九度强震区高铁简支箱梁减隔震体系研究  

Study on the Seismic Isolation System of High-speed Railway Simple Supported Beam Bridge in Nine-degree Seismic Regions

作　　者：董俊 DONG Jun(Sichuan College of Architectural Technology,Chengdu 610399,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,成都610399 [2]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道标准设计》2024年第4期131-137,共7页Railway Standard Design

基　　金：国家自然科学基金高速铁路基础研究联合基金项目(U1934207);国家重点研发计划青年科学家项目(2022YFB2602500);德阳市科技计划重点研发项目(2022GZ007,2022SZ075)。

摘　　要：为提出适用于9度强震区高速铁路简支箱梁的合理减隔震体系,基于核密度估计的地震易损性分析方法,以某高速铁路9度区32 m跨度简支箱梁为工程背景,采用时程分析法建立5种减隔震方案下桥梁结构地震易损性曲线,研究5种减隔震体系对桥梁抗震性能的影响。分析结果表明:球型钢支座与减隔震支座限位能力不足,不能满足9度地震区铁路简支梁桥抗震需求;采用减隔震支座、弹塑性限位耗能装置与钢防落梁组合减隔震体系后,9度区铁路简支梁地震损伤破坏发生概率最低,罕遇地震下桥墩完全破坏发生概率可控制在8%,金属弹塑性限位耗能装置具有耗能减震效果,可降低墩底内力,保护桩基础,同时钢防落梁发挥限位作用,罕遇地震下支座发生完全破坏的损伤概率小于10%,有效防止了落梁震害;推荐双曲面减隔震支座+弹塑性限位耗能装置+钢防落梁方案作为9度区铁路简支梁的组合减隔震体系。In order to propose the reasonable seismic isolation system for high-speed railway simple supported box girder bridge in nine-degree seismic regions,the seismic vulnerability curves of a 32 m high-speed railway simple supported beam bridge under five seismic isolation systems are established by using the analysis method on the basis of kernel density estimation,and the effects of the five seismic isolation systems on the seismic performance of bridge are studied.The results show that the limitation capacity of spherical steel bearing and seismic isolation bearing cannot meet the seismic requirements of the railway simple supported beam bridge in nine-degree seismic regions.The combined seismic isolation system composed of seismic isolation bearing,elastic-plastic displacement restricting and energy dissipation devices and steel anti-drop-beam can effectively reduce the probability of seismic damage of bridge structure.The probability of seismic damage of bridge structure is the lowest under the combined seismic isolation system,and the probability of complete failure of bridge pier under rare earthquake is controlled at 8%.The metal elastic-plastic displacement restricting and energy dissipation device can reduce the internal force at the bottom of pier and protect the pile foundation;the damage probability of complete bearing failure under rare earthquakes is less than 10%and the steel anti-drop-beam can prevent falling beam.Therefore,the combined seismic isolation system in hyperbolic seismic isolation bearing+elastic-plastic limiting energy dissipation device+steel anti drop beam is recommended as the seismic isolation system of railway simple supported beam in nine-degree seismic regions.

关 键 词：高速铁路 简支梁 9度强震区 减隔震体系 损伤概率 

分 类 号：U238[交通运输工程—道路与铁道工程] U442.5[建筑科学—桥梁与隧道工程] TU311.3