钢筋混凝土墩塑性铰区抗剪强度模型  

Shear strength model for plastic hinge region of reinforced concrete column

作　　者：韦旺 邵长江[1] 黄辉[1] 李贞新[2] 韩国庆[3] 庄卫林[1] Wei Wang;Shao Changjiang;Huang Hui;Li Zhenxin;Han Guoqing;Zhuang Weilin(Southwest Jiaotong University,Chengdu 610031,China;CCCC Highway Consultants Co.,Ltd.,Beijing 100088,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]西南交通大学,四川成都610031 [2]中交公路规划设计院有限公司,北京100088 [3]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《土木工程学报》2023年第9期54-64,共11页China Civil Engineering Journal

基　　金：国家自然科学基金(51978581,51178395)。

摘　　要：鉴于现行规范仅有实心墩抗剪模型,尚未给出空心墩的抗剪公式,且既有模型对斜截面钢筋变形协调性及纵筋拉伸漂移关注不够,亟需发展更适用于两类桥墩塑性铰区的抗剪强度模型。为此,在探讨墩柱斜截面传力机制的基础上,基于桁架模型中斜裂缝上钢筋应变满足变形协调条件的假定,提出考虑斜截面箍筋非一致变形及纵筋拉伸漂移效应的塑性铰区抗剪强度模型,并结合PEER及文献中88个弯剪破坏墩柱的试验结果对模型参数进行标定。通过另外57组试验数据的对比分析表明,与既有模型相比,所提抗剪模型计算精度更高、离散性更小,适用于预测桥墩塑性铰区的抗剪能力;对应规范的强度折减系数,所提模型设计结果具有较高的安全储备,可用于空心墩和实心墩的抗剪强度设计。Since the shear formula of reinforced concrete(RC)solid column other than hollow member has been given in the current code,and the coordination relation of reinforcement deformation and tension shift during the development of the oblique crack has not been sufficiently considered,the innovative shear strength model applicable for both solid and hollow columns is urgently needed.Therefore,the force transfer mechanism on the diagonal section in the plastic hinge region of the RC column is discussed with the assumption that the deformation compatibility condition of reinforcement strain is given.And a formula of shear strength is proposed for concrete column with the non-uniform deformation of stirrup and tension shift of longitudinal rebar effect.The related parameters of the proposed formula is calibrated by the test results of 88 flexural-shear columns in the literature and PEER database.The rationality of the suggested formula is verified by the test of the other 57 columns and compared with the existing formulas.The analysis results show that the proposed model can effectively predict the shear strength of column with more accuracy and less discreteness than the existing models.Compared with the strength reduction coefficient in the code,the proposed model can be used as a seismic design formula for solid and hollow columns with higher safety allowance.

关 键 词：桥梁工程 钢筋混凝土空心墩 抗剪强度模型 塑性铰区 拉伸漂移 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]