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基于粘结滑移理论和纤维模型建立了一个新的钢管混凝土桥墩单元,以提高钢管混凝土桥墩非线性分析的计算精度和计算效率。该单元是建立在小变形假定的基础上,同时忽略了剪切变形和扭转变形的影响。基于纤维模型的基本原理,将截面划分为不同的纤维组成,每根纤维的特性由材料的应力-应变本构关系描述,对截面上钢管、混凝土以及粘结滑移本构关系进行积分可以获得单元的非线性滞回特性;根据有限单元柔度法的基本理论,采用力的插值函数使单元始终满足轴力平衡和弯矩平衡条件。对比模型的计算结果和试验结果,可以看出本文模型具有良好的数值稳定性和鲁棒性,可以准确地计算钢管混凝土桥墩在复杂荷载作用下的滞回行为。最后本文对模型的适用性进行了讨论,分析了误差产生的原因并指出了需要进一步开展的工作。
Based on the theory of bond slip and fiber model, a new CFST pier unit is established to improve the calculation accuracy and computational efficiency of CFST pier nonlinear analysis. The unit is based on the assumption of small deformations while ignoring the effects of shear deformation and torsional deformation. Based on the basic principle of the fiber model, the sections are divided into different fiber compositions, and the characteristics of each fiber are described by the stress-strain constitutive relations of the materials. The integration of steel pipe, concrete and bond-slip constitutive relationship can be obtained According to the basic theory of finite element flexibility method, the force interpolation function is used to make the element always meet the conditions of axial force balance and moment balance. Comparing the calculation results with the experimental results, we can see that the model has good numerical stability and robustness, and can accurately calculate the hysteretic behavior of concrete filled steel tubular piers under complicated loads. Finally, the paper discusses the applicability of the model, analyzes the causes of errors and points out the work that needs to be further carried out.