南京长江大桥钢桥面板弧形缺口位置疲劳性能研究  

RESEARCH ON FATIGUE PERFORMANCE OF ARC-SHAPED NOTCH IN STEEL BRIDGE DECK OF NANJING YANGTZE RIVER BRIDGE

作　　者：王昊 吉伯海[1] 王秋东[1] 傅中秋[1] WANG Hao;JI Bohai;WANG Qiudong;FU Zhongqiu(College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学土木与交通学院

出　　处：《工业建筑》2018年第10期28-33,共6页Industrial Construction

基　　金：南京长江大桥公路桥维修改造工程科技项目

摘　　要：依托南京长江大桥公路正桥改造工程,建立了钢桥面板有限元节段模型,研究了车轮荷载作用下横隔板弧形缺口位置的变形及应力特征,确定了该细节的最不利荷载位置。在此基础上,研究了不同环境温度下弧形缺口位置的变形及应力特征,分析了环境温度变化对该细节疲劳性能的影响。研究表明：弧形缺口有效截面最小处应力最大,最不利荷载位置位于此点正上方;随着温度的升高,弧形缺口有效截面最小处的面内外变形、疲劳应力逐渐增大,且该位置应力梯度最大,受温度影响显著;相比于0℃,环境温度为40℃时弧形缺口有效截面最小处的疲劳应力增加了约30 MPa,故宜在高温季节后加强该位置的疲劳养护工作。A section model of steel bridge deck was developed by the finite element method based on the renewal scheme of Nanjing Yangtze River Bridge. The characteristics of both deformation and stress distribution around arcshaped notch were investigated,and the most critical loading position of the detail was determined. Besides,the effects of the environmental temperature on both deformation and stress distribution were considered. The results showed that the maximal stress appeared on the minimum effective section of arc-shaped notch and the most critical loading position located above the fatigue detail. The in-plane and out-of-plane deformation and the fatigue stress of the minimum effective section of arc-shaped notch increased with the increase of the temperature,and maximum stress gradient appeared on this fatigue detail. The fatigue stress of the minimum effective section of arc-shape notch increased by about 30 MPa in 40 ℃ compared to 0 ℃. The maintenance of the fatigue detail after the hot season was proposed.

关 键 词：钢桥面板 弧形缺口 疲劳性能 有限元模型 

分 类 号：U443.31[建筑科学—桥梁与隧道工程]