氯盐腐蚀环境下波形腹板钢箱组合梁疲劳性能试验研究  

Experimental Study on Fatigue Performance of Box Composite Girder with Corrugated Steel Webs in Chloride Salt Environment

作　　者：张紫辰 张豪 宁鑫 ZHANG Zichen;ZHANG Hao;NING Xin(School of Civil Engineering and Water Resources,Qinghai University,Xining Qinghai 810016,China;School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou Gansu 730070,China)

机构地区：[1]青海大学土木水利学院,青海西宁810016 [2]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《中国铁道科学》2024年第5期101-109,共9页China Railway Science

基　　金：甘肃省重大科技专项计划项目(19ZD2GA002);甘肃省交通厅资助项目(2020-05)。

摘　　要：为揭示氯盐腐蚀环境下波形腹板钢箱组合梁的疲劳性能,设计制作2片简支组合箱梁缩尺模型,分别进行常幅和分级变幅疲劳试验,研究未腐蚀和腐蚀模型梁的疲劳性能,基于非线性损伤理论进行波形腹板钢箱组合梁的疲劳损伤及疲劳寿命预测。结果表明:未腐蚀和腐蚀组合箱梁在经历200万次常幅循环加载后均未发生疲劳破坏,疲劳荷载引起的弯曲附加变形随加载循环次数的增加而增大;弯矩作用下组合梁满足“拟平截面假定”;未腐蚀梁和腐蚀梁分别经历了314.6万次和288万次分级变幅循环加载后发生疲劳破坏,试验梁底板与左右两侧腹板焊缝折角处是该类组合箱梁的疲劳易损部位;考虑多级变幅荷载相互作用影响的改进Corten-Dolan模型能够较好地预测波形腹板钢箱组合梁的疲劳寿命,且多级变幅荷载之间的相互作用对结构疲劳寿命的影响随腐蚀程度的增大而减小。In order to reveal the fatigue performance of box composite girder with corrugated steel webs under chloride corrosion environment,two scaled models of simply supported composite box girders were designed and fabricated,and constant amplitude and graded amplitude fatigue tests were conducted respectively to study the fatigue performance of uncorroded and corroded model girder.Based on nonlinear damage theory,the fatigue damage and fatigue life prediction of box composite girder with corrugated steel webs were carried out.The research results indicated that both uncorroded and corroded composite box girders did not experience fatigue failure after 2 million cycles of constant amplitude loading,and the additional bending deformation caused by fatigue loading increased with the increase of loading cycles;under the action of bending moment,the composite girder satisfies the“pseudo plane section assumption”;the uncorroded girder and corroded girder experienced fatigue failure after 3.146 million and 2.88 million graded variable amplitude cyclic loading,respectively.The welded joints at the corners of the test beam bottom plate and the left and right web plates are the fatigue vulnerable parts of this type of composite box girder;The modified Corten-Dolan model considering the interaction of multi-stage variable amplitude loads can effectively predict the fatigue life of box composite girder with corrugated steel webs;the influence of the interaction between multi-stage variable amplitude loads on the fatigue life of structures decreases with increasing corrosion severity.

关 键 词：波纹腹板钢箱组合梁 氯盐腐蚀 疲劳性能 疲劳损伤 疲劳寿命 疲劳试验 

分 类 号：U448.21[建筑科学—桥梁与隧道工程]