L形钢管混凝土柱轴压承载力计算  

Bearing capacity calculation of L-shaped concrete filled steel tubular columns subjected to axial compression

作　　者：屠永清[1] 文千山 

机构地区：[1]北京航空航天大学交通科学与工程学院,北京100191 [2]中国五洲工程设计集团有限公司,北京100053

出　　处：《建筑结构学报》2013年第S1期314-320,共7页Journal of Building Structures

基　　金：国家自然科学基金项目(51278019)

摘　　要：为研究L形钢管混凝土柱在轴心受压荷载作用下的力学性能和承载力计算方法,建立L形钢管混凝土柱轴压下的有限元模型,并将有限元分析结果与文献中的试验结果进行了对比,二者吻合较好。通过对其短柱进行有限元模拟,分析了短柱的工作机理以及材料强度、含钢率、柱肢长宽比等参数对其轴压承载力的影响。研究表明:当柱肢的长宽比为2.5左右时,钢管对混凝土的约束作用最好。基于统一理论,以约束效应系数为参数,提出了L形钢管混凝土柱轴压强度承载力计算方法。在有限元模拟的基础上,分析了长柱的失稳方向问题及影响稳定系数的主要因素,提出L形钢管混凝土柱轴压稳定承载力计算方法,建议的承载力计算方法与有限元分析结果符合较好。In order to study the mechanical properties and calculation methods of the bearing capacity of L-shaped concrete filled steel tubular columns under axial compression,a finite element model for the simulation study was established and the simulation results were proved in good agreement with experimental results reported in literatures.By a large number of finite element simulations of stub columns,working mechanism of the stub column and the influence of various parameters,such as material strength,steel ratio and length-to-width ratio of column flange,on the strength of stub columns were investigated.It is shown that the confining effect of the steel tube on the concrete is best when the length-to-width ratio of the column flange is about 2.5.With reference to the unified theory,taking confining coefficient as a parameter,a simplified formula for the strength capacity of L-shaped concrete filled steel tubular columns under axial-compression was developed.Furthermore,by a large number of finite element simulations of long columns,the direction in which the column may lose stability and the main factors affecting the buckling coefficient were investigated.A simplified formula for the stability capacity was recommended.The calculation results from the proposed formula agreed well with the simulation results.

关 键 词：钢管混凝土L形截面柱 轴压 有限元分析 承载力 

分 类 号：TU398.9[建筑科学—结构工程]