钢管混凝土拱桥施工及营运阶段非线性应力分析  

Nonlinear Stress Analysis of CFST Arch Bridge in Construction and Service

作　　者：陈世民[1,2] 张飞[2] 白云[2] 

机构地区：[1]重庆大学,重庆400045 [2]重庆交通大学,重庆400074

出　　处：《公路交通科技》2009年第1期93-98,共6页Journal of Highway and Transportation Research and Development

摘　　要：为进一步研究几何非线性、材料非线性及其组合对钢管混凝土拱桥受力特性的影响,以及钢管混凝土拱桥从转体施工到合龙,直至运营阶段的受力特性,使用有限元软件MSC.NASTRAN建立其全桥空间有限元模型,并在建模过程中力求减少假设、逼近真实工程结构状态,对该桥在施工过程及营运阶段的力学行为进行研究。考虑多种荷载组合,与施工过程相对应地分阶段地对结构进行加载,分别考虑线弹性、几何非线性、材料非线性以及双重非线性的影响对模型进行分析计算。对比相同非线性组合状态下不同阶段的受力特性以及相同阶段不同非线性组合的受力特性,得出一些有益结论,包括各阶段结构的受力薄弱位置所在,各阶段各非线性因素的影响的重要性等。For the purpose of further research into CFST arch bridge＇ s responses against geometrical nonlinearity, material nonlinearity as well as their combinations and into the mechanical features of the CFST arch bridge in the construction process and serving phase, 3D finite element model were built by using software MSC. NASTRAN. In modeling process, to approximate the real engineering structure, the using of hypotheses was reduced to the best. Loading simulation for different phases was conducted considering all the nonlinearity combinations above. By comparing the mechanical behaviors brought on by different phases with same nonlinearity combination and same phase with different nonlinearity combinations, some important conclusions were obtained, including where the weakest component is and how important the nonlinearity is, and so on.

关 键 词：桥梁工程 钢管混凝土拱桥 有限元 应力分析 非线性 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]