基于三维光学摄影测量系统的U肋加劲板初始几何缺陷分布规律  

3D optical photogrammetry system based initial geometric imperfection distribution rule for U-rib stiffened plates

作　　者：李刚[1] 韩冰 濮留纯 黄琪盛 卫星[1] LI Gang;HAN Bing;PU Liuchun;HUANG Qisheng;WEI Xing(School of Civil Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;Southern Sichuan Inter-city Railway Co.,Ltd.,Zigong,Sichuan 643002,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]川南城际铁路有限责任公司,四川自贡643002

出　　处：《公路交通科技》2025年第3期147-154,共8页Journal of Highway and Transportation Research and Development

基　　金：国家重点研发计划项目(2022YFB3706703);四川省铁路产业投资集团科技项目(SRIG2019FW0001);中铁第五勘察设计院集团有限公司科技研究计划课题(T5Y2020-B03);陕西省高性能混凝土工程实验室项目(Ky2017-062)。

摘　　要：【目标】考虑U肋加劲板真实初始几何缺陷分布,研究不同初始几何缺陷状态对加劲构件受压稳定承载力及破坏模态影响规律。【方法】采用三维光学摄影测量系统(TDOPS)的新型测试方法,对12个加劲板试件的初始几何缺陷形态和缺陷幅值进行试验测试,并借助ABAQUS有限元软件对不同初始几何缺陷形态加劲板进行了受压承载力和破坏模态数值模拟计算分析。【结果】U肋加劲板试件纵向几何缺陷呈现正弦半波变形、对角对称扭转变形、L型翘曲变形、正弦半波与扭转耦合变形等4种变形形态,缺陷幅值约为规范推荐值的1.0~2.3倍;试件横向初始几何缺陷分布规律与规范推荐值一致,均呈现正弦半波变形规律,缺陷幅值约为1.0~4.8倍。对于母板宽度较大的试件,初始几何缺陷形态不同对其受压承载力和破坏模态均有影响,承载力有1%~5%的下降,较规范计算值偏大,破坏模态各不相同,而对于母板宽度较小的试件,初始几何缺陷形态不同仅会影响其承载力,而破坏模态基本一致,均表现为U肋端部屈曲破坏,与规范值计算结果相同。【结论】在对U肋加劲板进行受压稳定研究时,需要考虑初始几何缺陷形态不同和缺陷幅值大小带来的影响,进而准确分析加劲板极限承载能力和破坏形态。[Objective]Considering the true initial geometric distribution imperfection of U-rib stiffened plate,the influencing rule of different initial geometric imperfections on compressive stability bearing capacity and failure mode of stiffened plate was studied.[Method]A new test method using three-dimensional optical photogrammetry system(TDOPS)was first adopted to determine the longitudinal and transverse initial geometric imperfection shapes and imperfection of 12 stiffener specimens,and with the aid of the ABAQUS finite element software,the compressive bearing capacity and failure modes of the stiffened plate with different initial geometrical defects were calculated and analysed.The longitudinal distribution of U-rib stiffener specimens is different from the recommended value in the specification,and there are four types of deformations:sine half-wave deformation,diagonally symmetric torsional deformation,L-shaped warping deformation,sine half-wave and torsional coupling deformation.The defect amplitude is about 1.0~2.3 times the recommended value of the specification;the transverse initial geometric defect distribution law of the specimen is consistent with the recommended value of the specification,and all show the law of sine half-wave deformation,and the defect amplitude is about 1.0~4.8 times.[Result]For the W-T and W-D-T specimens with larger width,the different initial geometric defect shapes have both the compressive bearing capacity and the failure mode.As a result,the bearing capacity will drop by 1%to 5%,which is larger than the value calculated in the specification,and the failure modes are also different.For N-T and N-D-T specimens with smaller width,the different initial geometric imperfection shapes will only affect their bearing capacity,and the failure modes are basically the same,showing buckling failure at the end of the U rib,which is the same as the calculation result of the standard value.[Conclusion]When studying the bearing capacity of U-rib stiffened plate,it is necessary to consider the

关 键 词：桥梁工程:初始几何缺陷 有限元 U肋加劲板 受压稳定性 

分 类 号：U446.1[建筑科学—桥梁与隧道工程]