Numerical Modeling of Site Response and Soil Liquefaction
Date Issued
2014
Date
2014
Author(s)
Chang, Wei-Chen
Abstract
In the discipline of geotechnical earthquake engineering, theoretical site response analyses can be performed to evaluate how geologic deposit responds, in terms of particle motion and pore water pressure generation, when it is subjected to earthquake shaking.
Site response analyses can be classified according to their solution domain, the type of soil model employed, and whether pore water pressure response is considered. In common practice, frequency-domain total-stress site response analyses are often performed because parameter selection and code usage are relatively simple. Time-domain total stress site response analyses have become more popular because benchmarking studies had been performed to set up the proper parameter selection procedures and evaluate the differences between the ground motions predicted from frequency-domain and time-domain total stress analyses. On the other hand, effective-stress time-domain site response analyses are rarely performed because the parameter selection protocols for the soil material model and pore water pressure generation scheme are not available. The objective of this research is to review the currently available computer programs for effective-stress dynamic analyses and to compare the solutions from total stress and effective stress dynamic analyses. In this research, a series of numerical simulations had been run for simple hypothetical site conditions, cyclic triaxial tests and shaking table tests. From the simulation results, it is observed that the acceleration and pore pressure response predictions from different effective stress models are generally similar when the input motion level is low. However, at large input motion, the pore pressure response predictions from different effective stress models can be very different, even if the acceleration response predictions are similar. In addition, the pore pressure prediction model from OpenSees (compared to that in DEEPSOIL) seems to have a better performance as it is able to reproduce the shaking table test data on liquefied sand.
Subjects
DEEPSOIL
OpenSees
有限元素分析
地盤反應分析
有效應力分析
Type
thesis
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