高铁高墩大跨度连续刚构固结体系设计方案  

Restraint System Design Scheme of High Pier and Long Span Continuous Rigid Frame of High Speed Railway

作　　者：王江波 李铭伟 孙大斌 邢继胜 WANG Jiangbo;LI Mingwei;SUN Dabin;XING Jisheng(China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308

出　　处：《铁道建筑》2024年第10期52-57,共6页Railway Engineering

基　　金：中国铁路设计集团有限公司科技开发课题(2021B240609)。

摘　　要：为确定高铁高墩大跨度连续刚构合理的固结体系,以沈白高铁头道松花江特大桥主桥(75+136+136+75)m连续刚构为研究对象,采用MIDAS/Civil建立全桥空间有限元模型,研究分析单固结体系、两固结体系和三固结体系下结构内力、刚度、徐变、轨道平顺性、经济性。结果表明:主梁、主墩内力方面,三固结体系内力最大,单固结体系内力最小,两固结体系介于两者之间;刚度方面,三固结体系整体刚度最大,单固结体系整体刚度最小,两固结体系介于两者之间;徐变方面,满足徐变要求时结构所需梁高从小到大依次为单固结体系<两固结体系<三固结体系;轨道平顺性方面,采用中点弦测法、矢距差法检算时,三种体系均满足规范要求。采用竖曲线半径法检算时,结构所需梁高从小到大依次为单固结体系<两固结体系<三固结体系;经济性方面,两固结体系经济性优于单固结体系。In order to determine a more reasonable restraint system of high piers and long span continuous rigid frame of high speed railway,the main bridge of the Toudao Songhua River super large bridge on the Shenyang-Baishan high speed railway,a continuous rigid frame with a span of(75+136+136+75)m,was taken as the research object.A full-bridge spatial finite element model was established by using MIDAS/Civil to investigate and analyze the internal forces,stiffness,creep,track regularity,and economy of the structure under the single restraint system,double restraint systems,and triple restraint systems.The results indicate that in terms of the internal forces of the main girder and main piers,the internal forces of the triple restraint systems are the greatest,those of the single restraint system are the smallest,and those of the double restraint systems are intermediate.In terms of stiffness,the overall stiffness of the triple restraint systems is the largest,that of the single restraint system is the smallest.that of the double restraint systems is intermediate.In terms of creep,when the creep requirements are satisfied,the required beam height of the structure in the single restraint system is less than that in the double restraint systems,which is less than that in the triple restraint systems.In terms of track regularity,when checked using the midpoint chord measurement method and the vector difference method,all three systems meet the specification requirements.When checked using the vertical curve radius method,the required beam height of the structure in the single restraint system is less than that in the double restraint systems,which is less than that in the triple restraint systems.In terms of economy,the economy of the double restraint systems is superior to that of the single restraint system.

关 键 词：高铁桥梁 高墩 连续刚构 固结体系 刚度 轨道平顺性 

分 类 号：U448.13[建筑科学—桥梁与隧道工程]