Evaluation of Site Response Analysis Programs in Predicting Nonlinear Soil Response Using Geotechnical Downhole Array Data
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AbstractLiquefaction is a state of soil in which soil starts to behave as a fluid. This happens when the pore pressure rises up and it can’t get dissipated as fast as it is rising up during the earthquake. Trying to predict the soil dynamic response and taking into account the effects of this phenomena is one of the geotechnical engineering design challenges. A variety of available software have been used to carry out the above prediction. Important point here is the reliability of these software in terms of degree of accuracy. An evaluation between two most commonly used software packages, DEEPSOIL and OPENSEES, in estimating the seismic response of the soil has been conducted. OPENSEES is a finite element based program which is capable of 3D modeling meanwhile DEEPSOIL is a finite different based software which can only perform one dimensional modelling. This evaluation has been carried out by modeling a well instrumented geotechnical vertical array located by UC Santa Barbara using both computer programs. Analyzing the results, it can be seen that OPENSEES predicts the soil behavior more accurately. On the other hand, DEEPSOIL results are not satisfying.Moreover, a review of available methods for estimating the liquefaction induced lateral ground displacement has been carried out. As indicated, empirical methods such as Shamoto 1998 and Valsamis 2010 methods can provide fairly reasonable estimates in terms of lateral displacement estimations.Keywords: Liquefaction, OPENSEES, DEEPSOIL, Site Response Analysis.