超限超载交通对桥梁疲劳损伤及可靠度的影响  

Effect of overrun and overloaded vehicles on fatigue damage and reliability of highway bridges

作　　者：赵少杰[1,2,3] 任伟新 

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]湖南省交通规划勘察设计院,湖南长沙410008 [3]中南公路建设及养护技术湖南省重点实验室,湖南长沙410008 [4]合肥工业大学土木与水利工程学院,安徽合肥230009

出　　处：《中南大学学报（自然科学版）》2017年第11期3045-3051,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51278163)~~

摘　　要：为了简便、快速地评估交通荷载对桥梁结构疲劳损伤的影响,采用定性分析结合数据拟合的方法建立车辆荷载参数与结构疲劳损伤度之间的量化关系。根据疲劳极限状态方程,考虑到应力与内力的关系,获得疲劳损伤度与疲劳可靠度之间的关系,并进一步建立车辆荷载参数与结构疲劳可靠度之间的量化关系式,为准确、快捷地评估车辆荷载对结构疲劳损伤及可靠度的影响提供一种实用方法。根据该关系式,分析超载超限交通对结构疲劳可靠度的影响。研究结果表明:简支梁结构的疲劳可靠度随着荷载系数K的增大呈对数关系降低;较大的车辆轴距对降低结构的疲劳损伤、提高疲劳可靠度有利。In order to simply and rapidly evaluate the effect of traffic load on fatigue damage of highway bridges,the relationship between vehicle load parameters and fatigue damage of structures was established by using qualitativeanalysis and data fitting method. Based on the limit state equation of fatigue, and considering the relationship betweenstress and interforce, the relationship between fatigue reliability and fatigue damage was obtained, and then therelationship between vehicle load parameters and fatigue reliability of structures was established, which provided apractical and simple method to evaluate the effect of vehicle load on fatigue damage and the reliability of structures.Based on the formula, the influence of overrun and overloaded vehicles on fatigue reliability was analyzed. The resultsshow that the fatigue reliability of simple supported beam decreases in logarithmic form with the increase of the loadcoefficient K, and the larger wheel base is beneficial for decreasing fatigue damage and increasing fatigue reliability.

关 键 词：桥梁工程 疲劳可靠度 统计拟合 疲劳损伤 超载超限交通 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]