摘要
根据管涵受力特性研发FRPM管涵夹具,对变形率为0%、1%、2%及3%的试件进行10次、50万次、100万次与200万次循环荷载加载,分析变形率对FRPM管涵疲劳性能的影响;根据剩余刚度理论、线性疲劳损伤理论及疲劳试验结果,建立FRPM管涵的剩余刚度疲劳寿命预测模型。主要得出如下结论:①变形率影响试件的承载能力,变形率越大,试件经疲劳试验后其承载能力越低;②循环疲劳荷载作用次数的增加能够降低FRPM管涵的管刚度,当变形率为0%时,经过200万次的疲劳荷载作用,FRPM管涵试件的管刚度由50.71 kPa下降至46.05 kPa,下降了10.12%;③经疲劳荷载作用后,变形率降低了管涵的承载能力和管刚度,对于变形率为3%的管涵,经过200万次疲劳荷载作用后,管刚度降低24.44%;④试件各监测点位应变增长率与疲劳荷载作用次数成正相关,变形率越大,经过疲劳荷载作用后,其承载能力越低,疲劳作用次数越多,其承载能力降低越大;⑤建立基于剩余刚度的疲劳寿命预测模型,通过该模型预测变形率为0%、1%、2%和3%时FRPM管涵的疲劳寿命,变形率为0%时,FRPM管涵的疲劳寿命为1252.956万次,变形率为3%时,FRPM管涵的疲劳寿命为693.761万次,表明FRPM管涵具有良好的疲劳性能,疲劳寿命能够满足服役要求。
The FRPM pipe culvert fixture is developed according to the force characteristics of the pipe culvert,and the specimens with a deformation rate of 0%,1%,2%and 3%are subjected to 10 times,500000 times,1 million times and 2 million times of cyclic loading.The influence of deformation rate on the fatigue performance of FRPM pipe culvert is andyzed.According to the residual stiffness theory linear fatigue damage theory and fatigue test results,the residual stiffness fatigue life prediction model of FRPM pipe culvert is established.The main conclusions are as follows:①The deformation rate affects the load-bearing capacity of the specimen.The greater the deformation rate,the lower the load-bearing capacity of the specimen after the fatigue test.②The increase in the number of cyclic fatigue loads can reduce the FRPM pipe culvert when the deformation rate is 0%,after 2 million times of fatigue load,the pipe stiffness of FRPM pipe culvert specimen drops from 50.71 kPa to 46.05 kPa,a decrease of 10.12%.③After fatigue load,the deformation rate reduces the bearing capacity and stiffness of the pipe culvert.For a pipe culvert with a deformation rate of 3%,after 2 million fatigue loads,the stiffness of the pipe decreases by 24.44%.④The strain growth rate at each measurement point of the specimen is positively correlated with the number of fatigue loads.The greater the deformation rate,the lower the load-bearing capacity after the fatigue load,and the more the number of fatigue actions,the greater the reduction in its load-bearing capacity.⑤Establishing a fatigue life prediction model based on residual stiffness through the fatigue life prediction model.When the deformation rate is 0%,1%,2%and 3%,the fatigue life of FRPM pipe culvert,when the deformation rate is 0%,the fatigue life of FRPM pipe culvert is 12529600 times,and when the deformation rate is 3%,the fatigue life of FRPM pipe culvert was 6937100 times.The prediction model shows that FRPM pipe culvert has good fatigue performance,and the fatigue life can meet the service requirements.
作者
孙超
王清洲
魏连雨
孟会林
王笑森
SUN Chao;WANG Qingzhou;WEI Lianyu;MENG Huilin;WANG Xiaosen(Road R&D Center,Hebei Transportation Planning and Design Institute Co.,Ltd.,Shijiazhuang 050000,China;School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300000,China)
出处
《复合材料科学与工程》
CAS
北大核心
2023年第4期113-120,共8页
Composites Science and Engineering
基金
半刚性基层沥青路面精益建造技术研究(JD-202001)。
关键词
FRPM管涵
变形率
疲劳性能
剩余刚度理论
FRPM pipe culvert
deformation rate
fatigue performance
residual stiffness theory
