摘要
罗水大桥位于武广铁路客运专线上,跨越罗水河的主桥为跨径(48+80+48)m的三跨预应力混凝土连续梁桥,桥上铺设无碴轨道,设计速度350 km/h,主梁采用分段悬臂法施工。由于无碴轨道扣件调节量有限,相比于普通连续梁桥,高速铁路无碴轨道大跨度连续梁桥对成桥线形控制更为严格。为了使该桥的成桥线形达到设计要求,利用桥梁博士有限元软件模拟施工过程,根据桥梁变形和受力情况预测施工预拱度,监测施工过程和成桥状态下的桥梁线形和受力状态。控制结果表明,施工过程中和成桥状态下,桥梁线形顺畅,合龙口主梁高程误差小于10 mm,主梁受力状况良好,达到监控目标。
The Luoshui Bridge is located on Wuhan-Guangzhou Passenger Dedicated Railway.The main bridge of the bridge over the Luoshui River is a 3-span prestressed concrete continuous girder bridge with span arrangement（48＋80＋48） m and the main girder is constructed by the cantilever segmental concreting method.On the deck of the bridge,the ballastless tracks are laid and the designed traveling speed is 350 km/h.Owing to the restricted adjustment capacity of the fasteners for the ballastless tracks,the alignment control of the completed bridge of a long span high-speed railway continuous girder bridge is more demanding as compared to that of a common continuous girder bridge.To ensure that the alignment of the Luoshui Bridge can eventually conform to the design requirements,the finite element software Bridge Doctor is used to simulate the construction process,to predict the construction pre-cambering according to the deformation and mechanical behavior of the bridge and to monitor the alignment and force conditions of the bridge in the construction process and in the completion state.The results of the control show that the alignment of the bridge in either the construction process or the completion state is smooth,the differences of elevation of the main girder at the closure gaps are less than 10 mm,the force conditions of the main girder are good and can meet the goal set in the control.
出处
《桥梁建设》
EI
CSCD
北大核心
2011年第3期76-80,共5页
Bridge Construction
关键词
连续梁桥
无碴桥面
施工控制
有限元法
continuous girder bridge
ballastless deck
construction control
finite element method
