铁道标准设计2018，Vol.62Issue(5)：30-36,7.DOI:10.13238/j.issn.1004-2954.201706160001
地震作用对有砟轨道桥上无缝道岔纵向受力与变形影响分析
Seismic Impacts on Longitudinal Stress and Distortion of Welded Turnout on Bridge
摘要
Abstract
Laying welded turnout on bridges of high-speed railway or in dangerous mountain areas is an inevitable technical challenge. According to beam-turnout interaction principle, a dynamic nonlinear finite element model of turnout-bridge-pier in ballasted track is built to analyze the response mechanism of the welded turnout on ballasted bridge subject to the impacts of seismic wave spectrum characteristics, seismic acceleration peak, turnout area resistance and beam temperature differences. The results show that bridge vibration mode is changed after application of welded turnout and the low order mode frequency is considerably increased;both seismic wave spectrum characteristics and seismic acceleration peak impose great influence on the responses of welded turnout constraint; the closer the seismic frequency to structural basic frequency and higher the wave amplitude,the larger the stress and distortion of welded turnout; rail strength and track stability cannot be guaranteed under the synthetic effect of seismic load and severe temperature condition. It is suggested that the design of welded turnout on bridges in earthquake zones should take into consideration of the rail longitudinal strength, turnout connector stress and relative displacement at key positions under the combined action of seismic load and temperature changes of rail and beam.关键词
有砟轨道/桥上无缝道岔/地震作用/轨道约束/振动形态Key words
Ballasted track/Welded turnout on bridge/Seismic action/Track constraint/Vibration mode分类
交通工程引用本文复制引用
罗华朋,陈嵘,宋姣姣,王平..地震作用对有砟轨道桥上无缝道岔纵向受力与变形影响分析[J].铁道标准设计,2018,62(5):30-36,7.基金项目
国家杰出青年科学基金项目(51425804) （51425804）
