寿命期内混凝土桥梁性能演变分析  

Structural performance assessment of concrete bridges in life-cycle

作　　者：田浩[1,2] 陈艾荣[1] 陈亮 

机构地区：[1]同济大学桥梁工程系,上海200092 [2]浙江省交通科学研究所,浙江杭州310006

出　　处：《浙江大学学报（工学版）》2012年第1期52-57,共6页Journal of Zhejiang University：Engineering Science

基　　金：西部交通建设科技资助项目(2006 318 223 02-01)

摘　　要：为了定量分析寿命期内混凝土桥梁整体力学性能的演变过程,在重点解决退化过程中材料力学性能劣化、截面面积削弱和结构整体力学性能演变等力学问题数值模拟方法的基础上,建立基于有限元的混凝土桥梁性能演变分析方法,利用Fortran 95编写相应的分析程序.以一座3m×25m预应力混凝土连续梁为对象,研究模型梁在氯离子侵蚀环境中结构整体力学性能的演变规律.结果表明,混凝土截面开始削弱后考虑和不考虑环境作用的结构响应差异逐渐明显,成桥60a后考虑环境作用的混凝土正应力不满足规范要求.对于预应力混凝土桥梁,当预应力钢筋不发生锈蚀时混凝土截面的削弱是引起结构整体力学性能演变的主要原因,预应力混凝土桥梁的正常使用极限状态有可能出现耐久性不足的问题.Some mechanics problems in the degradation process,such as deterioration of materials properties,reduction of section areas,and the variation of overall structural performance were solved in order to evaluate the lifetime performance of concrete bridges.A finite element-based analysis method related to the lifetime performance of concrete bridges was proposed and the corresponding program was written in Fortran 95.The variation of structural performance of a 3 m×25 m prestressed concrete continuous girder bridge exposed to chloride penetration environment was analyzed.Results show that the differences with respect to various structural responses with and without environmental effect are gradually significant after the reduction of concrete section.Concrete normal stress cannot meet the standard requirement after 60 years of structure completion.In the case of prestressed concrete bridges,the essential ingredient related to the variation of structural performance is the reduction of concrete section when the prestressing steel doesn＇t corrode.The deficiency of durability is more likely to appear for the serviceability limit state with respect to prestressed concrete bridges.

关 键 词：混凝土桥梁 寿命期 性能演变 Fortran95 氯离子侵蚀 

分 类 号：TU375.4[建筑科学—结构工程]