Analysis on running safety of train on bridge with wind barriers subjected to cross wind
Analysis on running safety of train on bridge with wind barriers subjected to cross wind
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DOI：
10.12989/was.2013.17.2.203
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发表时间：
2013-08
影响因子：
1.6
通讯作者：
Tian Zhang;H. Xia;W. Guo
中科院分区：
文献类型：
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作者：
Tian Zhang;H. Xia;W. Guo
基于风工程和动力学的相关理论，提出了湍风作用下车桥动力相互作用系统的分析框架。考虑到风场的脉动特性，根据风场功率谱密度函数，采用自回归方法模拟了随机风速时程。桥梁用三维有限元模型表示，车辆用弹簧和阻尼器连接的多刚体系统表示。推导了桥梁和车辆的非定常气动力的详细计算公式。此外，基于建议的评价指标，对中国西北地区新建铁路防风措施的风障形式选择进行了研究，并对风障高度和孔隙率的适宜值进行了研究。以某多跨简支箱梁桥为例，计算了该桥的动力响应和列车在设置风障和不设置风障时的行车安全指标。根据设计规范中的容许值，提出了不同风速下的列车速度极限值。
An analysis framework for vehicle-bridge dynamic interaction system under turbulent wind is proposed based on the relevant theory of wind engineering and dynamics. Considering the fluctuating properties of wind field, the stochastic wind velocity time history is simulated by the Auto-Regressive method in terms of power spectral density function of wind field. The bridge is represented by three-dimensional finite element model and the vehicle by a multi-rigid-body system connected by springs and dashpots. The detailed calculation formulas of unsteady aerodynamic forces on bridge and vehicle are derived. In addition, the form selection of wind barriers, which are applied as the windbreak measures of newly-built railways in northwest China, is studied based on the suggested evaluation index, and the suitable values about height and porosity rate of wind barriers are studied. By taking a multi-span simply-supported box-girder bridge as a case study, the dynamic response of the bridge and the running safety indices of the train traveling on the bridge with and without wind barriers are calculated. The limit values of train speed with respect to different wind velocities are proposed according to the allowance values in the design code.