山区高速铁路简支梁与长联连续梁适宜性研究

Study on Suitability of Simple-supported Beam and Long-span Continuous Girder for High-speed Railway in Mountainous Area

摘要:

经过多年的发展,通过自主研究、引进消化吸收再创新,我国高速铁路技术得到了快速的发展。根据2016年国务院审议通过的《中长期铁路网规划》,在我国中西部广大地区,将新建多条山区高速铁路。对于山区客运专线铁路,当线路跨越长段沟谷地段时,需采用多个高墩跨越沟谷,多跨简支桥或长联连续梁桥是可供选择的桥梁结构型式之一,需对这种地形条件下的桥梁结构适宜性进行研究。为确定经济合理的桥梁结构型式,通过对比分析长联连续梁与简支结构的受力特点,并结合贵广、成贵等高铁桥梁设计经验,提出了不同联长条件下的桥梁设计原则及解决措施,可为山区高速铁路桥梁设计建造提供参考。

Abstract:

After years of development, through the independent research, the introduction, digestion, absorption and re-innovation, the high-speed railway technology has been developed rapidly in China. According to the Medium and Long-term Railway Network Planning reviewed by the State Council in 2016, many mountainous high-speed railways will be built in the vast areas of central and western China. For the passenger dedicated railways in mountainous area, when the line crosses the long valley sections, it is necessary to use many high piers to cross the valley. The multi-span simple-supported beam bridge or long-span continuous girder bridge is one of the bridge structure types able for selection. It is necessary to study the suitability of bridge structure under this terrain condition. In order to determine the economic and reasonable structure of the bridge, through the comparative analysis of the mechanical characteristics of the long-span continuous beam and the simple-supported structure, and combined with the design experience of the bridges for Guiyang-Guangzhou High-speed Railway and Chengdu-Guiyang High-speed Railway, the design principles and solutions of bridges under the different long-span conditions are put forward, which can provide reference for the design and construction of high-speed railway bridges in mountainous areas.