重载列车作用下曲线地段线桥结构可靠度研究
发布时间：2018-12-28 14:23
【摘要】：我国主要重载铁路干线均位于中西部山区,受地形条件限制设置曲线较多。曲线地段桥梁结构尤其薄弱,且线路-桥梁系统参数的随机性对列车在曲线地段桥梁运行时的动力响应影响很大。在重载运输提速、大轴重、长编组的发展要求下,对曲线地段线桥结构的安全性在线路-桥梁系统参数的随机性前提下进行概率意义上的可靠度评估可以为既有重载铁路实际运营和未来的长足发展提供理论依据。将SIMPACK软件和ABAQUS软件结合,建立了重载列车作用下曲线地段线桥结构动力分析模型,模型的计算结果经与实测数据对比,显示能够较好地模拟实际情况。以桥面板的加速度响应值作为桥梁及上部结构安全运营的控制指标,对于影响该控制指标的多个线路-桥梁结构的随机参数应用2k析因实验设计法进行了参数敏感性分析,并在敏感参数的随机性前提下应用响应面法的中心复合设计法和改进一次二阶矩法估计了不同曲线半径、不同车辆轴重下的曲线桥梁的横向、垂向可靠度。通过研究得到以下主要结论:1)相比一次一因子法,2k析因设计法可以关注参数间的交互作用对目标响应的影响,结果显示某些参数的交互作用比单参数的影响要大,桥面板加速度动响应的敏感参数以梁体参数为主。2)车辆轴重为30t时,在两种轨道不平顺条件下不同曲线半径的线桥系统的失效概率在横向、垂向上均满足安全性要求;曲线半径越小,对应的线桥系统横向、垂向的失效概率越大;3)在两种轨道不平顺条件下,当曲线半径小于800m时,线桥系统的失效概率相比R800m曲线时都急剧提高(如R600m在实测谱条件下横、垂向失效概率与R800m时的比值分别达到∞及2.70×1042);考虑重载列车作用下的线桥系统的服役性能,在新建重载铁路的设计中推荐采用R800m及以上的曲线半径;4)轨道不平顺对曲线地段线桥系统的失效概率存在很大影响,六级谱条件下的失效概率均远大于实测谱条件下的失效概率(如R800m时六级谱条件下的横、垂向失效概率与实测谱条件下的比值分别达到∞及1.07×1031);可见在推荐采用R800m及以上曲线半径的同时,对轨道不平顺进行控制也能大幅提升重载列车作用下的线桥系统的可靠度;5)在六级谱条件下车辆轴重为35t时,线桥系统横向接近失效,车辆轴重为40t时,线桥系统横向的失效概率已超过限值;因此在既有的按照轴重30t标准建设的重载标准梁上运行列车的轴重应控制在35t以下。
[Abstract]:The main heavy-haul railway trunk lines in China are located in the mountainous areas of the central and western regions, and many curves are set due to the constraints of terrain conditions. The bridge structure in curved section is especially weak, and the randomness of the parameters of the line-bridge system has a great influence on the dynamic response of the train when the bridge is running in the curved section. Under the requirements of the development of heavy haul transportation, high speed, large axle load and long marshalling, On the premise of randomness of the parameters of the line-bridge system, the reliability evaluation of the bridge structure in curve section can provide a theoretical basis for the actual operation of the existing heavy-haul railway and the development of the railway in the future. The dynamic analysis model of curve section bridge structure under the action of heavy haul train is established by combining SIMPACK software with ABAQUS software. The calculation results of the model are compared with the measured data and show that the model can simulate the actual situation well. The acceleration response of bridge deck is taken as the control index of bridge and superstructure safe operation. The parameter sensitivity analysis of random parameters of many line-bridge structures which affect the control index is carried out by using 2k factorial experimental design method. Based on the randomness of sensitive parameters, the central composite design method of response surface method and the improved first-order second-order moment method are used to estimate the transverse and vertical reliability of curved bridges with different radius curves and different vehicle axle loads. The main conclusions are as follows: 1) compared with one-factor method, 2k factorial design method can focus on the effect of interaction between parameters on target response. The results show that the interaction of some parameters is more important than that of single parameter. The main sensitive parameters of the acceleration response of bridge deck are beam body parameters. 2) when the axle weight of vehicle is 30 t, the failure probability of the line bridge system with different curve radius under two different track irregularity conditions meets the safety requirements in the transverse and vertical directions. The smaller the curve radius, the greater the vertical failure probability of the corresponding line bridge system. 3) under two kinds of track irregularity, when the curve radius is less than 800m, the failure probability of the bridge system is increased sharply compared with the R800m curve (for example, R600m is transverse under the measured spectrum condition). The ratio of vertical failure probability to R800m is up to 鈭，
本文编号：2394062
[Abstract]:The main heavy-haul railway trunk lines in China are located in the mountainous areas of the central and western regions, and many curves are set due to the constraints of terrain conditions. The bridge structure in curved section is especially weak, and the randomness of the parameters of the line-bridge system has a great influence on the dynamic response of the train when the bridge is running in the curved section. Under the requirements of the development of heavy haul transportation, high speed, large axle load and long marshalling, On the premise of randomness of the parameters of the line-bridge system, the reliability evaluation of the bridge structure in curve section can provide a theoretical basis for the actual operation of the existing heavy-haul railway and the development of the railway in the future. The dynamic analysis model of curve section bridge structure under the action of heavy haul train is established by combining SIMPACK software with ABAQUS software. The calculation results of the model are compared with the measured data and show that the model can simulate the actual situation well. The acceleration response of bridge deck is taken as the control index of bridge and superstructure safe operation. The parameter sensitivity analysis of random parameters of many line-bridge structures which affect the control index is carried out by using 2k factorial experimental design method. Based on the randomness of sensitive parameters, the central composite design method of response surface method and the improved first-order second-order moment method are used to estimate the transverse and vertical reliability of curved bridges with different radius curves and different vehicle axle loads. The main conclusions are as follows: 1) compared with one-factor method, 2k factorial design method can focus on the effect of interaction between parameters on target response. The results show that the interaction of some parameters is more important than that of single parameter. The main sensitive parameters of the acceleration response of bridge deck are beam body parameters. 2) when the axle weight of vehicle is 30 t, the failure probability of the line bridge system with different curve radius under two different track irregularity conditions meets the safety requirements in the transverse and vertical directions. The smaller the curve radius, the greater the vertical failure probability of the corresponding line bridge system. 3) under two kinds of track irregularity, when the curve radius is less than 800m, the failure probability of the bridge system is increased sharply compared with the R800m curve (for example, R600m is transverse under the measured spectrum condition). The ratio of vertical failure probability to R800m is up to 鈭，
本文编号：2394062
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