高坎桥正交异性钢桥面板的疲劳分析  

Fatigue Analysis of Orthotropic Steel Deck for Gaokan Bridge

作　　者：包龙生[1] 朱春莹[1] 于玲[1] 曹鑫[1] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《世界桥梁》2013年第6期39-42,共4页World Bridges

基　　金：住房和城乡建设部科学技术项目(2012-K2-31);高校优秀科技人才支持计划(LR2013025);辽宁省"百千万人才工程"入选项目择优资助(2012921047)

摘　　要：为了解正交异性钢桥面板的抗疲劳性能,以高坎桥为背景,采用MIDAS/FEA计算该桥桥面板主要构造细节的疲劳应力幅,运用线弹性断裂力学分析方法对横隔板的疲劳扩展寿命进行估算。计算结果表明,钢桥面板、纵肋和横隔板间的连接部位最大应力幅均小于常幅疲劳限值,但其中的横隔板弧形缺口边缘应力集中较严重。通过线弹性断裂力学疲劳分析,横隔板弧形缺口边缘裂纹长度从1mm扩展到临界裂纹尺寸553mm要经过1.23×106次应力循环。To Bridge was taken investigate the antifatigue property of the orthotropic steel deck, the Gaokan as the study background. The MIDAS/FEA was used to calculate the fatigue stress range of the main structural details of the bridge deck, and the analytical method in linear e lastic fracture mechanics was used to evaluate the fatigue propagation life of the diaphragms. The results of the calculation showed that the maximum stress range of the connecting parts between the steel bridge deck, stringers and diaphragms was less than the constant limit fatigue value. However, severe stress concentration occurred along the edge of the arcshaped notch in the dia phragms. According to the fatigue analysis based on the linear elastic fracture mechanics, only when experienced 1. 23 X 106 stress cycles could the crack length in the edge of the arcshaped notchs of the diaphragms propagate from 1 mm to the critical crack dimension of 553 mm.

关 键 词：正交异性钢桥面板 断裂力学 应力强度因子 疲劳寿命 分析 

分 类 号：U443.31[建筑科学—桥梁与隧道工程]