全寿命(耐久型)盆式球钢支座抗震性能有限元分析  

Finite Element Analysis on Seismic Performance of Full Life(Durable)Basin Type Spherical Steel Bearing

作　　者：江志刚 赵莺菲 赵全胜[3] 李旭东 JIANG Zhi-gang;ZHAO Ying-fei;ZHAO Quan-sheng;LI Xu-dong(Hebei Expressway Yanchong Management Center,Zhangjiakou Hebei 075400,China;Research Institute of Highway,Ministry of Transport,Beijing 100088,China;School of Civil Engineering,Hebei University of Science and Technology,Shijiazhuang Hebei 050018,China;Hebei Xiong'an Jingyi Quality Inspection Service Co.,Ltd.,Xiong'an New Area Hebei 071799,China)

机构地区：[1]河北省高速公路延崇管理中心,河北张家口075400 [2]交通运输部公路科学研究院,北京100088 [3]河北科技大学建筑工程学院,河北石家庄050018 [4]河北雄安京翼质量检测服务有限公司,河北雄安新区071799

出　　处：《公路交通科技》2022年第10期75-83,共9页Journal of Highway and Transportation Research and Development

基　　金：2021年度河北省引智项目(YZ202106);河北省交通运输厅计划项目(YC-201918)。

摘　　要：以桥梁全寿命盆式球钢支座为研究对象,研究其在受水平荷载影响时,结构的受力机理和抗震性能,旨在解决桥梁服役期支座的更换问题。以控制变量分析法为基本逻辑,运用有限元分析法进行了分层次、分阶段的模拟探究。在模型搭建上采用ANSYS和ABAQUS分析软件,并渐进性地研究了模型在水平荷载下的受力情况。使用ANSYS建立了桥梁全寿命盆式球钢支座模型,分析了结构在单调载荷和循环载荷下的受力情况,得到了结构变形和应力发展情况,确定了结构在水平荷载下受力的薄弱部位。基于ABAQUS建立了支座局部细化模型,从载荷方式和锚固保护层厚度入手,研究了支座在水平荷载下的破坏模式、承载力、抗震耗能性。对不同锚固保护层厚度的有限元模型进行了模拟分析。结果表明:整个模型受力性能良好,荷载-变形曲线呈线性发展,下座板四角支撑螺栓位置出现了明显的应力集中现象,明确了支座抗震性能的弱节点位置,验证了支座弱节点位置的最终破坏模式均表现为螺栓破坏;随着保护层厚度的增加,支座的水平承载能力明显提高,但增速略有放缓,结构抗震耗能性以保护层厚度50 mm为界呈现先减小后增大的趋势,至80 mm后趋于稳定,建议全寿命盆式球钢支座锚固保护层厚度设置在50~80 mm范围内,循环加载后支座水平承载力比单调加载后低,抗震设计中同样应予以考虑。Taking the full life basin type spherical steel bearing of bridge as the research object to study the stress mechanism and seismic performance of the structure under the influence of horizontal load,the purpose is to solve the problem of bearing replacement during the service period of bridge.Taking the control variable analysis method as the basic logic,the layered and phased simulation study is conducted by using the finite element analysis method.The model is built by using analysis softwares ANSYS and ABAQUS,and the stress condition of the model under horizontal load is studied gradually.The full life basin type spherical steel bearing model of the bridge is established by using ANSYS,the stresses of the structure under monotonic load and cyclic load are analyzed,the structural deformation and stress development are obtained,and the weak parts of the structure under horizontal load are determined.Based on ABAQUS,the local refinement model of the bearing is established,and the failure mode,bearing capacity and seismic energy dissipation of the bearing under horizontal load are studied from the load mode and the thickness of anchor protection layer.The simulation analysis of the finite element models with different anchor protection layer thicknesses is conducted.The result shows that(1)The whole model has good mechanical performance,the load-deformation curve develops linearly,and there is an obvious stress concentration phenomenon at the bolt positions of the 4 corners of the lower base plate,which clarified the weak node position of the seismic performance of the support,and verified that the ultimate failure mode of the weak node position of the support is bolt failure.(2)The horizontal bearing capacity of the bearing increases obviously with the increase of the protection layer thickness,but the growth rate slows down slightly.The seismic energy consumption of the structure decreases first and then increases with the protection layer thickness of 50 mm as the boundary,and then stabilizes after reaching 80

关 键 词：桥梁工程 抗震性能 有限元分析 全寿命盆式球钢支座 支座螺栓 锚固保护层厚度 

分 类 号：U443.362[建筑科学—桥梁与隧道工程]