金台铁路156 m简支系杆拱结构设计与分析  

Structural Design and Analysis of 156 m Span Simply Supported Tied-arch Bridge on Jinhua-Taizhou Railway

作　　者：王冰 WANG Bing(China Railway Fifth Survey and Design Institute Group Co.Ltd.,Beijing 102600,China)

机构地区：[1]中铁第五勘察设计院集团有限公司

出　　处：《铁道建筑》2019年第12期11-15,59,共6页Railway Engineering

摘　　要：新建金台铁路(金华-台州)以小角度斜交跨越既有台金高速公路且桥下净空受限,主跨采用156 m简支系杆拱桥,矢跨比1/5,拱肋采用钢管混凝土哑铃形结构,为目前国内单线铁路同类型桥梁最大跨度。采用空间杆系和实体有限元分析方法,对结构的各项静力指标、拱脚局部受力、屈曲稳定进行分析,同时对全桥进行车桥耦合仿真分析。研究结果表明,本桥采用刚性系杆刚性拱结构,各项受力性能均满足规范相关规定,并具有良好的动力性能。合理布置第1道横撑,拱顶采用X形加强横撑,能显著提高结构稳定性。采用加长拱脚及梁端实体段长度、设置三向预应力体系、局部加强配筋等措施,可有效解决大跨度系杆拱拱脚受力较大问题。The newly-built Jinhua-Taizhou railway crosses over the existing Taizhou-Jinhua expressway at a small angle with limited clearance under the bridge.The main span is 156 m span simply supported tied-arch bridge with a rise span ratio of 1/5,which is the largest span of the same type of bridge in the domestic single track railway at present.The arch rib is concrete-filled steel tube dumbbell structure.The static indexes,local stress of arch foot and buckling stability of the structure were analyzed by using the method of spatial bar system and solid finite element analysis.At the same time,the vehicle-bridge coupling simulation analysis was carried out for the whole bridge.The research results show that the bridge adopts rigid tied-rod and rigid tied-arch structure,all the mechanical properties can meet the relevant provisions of the code,and it have good dynamic performance.Reasonable arrangement of the first cross brace and X-shaped strengthening of the vault can significantly improve the structural stability.The measures such as increasing the length of arch foot and girder end solid section,installing three-direction prestressed reinforcement system,strengthening local reinforcement and so on can effectively solve the problem of large span tied-arch foot stress.

关 键 词：铁路桥梁 桥梁设计 数值模拟 系杆拱 先梁后拱法 钢管混凝土 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]