摘要
基于近年来在我国开展的多条高速铁路桥梁动力性能试验研究,对设计速度200～250km/h的常用跨度简支梁桥以及连续梁桥的自振特性、刚度参数、梁体动力响应以及动车组通过桥梁时的安全性和平稳性试验结果进行系统总结和规律分析,研究结果表明:①高速铁路桥梁具有足够的竖、横向刚度,能够满足动车组200～250km/h高速运行要求;②现有高速铁路设计规范通过控制简支梁的竖向自振频率,避开了由移动荷载列对桥梁产生的竖向加载频率,有效控制了梁体竖向共振发生,但在特定车速下会产生超谐共振;③常用跨度混凝土简支梁横向自振频率与列车横向强振频率相差较远,不会产生横向共振现象;④在现有桥梁刚度条件下,连续等跨布置简支梁对高速动车组的运行安全性和平稳性没有影响。
Abstract： Based on the recent experimental research results on dynamic behavior of many high-speed railway bridges in China, the results of common-span simply-supported beams and continuous beams are summarized and analyzed. The research indexes include natural characteristics, stiffness parameters, dynamic responses of beam, security and statiouarity of multiple unit when passing the bridge. Following results can be shown ： （ 1 ） the vertical and lateral rigidity of high-speed railway bridges is sufficient to meet the requirements of running speeds between 200km/h and 250km/h. （2） in the code for design of high speed railway bridges, vertical natural frequency is defined strictly to keep away from forced frequency of moving load, therefore beam resonance is restricted effectively. However, the superharmonic resonance will appear at particular velocity. （3） for concrete simply-supported beams with common spans, the lateral natural frequency is far from the forced frequency and the lateral resonance cannot appear. （4） the continuous equal span arrangement of simple supported beams under the present bridge rigidity has have no effect on safety and stationarity of nmhiple unit.
出处
《土木工程学报》
EI
CSCD
北大核心
2013年第3期96-102,共7页
China Civil Engineering Journal
基金
铁道部科技开发计划项目(2012G006-C
2011YJ90)
关键词
高速铁路
桥梁
动力性能
超谐共振
high-speed railway
bridge
dynamic behavior
superharmonic resonance
