超静定结构徐变效应的力法分析方法

Creep analysis of statically indeterminate structure by force method

根据静定结构分别承受常荷载和变荷载时考虑徐变的受力和变形规律,基于力法和龄期调整的有效模量法,给出了超静定结构考虑施工过程和徐变影响的内力分析方法。该法去掉超静定结构中的多余约束,使原结构等效为一个同时承受外荷载、弹性多余力和随时间变化的徐变多余力的静定结构称为基本结构。对基本结构分别进行承受每种力作用时的徐变分析,得到相应的在多余力方向上的位移。根据多余力处的变形协调条件列出并求解力法平衡方程得到徐变多余力。此外,对其中一个算例进行徐变分析,得出各相关因素对结构受力的影响。

According to the creep behavior of statically, structure under constant load and changing load were determined, respectively, the internal analysis method of statically indeterminate structure considering the effects of construction and creep was presented. This method is based on the ideas of force method and age- adjusted effective module method. By removing redundant restraints, the initial structure is equivalent to a statically determinate structure, named released structure, which subjects to loads, redundant forces obtained in elastic analysis and creep - redundant force changing with time due to the creep of structure. Displacements on the directions of redundant forces can be obtained by creep analysis of released structure under every force mentioned above. According to conformability of deformation, creep - redundant forces can be attained by resolving equilibrium equations. Effects of relevant factors on the statically indeterminate structure were presented through a numerical example.