某跨海连续梁桥隔震研究  

Study on Isolated Sea-crossing Continuous Girder Bridge

作　　者：黄佳栋 谭平[1] 郑建勋[1] 吴国斌[1] 

机构地区：[1]广州大学工程抗震研究中心,广东广州510405

出　　处：《石家庄铁道大学学报（自然科学版）》2015年第3期18-24,共7页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：973计划(2011CB13606);国家自然科学基金(1334209)

摘　　要：以某跨海连续桥梁为工程背景,研究了不同隔震措施下该桥梁结构的地震响应。采用有限元软件Midas Civil对该工程中六跨连续梁桥建立三维有限元精细化分析模型,考虑将该桥梁支座分别设置为铅芯橡胶隔震支座、摩擦摆式支座,并与普通盆式橡胶支座时该梁桥的动力特性与地震响应进行系统的对比研究,以评价跨海连续梁桥的隔震性能。研究结果表明,与普通连续桥梁相比,隔震后桥梁结构自振周期延长,桥梁墩顶最大位移、桥墩墩底弯矩、剪力均显著减小。采用摩擦摆式隔震支座时该跨海连续梁桥可取得更好的减震效果,但其位移较铅芯橡胶隔震支座时大。In order to investigate the dynamic response and isolation effectiveness of base-isolated continuous bridge,a sea-crossing continuous girder bridge is studied and different types of isolators are considered,including lead rubber bearing and friction pendulum bearings. The refined finite element model of a continuous girder bridge with six spans is established within the environment of Midas Civil. Dynamic characteristics and responses of sea-crossing isolated continuous girder bridge to a set of earthquake records are compared with the corresponding bridge with ordinary pot rubber bearings. Research results show that the isolated sea-crossing bridge possesses longer natural vibration period,whose maximum displacement of the pier—top,maximum shear,bending moment of the bottom of the bridge and piers of the base-isolated continuous bridge are much smaller than the bridge with ordinary pot rubber bearings. In contrast,friction pendulum bearings can achieve better performance than lead rubber bearings at the cost of larger isolation displacement.

关 键 词：连续梁桥 铅芯支座 摩擦摆支座 隔震 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]