兰新高铁桥梁防风工程技术应用

Technology Application on Bridge Wind Resistance Engineering in Lanzhou-Xinjiang High-speed Railway

兰新高铁新疆境内途经烟墩、百里、三十里、达坂城四大风区,为我国乃至世界上铁路风灾最严重地区。为确保大风条件下,动车组通过桥梁地段运营安全,通过风洞试验、数值模拟计算、动模型等试验研究,桥梁地段采用了开孔挡风屏,核心风区采用槽形梁的组合结构形式。通过大风专项试验,验证了大风条件下动车组高速运行时安全平稳,为高速铁路桥梁设置防风工程提供重要指导意见。

Lanzhou-Xinjiang High-speed Railway passes through the wind areas named Yandun, Baili, Sanshili and Dabancheng in Xinjiang, which are the most serious wind damage areas in our country and even in the world. To ensure the CRH operation safety in high wind condition when it passed bridge location, this paper used different kinds of experiment, such as wind tunnel test, numerical simulation and dynamic model test research, to study the countermeasures. Finally, the hole air barrier was used in bridge location and the groove shape girder was used in centre wind areas. By high winds special test, it verified the smooth security of CRH under the high wind condition, which could offer important guiding ideas for bridge wind resistance engineering of high-speed railway.