体外预应力桥梁三维有限元仿真及力学性能分析  

3D Finite Element Simulation and Mechanical Behavior Analysis for External Prestressed Bridges

作　　者：陈可[1] 宋建永[1] 潘学政[2] 陈国强[2] 李学斌[3] 

机构地区：[1]交通运输部公路科学研究院,北京100088 [2]杭州市公路管理局,浙江杭州310030 [3]中国铁道科学研究院,北京100081

出　　处：《公路交通科技》2012年第2期77-81,共5页Journal of Highway and Transportation Research and Development

基　　金：交通运输部西部交通建设科技项目(200831822373)

摘　　要：介绍了体外预应力桥梁的有限元分析方法,基于ANSYS二次开发了体外预应力桥梁有限元分析模块,能够计入材料与几何非线性影响,可用于分析体外预应力结构的极限承载力和局部受力特征。利用开发的模块,建立体外预应力桥梁的有限元模型,利用Solid65结合Solid45单元模拟混凝土,利用Link8模拟预应力束。在此基础上,通过对体内束和体外束的不同比例的配束方案的体外预应力混凝土桥梁力学性能分析,研究配束方案对极限承载能力的影响。分析结果表明,适当配置有粘结预应力对改善体外预应力桥梁的极限承载能力有较大的作用,可增加混凝体塑性变形的范围。因此,可选用适当的体外束和体内束的配合比,以获得更好的力学性能。The finite element analysis method for external prestressed concrete bridge was introduced. The finite element analysis module for external prestressed bridge was redeveloped based on ANSYS software. It is able to bring material and geometric nonlinear effects into the analysis, and for analyzing ultimate bearing capacity and local stress characteristics of external prestressed structure. Combined this module with Solid65/ Solid45 simulated concrete and Link8 simulated prestressed tendon, the external prestressed bridge finite element model was built. Then, the model equipped with different allocation arrangements of internal and external tendons to analyze the mechanical behavior of external prestressed concrete bridge. Thus, the effect of allocation arrangement of tendons on ultimate bearing capacity was analysed. The analysis result shows that proper configuration of bounded prestress is great effective to improve the ultimate bearing capacity of external prestressed bridge and to extend plastic deflection range. Therefore, better mechanical behavior could be obtained by choosing suitable mixed proportion of external and internal tendon arrangement.

关 键 词：桥梁工程 力学性能 有限元仿真 体外预应力 软件开发 

分 类 号：U448.35[建筑科学—桥梁与隧道工程]