考虑循环软化的非线性界面本构模型研究 English Version
Research on nonlinear constitutive model of interface considering cyclic softening
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摘要: 提出一种考虑循环软化、非线性的无厚度界面本构模型。首先,开展了砂土-钢界面的大型循环剪切试验研究,获取了界面循环剪切下强度参数指数型的软化规律,提出了考虑土体相对密实度和结构粗糙度耦合作用的循环软化表征方程;其次,将引入循环软化方程的双曲线模型作为骨架曲线模型,实现循环荷载作用下界面从初始状态演变至临界状态的模拟;最终,考虑界面剪切的非线性,构造了剪应力-剪位移的滞回圈模型,并总结了模型的强度参数、刚度参数与法向应力、土体相对密实度、结构粗糙度的经验公式。采用新建立的模型对本文试验结果和既有文献结果进行了预测,证明了其对界面循环剪切试验具有良好的拟合效果。Abstract: A zero-thickness interface constitutive model that considers cyclic softening and nonlinearity was proposed. Firstly, large-scale cyclic shear tests were conducted on the sand-steel interface to obtain the exponential softening law of strength parameters under cyclic shear. A cyclic softening equation considering the coupling effect of soil relative density and structural roughness was proposed; Secondly, the hyperbolic model incorporating the cyclic softening equation was used as the skeleton curve model to simulate the evolution of the interface from the initial state to the critical state under cyclic loading; Finally, considering the nonlinearity of interface shear, a hysteresis loop model of shear stress-shear displacement was constructed. In addition, empirical formulas for the strength parameters, stiffness parameters, normal stress, relative soil density, and structural roughness of the model were summarized. The newly established model was used to predict the experimental results of this paper and existing literature results, demonstrating its good fitting effect on the interface cyclic shear test.
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Keywords:
- sand-steel interface /
- cyclic softening /
- relative compactness /
- roughness /
- constitutive model
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