钢管混凝土框架支撑结构二阶效应直接分析  

Direct analysis on second-order effects of concrete-filled steel tube concentrically braced frame

作　　者：赵根田 周伟 李补拴 李霈清 ZHAO Gentian;ZHOU Wei;LI Bushuan;LI Peiqing(Civil Engineering School, Inner Mongolia University of Science and Technology, Baotou 014010, China)

机构地区：[1]内蒙古科技大学土木工程学院,内蒙古包头014010

出　　处：《内蒙古科技大学学报》2021年第1期63-72,共10页Journal of Inner Mongolia University of Science and Technology

基　　金：国家自然科学基金资助项目(51268042).

摘　　要：为研究二阶效应对钢管混凝土框架中心支撑结构内力和变形的影响,以某高层钢管混凝土框架中心支撑住宅为例,通过设置假想水平力,引入结构和构件的初始几何缺陷以及残余应力,同时考虑P-Δ和P-δ效应,使用直接分析法对结构二阶效应进行分结果表明:整体缺陷加剧结构的二阶效应,产生的位移增量明显大于构件缺陷所产生的位移增量;考虑P-Δ-δ效应的柱弯矩远大于只考虑P-Δ效应的柱弯矩,但对剪力和轴力影响不明显.Taking a high-rise CFST concentrically-braced moment frame residence as an example,the initial geometric defects and residual stresses of the structure were introduced by setting up the imaginary horizontal force to study the influence of the second-order effect on the internal force and deformation of the concrete-filled steel tube(CFST)concentrically-braced frame.The results show that:the second-order effect of the structure is aggravated by the overall defect,and the displacement increment is obviously larger than that of the component defect.The bending moment of frame column by the direct analysis considering the P-Δ-δeffect is far larger than that of the second-order analysis only considering the P-δeffect,which has no obvious influence on the shear force and axial force.

关 键 词：框架 初始缺陷 二阶效应 直接分析 假想水平力 

分 类 号：TU398.9[建筑科学—结构工程]