钢板梁桥腹板间隙变形及力学特征  

Deformation and Stress Characteristics of Web Gap in Steel Plate Girder Bridge

作　　者：姚悦[1] 吉伯海[1] 高玉强 傅中秋[1] Yao Yue;Ji Bohai;Gao Yuqiang;Fu Zhongqiu(College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学土木与交通学院,江苏南京210098

出　　处：《华东交通大学学报》2022年第2期35-44,共10页Journal of East China Jiaotong University

基　　金：国家重点研发计划项目(2017YFE0128700);中央高校基本科研业务费专项资金项目(B200203097,B210203064);江苏省研究生科研与实践创新计划项目(KYCX20_0452)。

摘　　要：为更准确的模拟钢板梁桥腹板间隙的变形与力学特征,建立四跨连续钢板组合梁桥全局模型,考虑了多种主梁结构形式,分析腹板间隙局部的变形特征。基于该变形特征,建立了相应的梁段计算模型,并通过实桥应力测试数据与有限元计算结果验证了该模型的正确性。考虑腹板间隙长度小、厚度大的构造特征,采用模型进一步明确腹板间隙的剪应力与正应力特征。结果表明:腹板间隙受到“转角”与“位移”的共同作用,将腹板间隙简化为两端固结且受到转角与位移共同作用的梁体,更符合该构造实际受力特征。腹板间隙端部的剪应力与正应力作用比例与荷载无关,仅与腹板间隙的长度与厚度有关,可为该细节的多轴评估提供依据。To simulate the stress characteristics of web gap more accurately in steel plate girder bridge,a global model of a four-span continuous steel plate composite girder bridge was established.Considering various structure of main girder,the local deformations of web gap were analyzed.Based on the deformation characteristics,the simplified structural mechanics model was established,and the correctness of the model was verified by the stress test data in real bridge and finite element calculation results.Considering the small length and large thickness of web gap,the shear stress and normal stress of web gap of web gap were further determined by using this model.The results show that the web gap is affected by the coaction of"rotation"and"displacement".It would be more consistent with the actual stress characteristics when the web gap was simplified as the beam consolidated at both ends,and subjected to the coaction of rotation"and displacement.The ratio of shear stress and normal stress at the end of web gap is independent of the load,related to the length and thickness of the structure.The conclusions could provide a basis for multi-axis evaluation of web gap.

关 键 词：钢板梁桥 腹板间隙 梁段计算模型 变形 应力 

分 类 号：U443.32[建筑科学—桥梁与隧道工程]