中文摘要：

桥梁活载设计标准是桥梁设计的主要依据和控制因素。基于对目前世界各国高速铁路上运行的典型车辆和采用的活载标准的深入研究,针对我国高速铁路桥梁常见的结构形式,对常用中小跨度简支梁、连续梁在现行运营车辆荷载和多种标准设计活载下的结构响应进行了比较分析。分析结果表明,采用我国现有的活载设计标准指导设计,中小跨度桥梁结构偏于安全,但安全储备量过大,有必要进行适当优化。综合考虑安全性及经济性,建议采用0.6UIC活载作为高速铁路客运专线中小跨度桥梁设计活载,采用UIC活载作为高速铁路客货共线中小跨度桥梁的设计活载。

英文摘要：

Live load standard is one of the dominant factors for the design of railway bridges.Based on a thorough investigation of the current representative running vehicles and standard live loads on high-speed railways around the world,the structural responses of small-and medium-span simply-supported beams and continuous beams of China＇s high-speed railways were calculated and analyzed.The results indicate that the safety factor of these bridges is enough but the development reserve is too high under the current live load standard,so it is necessary to optimize the live load pattern for small-and medium-span high-speed railway bridges.Through a comprehensive comparison,0.6UIC and UIC live loads are recommended as the design live load of railway bridges in passenger-specific lines as well as passenger and freight mixed lines,respectively.