摘要
以某铁路专用线上一座(48+80+48) m连续梁桥为工程背景,研究关于悬臂浇筑施工合龙方案对主桥施工过程中应力与挠度以及成桥线形的影响。根据该桥设计特点以及施工可行性,拟定4种不同的合龙方案,并对其进行有限元仿真研究。研究结果表明:不同的合龙方案对桥梁施工过程以及成桥后的应力、挠度有较大的影响;选择在拆除挂篮后,先边跨后中跨浇筑的合龙方案可以有效地减小桥梁施工过程中主桥应力以及挠度,对成桥线形能更好地控制。在该合龙方案下,考虑温度的影响对其中跨合龙段劲性骨架进行合理设计。研究成果可为该类型连续梁合龙施工方案的选择提供参考。
Taking a(48+80+48)m continuous beam bridge in a railway special line as the engineering background,the influence of the closure scheme on the stress and the deflection in the cantilever construction process and at the finished bridge state is discussed.According to the design features and construction feasibility of the bridge,four different closure schemes have been studied out.The results of finite element simulation analysis of the four different closure schemes show that:Different schemes have great influences on the stress and deflection in bridge construction process and at finished bridge state.After removing the hanging basket,the closure scheme that pouring between two sides firstly and middle secondly can effectively reduce the stress in bridge construction process,and it can also accurately control the deflection better at finished bridge state.The stiff skeleton of the middle closure section is designed for this superior closure scheme.The research of this paper provides a reference for the selection of the construction scheme of this type of continuous beam bridge.
作者
刘会球
LIU Huiqiu(China Railway 25 Bureau Group 3rd Engineering Co., Ltd, Changsha 410001, China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2019年第3期706-711,共6页
Journal of Railway Science and Engineering
关键词
连续梁桥
合龙方案
成桥线形
劲性骨架
continuous beam bridge
closure scheme
deflection at finished bridge state
stiff skeleton
