论文部分内容阅读
钢管混凝土框架柱计算长度是合理正确计算其承载力的重要参数,是进行钢管混凝土结构内力分析和设计必不可少的参数,因缺乏系统研究,现行钢管混凝土框架柱计算长度暂参照钢框架柱取值,由于两种结构体系受力特性的差异会导致结果不合理。该文基于ABAQUS软件,通过合理选取钢管混凝土框架的稳定简化模型,同时考虑几何非线性和材料非线性的影响对框架体系进行非线性屈曲分析,从而求解有侧移和无侧移钢管混凝土框架柱计算长度。在此基础上通过大量参数分析,分别得到了有侧移和无侧移钢管混凝土框架柱计算长度系数表,并回归了简化计算公式。为比较不同方法计算结果的差异,选取某四层四跨钢管混凝土框架典型算例进行比较,结果表明:该文考虑初始缺陷和非线性行为所得到的计算长度系数取值方法比现行按采用钢框架柱计算方法的结果偏大,无侧移框架柱变化范围为0.97%~4.05%,有侧移框架柱变化范围为9.95%~27.17%,可见材性差异及初始缺陷对计算长度系数影响较大,不可忽视。
The calculation of the length of CFST column is an important parameter to calculate its bearing capacity reasonably and correctly. It is an indispensable parameter to analyze and design the internal force of CFST structure. Due to the lack of systematic research, the calculated length of the CFST frame column is based on the steel frame column Value, due to the difference between the two structural system stress characteristics will lead to unreasonable results. Based on the ABAQUS software, the nonlinear simplified buckling analysis of the frame system is carried out by reasonably choosing the simplified and simplified model of the concrete-filled steel tube (CFST) frame and considering the influence of geometric nonlinearity and material nonlinearity. Calculate length. On this basis, through a large number of parameter analysis, the calculation of the length coefficient table of concrete-filled steel tubular columns with lateral displacement and no lateral displacement are obtained, and the simplified calculation formula is returned. In order to compare the difference between the calculated results of different methods, a four-span four-span CFST frame is selected and compared. The results show that the method of calculating the length coefficient considering the initial defect and the nonlinear behavior is more effective than the existing steel The results of the calculation method of frame columns are large, the range of frame without lateral movement is 0.97% ~ 4.05%, and the range of frame columns with lateral displacement is 9.95% ~ 27.17%. The difference of material properties and initial defects affect the calculation of length coefficient Large, can not be ignored.