基于修正Tresca屈服准则的水平循环受荷桩二维数值模拟
首发时间:2015-12-18
摘要:通过有限元软件二次开发引入土体弱化模型,进行了水平循环受荷单桩的二维数值模拟分析,分别考虑土体刚度指数,循环位移幅值和土体弱化参数对桩侧刚度以及桩侧极限抗力的影响。静载条件下,土体刚度指数对桩侧极限抗力没有影响。水平循环加载后,随着土体刚度指数增加,桩侧循环后极限抗力减小;随着循环位移幅值增大,相应的循环后极限抗力减小。其他条件相同时,重塑土与原状土的抗剪强度比值 越大,循环后桩侧极限抗力衰减越慢;土体应变弱化参数 越大,循环后桩侧极限抗力衰减越慢。 值决定了长期循环荷载下桩侧循环后极限抗力稳定值的大小。
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Two-dimensional Finite Element Simulation about Single Pile Subjected to Cylic Load Beased on Tresca Yield Criterion
Abstract:A degradation model based on accumulated plastic strain is adopted to model the cyclic degradation of the undrained soil strength. And a series of two-dimensional finite element simulations about single pile subjected to cyclic load are carried out to analyze the influence of the ratio of elastic modulus and undrained soil strength, as well as the amplitude of load and the parameters of degradation model. It is found that the ratio of elastic modulus does not affect the ultimate resistance in the static load, however , during the cyclic load the resistance degrades faster when the ratio of elastic modulus is larger. The larger of the amplitude of load, the faster of reduction of the ultimate resistance. It is also found that with identical conditions the larger of the ratio of fully remolded and initial shear strength, the slower of reduction of the ultimate resistance. It is also found that with identical conditions the larger of the parameter of plastic strain, the slower of reduction of the ultimate resistance. What's more, the ratio of fully remolded and initial shear strength contrals the value of the residual ultimate resistance.
Keywords: Finite element Secondary development Ratio of elastic modulus Ultimate resistance
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