中等烈度区矮墩小箱梁桥的减震体系研究  

Research on Aseismic System of Small Box Girder Bridge With Short Pier in Moderate Intensity Area

作　　者：李闯 吴学平 沈理斌[3] 余茂峰 LI Chuang;WU Xue-ping;SHEN Li-bin;YU Mao-feng(Zhejiang Institute of Communications CO.,Ltd.,Hangzhou 310006,China;Tongji University,Shanghai 200092,China;Jiaxing Communications Investment Group Co.,Ltd.,Jiaxing 314000,China)

机构地区：[1]浙江数智交院科技股份有限公司,浙江杭州310006 [2]同济大学,上海200092 [3]嘉兴市交通投资集团有限责任公司,浙江嘉兴314000

出　　处：《浙江交通职业技术学院学报》2023年第1期1-6,17,共7页Journal of Zhejiang Institute of Communications

摘　　要：中小跨度小箱梁桥普遍采用板式橡胶支座,即使在中等烈度区,当墩高较矮时,地震下主梁与支座间也容易发生滑移,落梁风险较大。以中等烈度区一座4×30m连续小箱梁桥为工程背景,建立常规板式橡胶支座支承体系的桥梁有限元模型,采用非线性动力时程分析方法,进行地震响应分析,提出了板式橡胶支座(允许滑移)+钢阻尼器的组合减震体系,并对其减震效果进行了分析。结果表明:板式橡胶支座+钢阻尼器的组合减震体系可以有效控制主梁纵横向位移,在一定程度上减小下部结构地震内力。In general,the plate rubber bearing is used for the small and medium span girder bridge.Even in the medium seismic zone,the sliding between the main girder and the bearings is easy to occur under the earthquake when the pier height is short,so the risk of falling beams is high.Taking a 4×30 m continuous small box girder bridge in a medium seismic zone as the engineering background,a finite element model of the conventional plate rubber bearing supporting system was established,and a nonlinear dynamic time-history analysis method was used to analyze the seismic response.According to the analysis results,a combination of plate rubber bearing(allowing sliding)+steel damper system was proposed specifically,and the seismic response reduction effect of the proposed aseismic system is analyzed.The results indicate that:the plate rubber bearing+steel damper composite aseismic system can effectively control the vertical and horizontal displacement of the main beam,and effectively reduce the seismic internal force of the system.

关 键 词：桥梁 板式橡胶支座 小箱梁 矮墩 减震体系 钢阻尼器 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]