Influence of Constitutive Models on Ground Motion Predictions

by Melvin L. Baron, (F.ASCE), Part. and Dir. of Res.; Weidlinger Assocs., New York, NY,
Ivan Nelson, (M.ASCE), Assoc.; Weidlinger Assocs., New York, NY,
Ivan Sandler, Assoc.; Weidlinger Assocs., New York, NY,

Serial Information: Journal of the Engineering Mechanics Division, 1973, Vol. 99, Issue 6, Pg. 1181-1200

Document Type: Journal Paper


In recent years, the development of mathematical models for the study of ground shock effects in soil, or rock media, or both, has made important progress. Three basic types of advanced models have been studied: (1) elastic-ideally plastic models; (2) variable moduli models; and (3) elastic-nonideally plastic capped models. The ground shock response in the superseismic range of a 1-MT air burst on a homogeneous half-space of a soil is considered. Each of the three types of models was fitted to laboratory test data and calculations were made for each case. The results from all three models are comparable only when the stress paths in uniaxial strain are comparable for complete load-unload cycles. Otherwise, major differences occur in the lateral motions and stresses. Consequently, material property laboratory data now include the stress path whenever possible for modeling purposes.

Subject Headings: Mathematical models | Ground motion | Laboratory tests | Elastoplasticity | Constitutive relations | Elastic analysis | Lateral stress | Homogeneity

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