Doubly-Asymptotic, Boundary-Element Analysis of Nonlinear Soil-Structure Interaction.
Final rept. 14 Nov 77-30 Jun 79,
LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA PALO ALTO RESEARCH LAB
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This report describes a doubly-asymptotic DA, boundary-element BE treatment of a surrounding nonlinear soil medium for dynamic soil-structure interaction analysis. Linear soil-structure interaction is reduced to a surface relationship that is asymptotically exact at both high and low frequencies. Nonlinear soil-structure interaction is treated similarly, except a volume contribution is added in the volume a quasi-static and quasi-dynamic axisymmetric problem for which finite-element solutions have been obtained for comparison. For soil behavior based on J sub 2-plasticity theory, reasonable agreement is obtained. For soil behavior based on the Cap model, which is a combined I sub 1- and J sub 2-plasticity theory agreement is not obtained.