连续箱梁桥构件易损性及重要性的评价方法  

Evaluation Method of Vulnerability and Importance of Bridge Components in Continuous Box Girder Bridge

作　　者：杜连玉 李兆霞[1] DU Lian-yu;LI Zhao-xia(School of Civil Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学土木工程学院,南京市210096

出　　处：《公路》2022年第7期157-161,共5页Highway

基　　金：国家自然科学基金项目,项目编号51678135。

摘　　要：为了有效评价连续箱梁桥易损关键构件,基于极限应变能理论,提出了连续箱梁桥构件的易损性评价指标;以广义结构刚度的损失率作为构件重要性指标,开发了连续箱梁桥构件的重要性分析与评估程序,计算了不同分布形式荷载作用下桥梁构件的易损性及重要性系数。研究结果表明,提出的构件广义应变比能作为易损性评价指标,可以有效发现结构易损构件;基于包络思想的桥梁构件重要性评价程序考虑了结构属性和变荷载作用,可以有效评估构件重要性;结合构件易损性分析和重要性分析,可以快速发现结构易损关键构件。In order to evaluate the vulnerable key components of continuous box girder bridge effectively, based on the ultimate strain energy theory, the vulnerability evaluation index of continuous box girder bridge members is proposed. Taking the loss rate of generalized structural stiffness as the component importance index, a component importance analysis and evaluation program for continuous box girder bridges is developed, and the vulnerability and importance coefficients of bridge components under different distributed loads are calculated. The research results show that the proposed generalized strain ratio of components can be used as a vulnerability evaluation index, which can effectively find structural vulnerable components;the importance evaluation program of bridge components based on the enveloping idea considers structural properties and variable load effects, and can effectively evaluate the importance of components. Combined with component vulnerability analysis and importance analysis, key structural vulnerable components can be quickly found.

关 键 词：连续箱梁桥 易损关键构件 构件易损性 广义结构刚度 构件重要性 广义应变比能 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]