摘要
研究目的:为提高高墩桥梁的抗震性能,利用梁体具有大质量的属性,提出一种动力吸振型高墩桥梁结构,基于扩展定点理论、有限单元法和列车-轨道-桥梁动力相互作用理论,对3种墩高的高墩桥梁在4条实测汶川地震波作用下的抗震特性及列车过桥安全性进行分析。研究结论:(1)相对于常规型桥梁,动力吸振型桥梁不仅可以有效抑制地震作用下不同高度桥梁在设计固有频率处的墩顶横向位移和加速度,对梁体的横向振动也有一定程度的抑制作用;(2)动力吸振型桥梁墩体应力最大值较常规型桥梁有很大幅度的降低,即便是计算工况中最小的减震率,也达到了43.57%;(3)由于抑制了作为列车运行基础的梁体横向振动,列车通过动力吸振型桥梁时的脱轨系数和轮重减载率均低于通过常规型桥梁时的指标,过桥安全性也得到提高;(4)本研究成果可为高墩简支梁桥抗震设计提供理论支撑。
Research purposes:In order to improve the seismic performance of high pier bridges,a new dynamic vibration absorption bridge structure is presented,in which the beam with large quality is designed as a DVA attached on the pier.Based on the extended fixed-point theory,the finite element method and the train-track-bridge dynamic interaction theory,seismic behavior of three railway bridges with different pier height and the train running safety subjected to 4 measured seismic waves are analyzed.Research conclusions:(1)Compared with the bridges with conventional bearing,not only the lateral displacement and acceleration of the pier top in the dynamic vibration absorbing bridges could be effectively suppressed,but also the lateral vibration of the beam is suppressed.(2)The maximum pier stress has been greatly reduced with a minimum damping rate up to 43.57%.(3)As a result of vibration damping of the beam,the derailment coefficient and the wheel-load reduction ratio of the train passing through the dynamic vibration absorbing bridges are lower than those through the bridges with conventional bearing,and the running safety of the train is also improved.(4)The research results could provide some guides for the seismic design of high pier simply supported beam bridge.
作者
杨吉忠
翟婉明
YANG Jizhong;ZHAI Wanming(China Railway Eryuan Engineering Group Co.Ltd,Chengdu,Sichuan 610031,China;Southwest Jiaotong University,Chengdu,Sichuan 610031,China)
出处
《铁道工程学报》
EI
北大核心
2019年第10期59-65,共7页
Journal of Railway Engineering Society
基金
四川省科技计划项目(2017GZ0088,2019YFH0131)
关键词
高墩
桥梁
抗震
动力吸振原理
共振
质量比
high pier
bridge
anti-seismic
dynamic vibration absorption principle
resonance
mass ratio
