均匀腐蚀下钢底板波形钢腹板组合梁疲劳损伤分析  

Fatigue Damage Analysis of Composite Girder with Steel Bottom Plate and Corrugated Steel Webs Under Uniform Corrosion

作　　者：韩溥禄 王根会[1] HAN Pulu;WANG Genhui(Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学,甘肃兰州730070

出　　处：《桥梁建设》2025年第2期73-79,共7页Bridge Construction

基　　金：甘肃省重大科技专项计划项目(19ZD2GA002);甘肃省公路混凝土桥梁全寿命设计与应用技术研究项目(2020-05);甘肃省重点研发计划-工业领域资助项目(25YFGA051)。

摘　　要：为了解均匀腐蚀对钢底板波形钢腹板组合梁疲劳损伤的影响,采用模型试验和理论分析进行研究。分别设计、制作缩尺比为1∶8.82的未腐蚀、盐腐蚀(均匀腐蚀)组合箱梁各1片,进行疲劳试验及静力试验,结合疲劳损伤理论,对比分析组合梁的试验现象、应力发展及疲劳损伤情况。结果表明:盐腐蚀梁底板的腐蚀现象明显,需重点关注,未腐蚀梁与盐腐蚀梁的疲劳破坏现象相同,均为跨中截面底板与腹板交界面处的焊点疲劳破坏,说明均匀腐蚀不会影响该交界面的焊缝成为疲劳破坏的疲劳源;盐腐蚀梁较未腐蚀梁的底板应力值更大,说明均匀腐蚀会增大同级荷载下梁体的疲劳损伤,使梁体的疲劳损伤提前发生;当锈蚀率小于20%时,盐腐蚀梁的疲劳损伤随锈独率增长整体呈现指数态势增长,锈蚀率越大这种增长越明显。This study investigates the influence of uniform corrosion on the fatigue damage of the composite girder with steel bottom plate and corrugated steel webs.An uncorroded composite box specimen and a salt-corroded(uniform corrosion)composite box specimen were designed and prepared for the fatigue and static tests,both fabricated at a scale of 1∶8.82.The test phenomena,stress development and damage conditions were compared with the theoretical analysis results.It is concluded that the salt-corroded composite girder is with obvious corrosion in the steel bottom plate,which should be given great concern.The fatigue damages of the uncorroded girder and the salt-corroded girder are similar,all are the fatigue damages at the welding points in the interface of the midspan steel bottom plate and the webs,indicating that uniform corrosion will not influence the welded joints at the steel-concrete interface and become the source of damages.The salt-corroded girder reveals greater stresses in the steel bottom plate than those in the uncorroded girder,suggesting that uniform corrosion enlarges the fatigue damages of the girder under the same level of loads and accelerates the occurrence of fatigue damages.When the corrosion rate is below 20%,the fatigue damage of the salt-corroded girder grows exponentially as the corrosion rate increases,and the greater the corrosion rate,the more significant the fatigue damage would be.

关 键 词：钢底板波形钢腹板组合梁 均匀腐蚀 锈蚀率 疲劳损伤 疲劳试验 静力试验 

分 类 号：U448.216[建筑科学—桥梁与隧道工程] U441.4[交通运输工程—道路与铁道工程]