初应力对钢管混凝土轴压构件受力性能的影响  

Influence of initial stress to behavior of concrete filled steel columns under axial loads

作　　者：黄福云[1] 陈宝春[1] 

机构地区：[1]福州大学土木工程学院,福建福州350002

出　　处：《福州大学学报（自然科学版）》2008年第2期272-277,共6页Journal of Fuzhou University(Natural Science Edition)

基　　金：福建省重大科技资助项目(2003F007)

摘　　要：进行了初应力对钢管混凝土轴压构件受力性能影响的试验研究,提出了有限元计算方法,以初应力度与长细比为参数探讨了有初应力构件的力学性能.分析结果表明,初应力使构件弹塑性阶段提前、弹性极限荷载降低,同时极限荷载推迟出现,构件切线刚度降低.钢管混凝土轴压构件极限承载力随着初应力度的增大而降低,降低幅度随着长细比的增大而增大,但这种降低作用并不显著.Experimental research on concrete filled steel tubular （CFST） columns with initial stresses subjected to axial loads is carried out. Finite element method for analysis of such columns is presented. The influences of initial stress degree and slenderness ratio to the behaviors are analyzed. Analysis results indicate that initial stress make the elastic -plastic phase appeared ahead and the tangent stiffness and elastic ultimate load decreased as well as the ultimate load appeared postponing of the members. The ultimate load -carrying capacity of CFST columns subjected to axial compression will decrease with the increase of the initial stress ratio, and this descending will be intensified with the increase of slenderness ratio. As general speaking, this descending effects by initial stresses are not seriously.

关 键 词：钢管混凝土 初应力 长细比 极限承载力 有限元 

分 类 号：TU398[建筑科学—结构工程]