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为计算大跨柔性混凝土结构的力学响应,常需同时进行非线性与混凝土收缩徐变分析。基于非线性分析的虚功增量方程和混凝土收缩徐变的本构关系导出了用于非线性与收缩徐变耦合计算的混凝土收缩徐变分析的虚功增量方程,并将该虚功增量方程应用于杆系结构,结合拖动坐标法建立了非线性有限元格式的不平衡力的计算方法。通过算例表明,该文方法能够同时计算结构的非线性效应和收缩徐变效应,并且解的精度取与非线性的分析精度相同。
In order to calculate the mechanical response of long-span flexible concrete structures, nonlinear and concrete shrinkage and creep analysis are often required. Based on the nonlinear analysis of the kinematic incremental equations and the concrete shrinkage and creep constitutive relations, the nonlinear function of the concrete shrinkage and creep analysis for nonlinear and shrinkage and creep coupling calculation of virtual work incremental equations, and the virtual work by The equation of mass is applied to the rod system, and the method of calculating the unbalance force in the nonlinear finite element method is established by using the drag coordinate method. A numerical example shows that the proposed method can simultaneously calculate the nonlinear effect and the shrinkage and creep effect of the structure, and the accuracy of the solution is the same as that of the nonlinear analysis.