高速铁路连续刚构加拱组合结构设计及创新技术——以西延高铁王家河特大桥主桥为例  

Design and Innovation of High-speed Railway Continuous Rigid Frame Arch Bridge—Taking the Wangjiahe Super Large Bridge on Xi􀆳an-Yan􀆳an High-speed Railway as an Example

作　　者：张蕾[1] ZHANG Lei(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi􀆳an 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《铁道标准设计》2023年第6期86-92,共7页Railway Standard Design

基　　金：陕西省重点研发计划项目(2022GY-339);中国铁建股份有限公司科技研究课题(2020-C45)。

摘　　要：以西延高铁王家河特大桥为工程背景,首先,对3种混凝土连续刚构组合结构(连续刚构加拱、连续刚构加桁、连续刚构部分斜拉桥)从受力性能、无砟轨道适应性、经济性等方面进行比选,确定连续刚构加拱组合结构为最优方案;其次,阐述连续刚构加拱组合结构设计细节,通过有限元软件对结构的静、动力学性能、抗震性能、车-桥耦合计算分析;再次,对墩、梁、拱结合部位受力情况进行模拟检算,对梁、拱合理刚度分配规律进行总结。主要结论及创新点:(1)桥梁的强度、刚度指标满足规范要求,抗震性能良好、乘车舒适性优良;(2)梁拱结合部位混凝土处于均匀受压状态,局部受力安全可靠;(3)混凝土连续刚构加拱组合结构中拱肋承担活载的比例约占45%,活载有效转化为拱肋的压力和弯矩;(4)提出的高位拱肋单侧竖转施工方法可为类似工程提供参考借鉴。Wangjiahe Super Large Bridge on Xi􀆳an to Yan􀆳an High-speed Railway is taken as the project background in this paper.Firstly,three kinds of concrete continuous rigid frame composite structures(continuous rigid frame arch,continuous rigid frame truss,continuous rigid frame partial cable stayed bridge)are compared and analyzed from the aspects of mechanical performance,ballastless track adaptability and economy,and the continuous rigid frame arch is determined as the optimal scheme.Secondly,design parameters of continuous rigid frame arch are elaborated and finite element model is established to calculate and analyze static and dynamic performance,seismic performance and vehicle bridge coupling.Thirdly,the stress of the joint of pier-beam-arch is simulated and checked,the stiffness distribution law of the beam and arch is concluded.The main conclusions and innovation points are as follows:(1)The strength and stiffness index of the bridge meet the specification requirements,the structure earthquake resistance performance is well,and the ride comfort is excellent.(2)The concrete at the joint of beam and arch is under uniform compression,local stress is safe and reliable.(3)The proportion of live load borne by arch rib is about 45%,which is transformed into the pressure and bending moment of arch rib.(4)The suggested one side vertical rotation method of arch rib can provide reference for similar projects.

关 键 词：高速铁路 铁路桥梁 无砟轨道 方案比选 连续刚构加拱组合结构 竖转施工 

分 类 号：U238[交通运输工程—道路与铁道工程] U448.2[建筑科学—桥梁与隧道工程]