板式橡胶支座梁式桥准隔震体系参数组合研究  

Study on Parameter Combination of Quasi-Isolation System of Beam Bridge with Laminated Rubber Bearing

作　　者：田石柱[1] 韩铴 刘晨光 TIAN Shizhu;HAN Tang;LIU Chenguang(College of Civil Engineering,Suzhou University of Science and Technology,Suzhou,China,215009)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215009

出　　处：《沈阳建筑大学学报（自然科学版）》2024年第6期1001-1011,共11页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(52208189);江苏省高等学校基础科学(自然科学)面上项目(21KJB580006)。

摘　　要：目的提出纵横桥向分别设置X型弹塑性钢挡块、黏滞阻尼器与板式橡胶支座进行组合的方法,形成板式橡胶支座梁式桥准隔震体系来提高桥梁的抗震性能,克服采用板式橡胶支座的梁式桥限位能力、自复位能力不足等缺陷。方法应用OpenSees有限元软件建立一座四跨连续梁桥全桥精细化模型,通过主梁位移、桥墩内力、支座剪力与位移等地震响应对X型弹塑性钢挡块和黏滞阻尼器进行了力学性能参数分析。结果横桥向X型弹塑性钢挡块与板式橡胶支座的组合可以有效控制梁体在地震作用下的位移,基本消除震后残余位移,且在合理选择挡块力学性能参数的情况下,能够有效降低支座承受的剪力与位移,同时减小传递到桥梁下部结构的惯性力以起到保护作用;纵桥向黏滞阻尼器和板式橡胶支座的组合,采用较为合理的参数选择可以一定程度上减小梁端的最大位移和残余位移,且大大降低了墩柱所承受的内力,确保桥梁下部结构免受严重损伤。结论板式橡胶支座与X型弹塑性钢挡块、黏滞阻尼器组合形成的板式橡胶支座梁式桥准隔震体系能够有效提高桥梁的抗震性能,解决强震作用下梁体位移过大的问题。In order to overcome the defects of beam bridge with laminated rubber bearing,such as insufficient limit capacity and self-reset capacity,a method of combining X-shaped elastic-plastic steel retainer,viscous damper and laminated rubber bearing in longitudinal and transverse bridge directions is proposed to form quasi-isolation system of laminated rubber bearing beam bridge to improve the seismic performance of the bridge.A refined finite element model of a four-span continuous beam bridge is established by using OpenSees.The mechanical performance parameters of X-shaped elastic-plastic steel retainer and viscous damper are analyzed by the seismic response of main beam displacement,column internal force,bearing shear force and displacement.The results show that the combination of X-shaped elastic-plastic steel retainer and laminated rubber bearing can effectively control the displacement of the beam under earthquake,and basically eliminate the residual displacement after earthquake.In addition,under the condition of reasonable selection of mechanical properties of retainer,the shear force and displacement of the bearing can be effectively reduced,and the inertia force transmitted to the substructure of the bridge can be reduced to play a protective role.The combination of longitudinal bridge viscous damper and laminated rubber bearing can reduce the maximum displacement and residual displacement of beam end to a certain extent by adopting reasonable parameter selection,and greatly reduce the internal force of column,so as to ensure that the substructure of bridge is protected from serious damage.The conclusion is that the quasi-isolation system of laminated rubber bearing beam bridge can effectively improve the seismic performance of the bridge and solve the problem of excessive displacement of beam under strong earthquake.

关 键 词：板式橡胶支座 准隔震体系 X型弹塑性钢挡块 黏滞阻尼器 

分 类 号：TU997[建筑科学—市政工程] U442.55[建筑科学—桥梁与隧道工程]