中兰客运专线桥梁总体设计

中兰客运专线是我国“八纵八横”高速铁路主通道之一“京兰通道”的重要组成部分。为解决中兰客运专线复杂建设环境条件导致的桥梁设计困难，并最大化实现“安全、实用、经济、美观”的设计宗旨，中兰客运专线桥梁设计以标准化简支梁为主，采用大跨桥梁为辅助的解决方案。本文介绍了湿陷性黄土地区桥梁、高烈度地震区桥梁、山地高墩区节段预制胶拼梁、大跨度简支系杆拱等重点桥梁设计特点，采用钢阻尼减隔震支座可有效延长结构的自振周期，满足地震力下结构大位移要求。

Overall Design of Bridges of Zhongwei-Lanzhou PassengerDedicated Line

Zhongwei-Lanzhou Passenger Dedicated Line is an important part of Beijing-Lanzhou Passage,one of the main passages of China s high-speed railway network of"eight north-south lines and eight east-west lines".In order to solve the difficulties in bridge design caused by the complex construction environment of Zhongwei-Lanzhou Passenger Dedicated Line,and realize the design aim of"safety,practicality,economy and beauty"to the maximum extent,the bridge design of this railway is mainly based on standardized simply supported girders,and long-span bridges are adopted as auxiliary solutions.This paper introduces the design features of key bridges such as those in collapsible loess areas,those in high-intensity earthquake areas,segmental precast bonded girders in mountain high pier areas,long-span simply supported bar arches,etc.,and concludes that steel damping isolation bearings can effectively prolong the natural period of the structure,and meet the requirements of large displacement of the structure under earthquake force.