摘要
为研究中小跨径连续箱梁分层浇筑过程中支架与已浇筑结构的耦合受力情况,结合现场测试和有限元仿真分析,提出了考虑混凝土材料时间相关属性的阶段施工模拟分析方法,对箱梁第二层混凝土浇筑时支架和已浇筑结构的应力变化情况进行了分析和测试,并将现场采集的支架应力数据与有限元仿真分析数据进行对比校核。结果表明:第一层已浇筑结构会因承受部分第二层浇筑混凝土自重而产生较大应力,必须验算已浇筑结构在分层浇筑施工过程中的结构安全性;相比于一次整体浇筑,分层浇筑混凝土时可有效减小贝雷梁支架和钢管柱承受的第二次浇筑混凝土自重,对贝雷梁应力的减小作用比钢管柱大;已浇筑结构可为贝雷梁支架分担52.98%~86.63%的第二层浇筑荷载,为钢管柱分担15.65%~29.24%的第二层浇筑荷载,因此支架设计时应优化支架的荷载取值;所提出的支架与已浇筑结构耦合受力分析方法具有可靠性。
In order to study the coupled forces between the bracket and the poured structure in the layered casting of small and medium span continuous box girders,combining the field testing and finite element simulation analysis,a stage construction simulation analysis method considering the time-dependent properties of concrete materials was proposed.The stress changes of the bracket and the poured structure during the pouring of the second layer of concrete of the box girder were analyzed and tested.The comparison between the measured data of construction and the results of finite element simulation analysis was carried.The results show that the first layer of the poured structure will bear a large amount of stress due to the weight of some of the second layer of poured concrete,and it is necessary to calculate the structural safety of the poured structure in the process of the construction of the poured structure in layers.Compared with the first overall pouring,the weight of the second poured concrete borne by the Bailey beam support and the steel pipe column can be effectively reduced when the concrete is poured in layers,and the effect on reducing the stress of the Bailey beam is greater than that of the steel pipe column.The poured structure can share 52.98%-84.48% of the second layer pouring load for the Bailey beam support,and share 15.65%-29.24% of the second layer pouring load for the steel pipe column.Therefore,the load value of the support should be optimized in the design of the support.The proposed analysis method for coupling force between bracket and the poured structure has reliability.
作者
许红胜
郭芬
危超
范喜超
罗海伟
XU Hongsheng;GUO Fen;WEI Chao;FAN Xichao;LUO Haiwei(School of Civil Engineering,Changsha University of Science and Technology,Changsha 410114,Hunan,China;Guizhou Highway Engineering Group Third Engineering Co.,Guiyang 550008,Guizhou,China)
出处
《建筑科学与工程学报》
北大核心
2025年第5期66-73,共8页
Journal of Architecture and Civil Engineering
基金
国家自然科学基金项目(52278143)。
关键词
现浇箱梁
分层浇筑
贝雷梁组合支架
耦合受力
有限元模拟
阶段施工
cast-in-place box girder
layered casting
Bailey beam combination bracket
coupled force
finite element simulation
stage construction
作者简介
许红胜(1974-),男,工学博士,副教授,E-mail:Hongsheng74@163.com。
