收缩徐变作用下铁路连续刚构桥-轨道系统受力特性

发布时间：2018-05-13 16:13

  本文选题：铁路桥梁 + 桥梁工程　； 参考：《铁道学报》2017年05期

【摘要】：通过建立(72+128+72)m高速铁路大跨度连续刚构桥-双线无砟轨道系统仿真模型,揭示收缩徐变作用下大跨度连续刚构桥与轨道相互作用规律,分析收缩徐变模式、混凝土养护条件等主要设计参数对系统受力和变形的影响,探讨采用整体升温代替收缩徐变效应计算的可行性。研究表明:随着服役时间的延长,收缩徐变作用下系统的受力与变形逐渐增大;采用梁体降温30℃计算的钢轨应力和竖向位移无法包络收缩徐变效应引起的钢轨应力和位移,《高速铁路设计规范》中建议采用整体降温10℃来模拟收缩徐变的方法并不适用于梁-轨相互作用分析。
[Abstract]:By establishing the simulation model of large-span continuous rigid frame bridge and double-track ballastless track system in the high-speed railway, the interaction law between long-span continuous rigid frame bridge and track under the action of shrinkage and creep is revealed, and the mode of shrinkage and creep is analyzed. The influence of the main design parameters such as the curing conditions of concrete on the stress and deformation of the system is discussed. The feasibility of calculating the effect of shrinkage and creep by using integral heating instead of shrinkage and creep is discussed. The results show that: with the extension of service time, the stress and deformation of the system increase gradually under the action of shrinkage and creep; The rail stress and displacement caused by rail stress and vertical displacement which can not be enveloped by shrinkage and creep caused by beam cooling at 30 鈩，

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