Computation of degradation factors of p-y curves in liquefiable soils for analysis of piles using three-dimensional finite-element model |
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| Affiliation: | 1. Key Lab of Structures Dynamic Behavior and Control, Harbin Institute of Technology, Ministry of Education, Harbin, Heilongjiang 150090, China;2. School of Civil Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, China;1. School of Civil Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, China;2. School of Civil Engineering, Qingdao Technological University, Qingdao, Shandong 266033, China;1. Department of Civil and Environmental Engineering, Faculty of Engineering, Shiraz University, Shiraz, Iran;2. Department of Civil and Environmental Engineering, Faculty of Engineering, Western University, London, ON, Canada, N6A 5B9;1. Postgraduate Student, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan;2. Assistant Professor, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan;3. Professor, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan;1. Bridge Software Institute, Department of Civil and Coastal Engineering, University of Florida, Gainesville, FL 32611, USA;2. School of Civil Engineering and Environmental Science, University of Oklahoma, Norman, OK 73019, USA |
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| Abstract: | This paper presents a procedure to compute the values of degradation factors of p-y curves in the pseudo-static analysis of piles in liquefiable soils. Three-dimensional finite-element model was used for the computation of p and y values using OpenSees computer package. The piles were modeled using beam-column elements and elastic section. The soil continuum was modeled using brick elements and a two-surface plasticity model. By comparing the results of models in two cases of liquefiable and non-liquefiable, values of degradation factors were obtained. Validation of the degradation factors computed was conducted through the centrifuge test results. The simulation results showed a similar trend between degradation factor variation in different densities and sands. With increasing depth, the degradation factor increased. By comparing the results of pseudo-static analysis with the centrifuge test results, it was concluded that the use of the p-y curves with computed degradation factors in liquefiable sand gave reasonable results. |
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| Keywords: | Pile foundations Liquefaction p-y curves Pseudo-static method Degradation factors |
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