考虑拉力场的钢板梁抗剪承载力计算  

Calculation of shear capacity of steel plate girder considering tension field

作　　者：李立峰[1,2] 郭艳艳 程子涵 孙敬凯 LI Lifeng;GUO Yanyan;CHENG Zihan;SUN Jingkai(College of Civil Engineering,Hunan University,Changsha 410082,China;Key Laboratory for Wind and Bridge Engineering of Hunan Province,Changsha 410082,China;Yunnan Wuruoxun Expressway Co.,Ltd.,Kunming 650000,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]风工程与桥梁工程湖南省重点实验室,湖南长沙410082 [3]云南武倘寻高速公路有限责任公司,云南昆明650000

出　　处：《铁道科学与工程学报》2020年第11期2873-2881,共9页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51978257);陕西省交通厅科研课题(17-19K);云南省交通厅科研课题资助项目(2017-17)。

摘　　要：针对采用拉力场计算的腹板发生弹性剪切屈曲的钢板梁抗剪承载力的可靠性进行分析,并针对不产生腹板弹性剪切屈曲的钢板梁提出抗剪承载力计算方法,设计完成4个钢板梁抗剪模型试验,掌握其破坏模式和特征,获得顶底板弯曲应变及面内变形、腹板主拉应变及面外变形;根据试验现象,提出适用于不产生腹板弹性剪切屈曲的钢板梁抗剪的扩展拉力场理论,提出相应的计算公式;并采用ABAQUS软件建立试验梁空间有限元模型,理论仿真与试验结果吻合良好。研究结果表明:对于腹板产生弹性剪切屈曲的钢板梁,采用Rockey理论计算的抗剪承载力精度较高,对于腹板不产生弹性剪切屈曲的钢板梁,抗剪破坏时也发展了拉力场机制,采用本文提出的扩展拉力场理论计算公式具有较高精度,可为实际工程与规范提供参考价值。In order to analyze the reliability of calculating the shear capacity of plate girders with elastic shear buckling of web by tensile field,and to propose the calculation method of the shear capacity of plate girders without elastic shear buckling of web,four shear model tests of steel plate beam were designed and completed in this paper,and the shear failure mode and failure characteristics were grasped.At the same time,test results such as the bending strain and the in-plane deformation of compression flange and tension flange,the main tensile strain and the out of plane deformation of the web were obtained.Based on the experimental phenomena,this paper proposed an extended theory based on Rockey’s theory,which was suitable for calculating the shear capacity of plate girders with elastic shear buckling of web,and the corresponding calculation formula was put forward.At the same time,ABAQUS was used to establish the spatial finite element model of the test girder,and the theoretical and simulation results were in good agreement with the test results.The results are as follows.For plate girders with elastics hear buckling of web,the accuracy of shear capacity calculated by Rockey’s theory is high.And for plate girders without elastic shear buckling of web,the tensile field is also developed in shear failure.In this case,the results of the extended tensile field theory proposed in this paper have high accuracy,which provide some reference value for engineering and specifications.

关 键 词：钢板梁 拉力场理论 旋转应力场理论 屈曲后强度 抗剪承载力 

分 类 号：U448.212[建筑科学—桥梁与隧道工程]