摘要
结合无砟轨道的结构特点,建立了考虑轨道约束的有限元模型,采用反应谱法研究了多遇地震作用下轨道约束对高速铁路简支梁桥固定支座水平地震力响应的影响.结果表明:当墩高相同时,无砟轨道结构的约束作用在一定程度上降低了固定支座水平地震力的响应,对抗震是有利的;当墩高相差较大时,轨道约束对于高墩附近矮墩的固定支座水平地震力影响是不利的,在此类桥梁的抗震设计中应该考虑轨道约束的不利影响.
Based on properties of the ballastless track structure, a finite element model is established. Elastic response spectra are adopted to research the influence of rail restraints on horizontal seismic forces of fixed bearings of simply supported girder bridge on high-speed railway. The results show that the restraints of ballasteless track structure can reduce horizontal seismic force of fixed bearings for piers with same height. Rail restraints are not beneficial to horizontal seismic forces of fixed bearings on short piers near the high piers. Unfavourable factors of rail restraints should be considered in seismic design of this kind of bridges.
出处
《兰州工业学院学报》
2016年第1期16-20,共5页
Journal of Lanzhou Institute of Technology
关键词
轨道约束
简支梁桥
固定支座
水平地震力
rail restraints
simply supported bridge
fixed bearing
horizontal seismic force
