对UE土体动力本构模型的修正

发布时间：2018-04-16 16:37

  本文选题：动力作用 + UE本构模型　； 参考：《地震工程学报》2014年04期

【摘要】：动力本构模型UE模型具有可以描述非对称循环荷载、记忆量小、模型参数物理意义明确、表达式简单等优点。但其描述等幅循环荷载作用下的土体滞回圈时,存在非对称性,并且无法较好地拟合土体动阻尼比随应变产生的变化规律。通过在UE模型的骨架曲线中引入两个瞬变参数,利用"massing二倍法"构造滞回曲线,使模型同时满足各个应变下的剪切模量及阻尼比,确定瞬变参数的表达式,将瞬变参数表达式带入滞回曲线方程中,即得到最终的滞回曲线表达式,并定义各个滞回圈顶点的连线为此修正模型的实际骨架曲线。分析结果表明,该修正模型能够克服UE模型存在的不足,且更符合实际。
[Abstract]:The dynamic constitutive model UE model has the advantages of describing asymmetric cyclic load, small memory, clear physical meaning of model parameters, simple expression and so on.However, when describing the hysteresis loop of soil under constant amplitude cyclic load, there is asymmetry, and the variation of dynamic damping ratio of soil with strain can not be fitted well.By introducing two transient parameters into the skeleton curve of the UE model, the hysteretic curve is constructed by using the "massing double method". The model satisfies the shear modulus and damping ratio of each strain at the same time, and the expression of the transient parameter is determined.The transient parameter expression is introduced into the hysteretic curve equation, that is, the final hysteretic curve expression is obtained, and the line of each hysteretic loop vertex is defined to modify the actual skeleton curve of the model.The results show that the modified model can overcome the shortcomings of UE model and is more practical.
【作者单位】： 中国地震局工程力学研究所;防灾科技学院;
【基金】：中国地震局工程力学研究所基本科研业务费专项(2013C02) 黑龙江省科学基金(QC2012C105) 国家自然科学基金项目(50978237)
【分类号】：TU435
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本文编号：1759782