论文部分内容阅读
本文采用杆系有限单元逐步增量法计算超静定结构预应力组合截面的收缩、徐变内力重分布。砼徐变随时间变化规律采用 Trost 公式。弹性压缩、砼的收缩、徐变和钢筋松弛应力损失在编制程序中可自动得到计算。对于组合截面的杆件单元,利用在结合面上的变形协调条件,先求出结合面上的弯矩和轴力,再移到组合截面的重心轴上作为节点外荷载来分析超静定结构的次内力。此时导入徐变换算截面特性概念,将复合构件取作为单一构件进行计算。全部计算在 IBM 微机上进行,文中列出了计算程序的粗框图。
In this paper, the finite element incremental unit method is used to calculate the shrinkage and creep internal force redistribution of the prestressed composite sections of statically indeterminate structures. Concrete creep changes with time using Trost formula. Elastic compression, concrete shrinkage, creep and relaxation stress relaxation in the preparation process can be automatically calculated. For the rod element with combined section, using the deformation coordination condition on the joint surface, the bending moment and axial force on the joint surface are first calculated and then moved to the gravity center axis of the combined section to analyze the statically indeterminate structure The secondary internal force. In this case, the concept of creep transformation section properties is introduced, and the composite component is taken as a single component. All calculations are performed on an IBM microcomputer, which lists the thick block diagram of the calculation program.