钢管混凝土单圆管拱空间受力双重非线性有限元分析  

Nonlinear Finite Element Analysis of Concrete Filled Steel Tubular (Single Tube) Arch Subjected to Spatial Loads

作　　者：陈宝春[1] 林嘉阳[1] 

机构地区：[1]福州大学土木建筑工程学院,福建福州350002

出　　处：《铁道学报》2005年第6期77-84,共8页Journal of the China Railway Society

基　　金：福建省重大科技项目(2003F007);交通部西部交通科技项目(2003-318-798-20-1)

摘　　要：提出钢管混凝土拱(单圆管)空间受力的双重非线性有限元分析方法并编制了有限元程序。有限元建模时采用空间梁单元。材料非线性中正应力-正应变关系采用纤维单元模型,剪应力-剪应变关系采用统一理论的标准曲线。应用该方法对钢管混凝土单肋模型拱和双肋模型拱进行了分析,并对非线性性能和横向力作用进行了分析。分析结果表明,本文提出的方法能较好地反映钢管混凝土拱空间受力全过程的非线性性能。在空间荷载作用下,钢管混凝土拱的几何非线性影响要大于材料非线性的影响;单肋拱的空间受力的特征要明显大于双肋拱。A method to analyze the dual nonlinearity behaviors of CFST （single tube） arch subjected to spatial loads is presented. Spatial beam element is used in the finite element model. The fiber element model is used for the normal stress-strain relation and the standard curve in the unify theory of CFST is used for the shear stress-strain relation. The analyses of the nonlinear property of the CFST model arches both with a single rib and two ribs indicate that the method proposed herein can get out the basic mechanic behaviors of the steel tubular CFST arch subjected to spatial loads on the whole loading progress. Under the spatial loads, the affection of the geometric nonlinearity to the behaviors of CFST arch is more seriously than the material nonlinearity. The spatial actions of the CFST arch with single rib is obviously great than that with double ribs.

关 键 词：钢管混凝土 拱 空间 非线性 有限元 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]