高层框架考虑施工过程和徐变收缩影响的受力分析

位移法分析超静定结构徐变收缩效应的关键是求单元的徐变收缩固端力。首先根据力法和虚功原理,推导出杆件单元徐变固端力和收缩固端力的计算公式。然后给出了高层框架结构分析中考虑施工过程和徐变收缩影响的方法,并列出了位移法方程。用FORTRAN语言编制了高层结构徐变收缩分析的计算机程序,并对一个高层框架进行结构分析。结果表明,施工过程和徐变收缩对高层框架的受力和变形影响都较大,实际工程设计中应该考虑这些因素对结构的影响。

ANALYSIS OF HIGH-RISE FRAME STRUCTURES WITH CONSTRUCTION PROCESS, CREEP AND SHRINKAGE EFFECTS

The key problem for displacement method in creep and shrinkage effect analysis of statically indeterminate structures is to determinate inelastic fixed-end forces caused by creep and shrinkage of the element. Based on the concepts of force method and virtual-work principle, calculation formulae of the inelastic fixed-end forces in structure elements are deduced. The methods for considering the effects of construction process, creep and shrinkage in the analysis of high-rise frame structures are then introduced. The corresponding computational procedure was programmed using FORTRAN language. Creep and shrinkage analysis of a frame structure was conducted by using this program. The results show that creep, shrinkage and construction process have great effects on the mechanical and deformational performances of high-rise frame structures. These effects should be taken into accounts in the design of high-rise frame structures.