高烈度区典型连续梁桥限位挡块设计参数研究  

Research on design parameters of shear keys of typical continuous beam bridge in high-intensity seismic region

作　　者：董俊 文娟娟[1] 杨转运[1] DONG Jun;WEN Juanjuan;YANG Zhuanyun(Sichuan College of Architectural Technology,Deyang 618000,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]四川建筑职业技术学院,四川德阳618000 [2]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《铁道科学与工程学报》2022年第12期3678-3692,共15页Journal of Railway Science and Engineering

基　　金：国家基础研究重大项目联合基金资助项目(U1934207);国家重点研发计划青年科学家项目(2022YFB2602500);四川省科技计划资助项目(2019YFG0048);四川省博士后科研项目特别资助(KSWQ224001)。

摘　　要：为研究钢筋混凝土挡块对高烈度地震区典型连续梁桥抗震性能的影响,得到合理的钢筋混凝土挡块设计参数,以某8度0.3g地震区典型公路连续T形梁桥为工程背景,采用基于贝叶斯估计的桥梁地震易损性分析方法,开展典型连续梁桥各关键构件地震易损性分析,研究6种挡块名义强度和6种挡块初始间隙对桥梁各关键构件地震易损性的影响规律,讨论了8度、9度地震区钢筋混凝土挡块的合理取值问题。研究结果表明:在地震作用下连续梁桥设置了钢筋混凝土限位挡块后,墩梁相对位移显著降低,限位挡块是防止主梁发生落梁震害的有效措施,但设置限位挡块会增大桥墩的地震易损性,合理设置钢筋混凝土挡块参数十分必要。通过对桥梁各关键构件地震易损性云图优化分析,提出了8度、9度地震区典型公路连续梁桥钢筋混凝土挡块合理设计参数取值范围,可为今后高烈度地震区类似桥梁工程提供设计依据。In order to study the influence of reinforced concrete shear keys on seismic performance of typical continuous beam bridge in high-intensity seismic area, and to put forward reasonable design parameters of reinforced concrete shear keys,taking a typical highway continuous T-beam in an 8-degree 0.3g seismic area as the engineering background, the vulnerability analysis method based on Bayesian estimation was used to analyze the seismic vulnerability of each key component of a typical continuous beam bridge. The influence of six kinds of nominal strength and six kinds of initial clearance on the seismic vulnerability of each key component of the bridge was studied, and the reasonable value of reinforced concrete shear keys in 8-degree and 9-degree seismic areas was analyzed. The results show that the relative displacement between pier and beam decreased significantly after the reinforced concrete shear key is installed in the continuous beam bridge under the earthquake action, and the shear key is an effective measure to prevent the earthquake damage of main beam from falling. But it will increase the vulnerability of bridge pier, so it is necessary to set the parameters of reinforced concrete shear keys reasonably. Based on the parameter optimization analysis of seismic vulnerability cloud map of key components of the bridge, the reasonable design parameters of typical highway continuous T-beam shear key in 8 and 9 degree seismic areas are put forward. The research results can provide design basis for similar bridge engineering in high-intensity seismic regions in the future.

关 键 词：桥梁工程 混凝土挡块 地震易损性 设计参数 连续梁桥 

分 类 号：U44[建筑科学—桥梁与隧道工程]