Solution4a - CE 728 GEOTECHNICAL EARTHQUAKE ENGINEERING...

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Unformatted text preview: CE 728 GEOTECHNICAL EARTHQUAKE ENGINEERING ASSIGNMENT #4 SENSITIVITY ANALYSIS USING SHAKE91 26.11.2001 MIDDLE EAST TECHNICAL UNIVERSITY DEPARTMENT OF CIVIL ENGINEERING Unnormalized Pseudo Acceleration Response Spectra Using Various Number of Sublayers 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,01 0,10 1,00 10,00 T - log scale (sec) Spectral Ordinates (g's) 2 Sublayers (RUN 00) 4 Sublayers (RUN 01) 7 Sublayers (RUN 02) ANIL YUNATCI 1213701 TABLE OF CONTENTS TABLE OF CONTENTS1 DESCRIPTION OF THE PROBLEM. 2 SETS OF RUNS TO ACHIEVE THE SOLUTION..... 2 DIGITIZATION OF MODULUS & DAMPING CURVES. 3 NOTES ON INPUT FILE GENERATION. 4 SENSITIVITY STUDY- NUMBER OF SUBLAYERS. 5 SENSITIVITY STUDY- DIFFERENT V S .. 5 SENSITIVITY STUDY- LINEARLY CHANGING V S . 6 SENSITIVITY STUDY- DIFFERENT MATERIAL PROPERTIES7 CONCLUDING REMARKS.7 REFERENCES . 8 APPENDIX I9 APPENDIX II. 10 ii 1. DEFINITION OF THE PROBLEM A sensitivity study using SHAKE91; a computer program which computes the response of a semi-infinite horizontally layered soil deposit overlying a uniform half- space subjected to vertically propagating shear waves is requested. SHAKE 91 makes the analysis in the frequency domain, and, therefore, for any set of properties it is a linear analysis. An iterative procedure iii (equivalent linear model) is used to account for the nonlinear behaviour of the soils. For detailed information and assumptions of the model, the reader is advised to refer to SHAKE 91 Users Manual. Sensitivity study will be made by conducting runs with different soil profiles and characteristics, and the observed difference will be reported. II. SETS OF RUNS TO ACHIEVE THE SOLUTION The soil profile is given as generic 30m deep soil deposit with average dynamic properties (V s =170-350 m/s, PI=15) with provided Adapazar rock motion scaled to 0.25g. First, soil profile is idealised as a single layer, then consisting of 3 and 6 sublayers respectively, excluding the last sublayer; the bedrock in each case. Soil profiles are shown below: Figure 1: Idealised soil profile types (by number of sublayers)....
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This note was uploaded on 05/09/2008 for the course CIVIL ENGI CE 728 taught by Professor Cetin during the Fall '06 term at Middle East Technical University.

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Solution4a - CE 728 GEOTECHNICAL EARTHQUAKE ENGINEERING...

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