hence, the main objective in the development of SHAKE2000 was to add new features to transform SHAKE and SHAKE91 into an analysis tool for seismic analysis of soil deposits and earth structures. As such, the governing philosophy in developing this new version of SHAKE was to lay before the user a suite of tools designed to answer questions of interest to both academia and the consulting professional. We then expect that SHAKE2000 will have a dual role in geotechnical earthquake engineering. First, it will be used as a learning tool for students of geotechnical engineering. Second, it will serve practitioners of geotechnical earthquake engineering as a scoping tool to provide a first approximation of the dynamic response of a site. Depending upon the prediction of site response, the practitioner will judge whether more sophisticated dynamic modeling is warranted.

SHAKE2000 is a software package that integrates ShakEdit and SHAKE. †ShakEdit was originally developed as a 16-bit, Windows 3.1 application that provided a graphical interface for SHAKE. It was originally conceived as an aid to the user in the creation of the input file and the graphical display of the programís numeric output. It accomplished the first step by incorporating user-friendly screens to assist in entering the arcane input data for the differing SHAKE options. The second step required the development of routines for the processing and error checking of output data, and for displaying that output in forms familiar to the geotechnical engineer. SHAKE was developed at the University of California, Berkeley, by H. Bolton Seed, John Lysmer and Per B. Schnabel. SHAKE computes the response in a system of homogeneous, viscous-elastic layers of infinite horizontal extent subjected to vertically traveling shear waves. The program is based on the continuous solution to the wave-equation adapted for use with transient motions through the Fast Fourier Transform algorithm. The nonlinearity of the shear modulus and damping is accounted for by the use of equivalent linear soil properties using an iterative procedure to obtain values for modulus and damping compatible with the effective strains in each layer.

For more information about the different features included in SHAKE2000, please browse through the User's Manual.

A step-by-step example showing how the program can be used to conduct an equivalent-linear site response analysis is provided in the Quick Tutorial.

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Published on: 2009-12-13 (32388 reads)

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Copyright © by GeoMotions, LLC All Right Reserved.