基于热点应力的波形钢腹板梁疲劳分析  

Fatigue Analysis of Beam with Corrugated Steel Webs Using Hot Spot Stress Method

作　　者：彭鲲[1] 李立峰[1] 裴必达[1] PENG Kun;LI Lifeng;PEI Bida(College of Civil Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2018年第9期74-82,共9页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51278183)~~

摘　　要：现行桥梁设计规范没有对波形钢腹板梁的疲劳设计进行规定.为了研究这类结构的疲劳评估和设计方法,对7根波形钢腹板试验模型梁进行了等幅疲劳荷载试验,获得了结构的疲劳试验数据;应用有限元子模型法,结合IIW规程推荐的应力线性外推法,计算了模型梁的热点应力集中系数,基于热点应力法评价了本文试验及其它两个试验中波形钢腹板梁的疲劳性能,结果表明:热点应力法能较好地应用于波形钢腹板疲劳评估中,FAT值建议采用100MPa.波形钢腹板梁有限元参数分析表明:最大热点应力及其集中系数受钢翼缘板厚度和腹板波折角度影响较大,随板厚增大而减小,随波折角度增大而增大;受腹板转角半径影响较小,随转角半径增大而减小.At present,there is no bridge design code to guide the fatigue design of beam with corrugated steel webs.In order to study the fatigue design and evaluation methods of this structure,constant amplitude fatigue load tests of 7 beams were performed,and the basic fatigue data were obtained.Based on the FEM sub model method and the linear extrapolation method recommended by the IIW,the hot spot stress concentration factor of model beams was calculated.The fatigue performance of tested beams in this paper and other two tests was estimated by the hot spot stress method.The results show that the hot spot stress method is safe in evaluating the fatigue test results of the beams with corrugated steel webs and the 100 FAT class is recommended for fillet welds in this structure.The parameter analysis indicates that the largest hot spot stress and its concentration factor is greatly influenced by steel flange thickness and web corrugation angle,and they decrease with the increment of steel flange thickness and increase with the increment of web corrugation angle,while they are less affected by the web corner radius and decrease with the increment of web corner radius.

关 键 词：桥梁工程 疲劳性能 模型试验 波形钢腹板梁 热点应力 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]