基于有限元的在役桥梁纵向刚度修正法  

A longitudinal stiffness correction method based on finite element for in-service girder bridge

作　　者：王凌波[1] 贺拴海[1] 蒋培文[1] 

机构地区：[1]长安大学桥梁与隧道陕西省重点实验室,陕西西安710064

出　　处：《合肥工业大学学报（自然科学版）》2011年第11期1701-1705,共5页Journal of Hefei University of Technology：Natural Science

基　　金：交通部西部交通建设科技资助项目(200731881232)

摘　　要：根据平截面假定及有限元基本原理,推导梁桥纵梁刚度分段求解方程组。文章利用静力测试参数稳定、可靠、准确的良好属性,借助室外实梁试验,修正桥梁纵向刚度,验证算法的有效性。结果表明:该算法推出的纵梁刚度与实际刚度吻合良好;可计算纵梁由于各类损伤所带来的刚度缺失,有效锁定损伤范围,估算损伤程度,判别纵梁整体损伤状况。经对比分析表明,该算法比规范算法具有更高精度,能够更加真实、可靠地反映在役桥梁整体损伤状况,便于广大工程人员识别桥梁不可见损伤区域,综合评估桥梁损伤程度。According to＇ plane cross-section assumption and finite element theory, the section solving equations of longitudinal stiffness are deduced. As static test parameters has good properties such as being stable, reliable and accurate, the real beam outdoor test is implemented to correct longitudinal stiffness of the bridge and verify this new algorithm. The experimental results show that the deflection theoretical values at each measure point in longitudinal beam, which is calculated by the new algorithm, match well with the experimental ones. This method can be used to calculate longitudinal stiffness lack caused by all kinds of damage, lock the damage range quickly, estimate the damage degree effectively, and distinguish the damage condition of the whole longitudinal beam accurately. The comparative and analytical results indicate that the stiffness calculated by the new algorithm has higher precision than that calculated according to related standard, and it can reflect the whole damage status of in-service bridges veritably and reliably. So it is convenient for the engineers to identify invisible bridge damage area and evaluate the damage degree of bridge comprehensively.

关 键 词：纵向刚度 桥梁检测 有限元 不可见损伤 

分 类 号：U446[建筑科学—桥梁与隧道工程]