摘要
目的对比T构-单悬臂连续施工、逐跨连续悬臂施工和顶推施工3种施工方法,确定适合下弦开敞桁式波形钢腹板组合箱梁桥的施工方法。方法应用有限元软件分析3种施工方法对波形钢腹板组合箱梁桥的影响,建立组合箱梁桥的局部三维精细模型,分析顶推法施工过程中体系转化和局部受力的变化规律。结果在施工过程中,顶推施工整体的弯矩、剪力以及变形较小。顶推施工中,导梁的拆除对体系影响较小,而临时墩拆除对顶推施工有较大影响,会导致弯矩、剪力和位移均大幅增长,但增长后数值小于其他两种悬臂施工法。在最大悬臂工序时,导梁前端挠度变形最大,满足《公路桥涵施工技术规范》(JTG/TF50—2011)要求。导梁腹板在支座处由于受到支反力的集中作用,部分拉应力较大,但分布范围较小,总体上剪力滞影响程度小。结论利用顶推法对下弦开敞桁式波形钢腹板组合箱梁桥进行施工,可行性和安全性较高。
By comparing the three construction methods of continuous construction of T-shaped single cantilever,span by span continuous cantilever construction and jacking construction,the construction method suitable for combined box-girder bridge with corrugated steel webs and open bottom truss is determined.Influence of the three construction methods on the structure is comprehensively analyzed by the finite element software;the local three-dimensional model of the composite box girder bridge is established,and the system transformation and local stress variation law in the process of jacking construction are studied.It is found that in the construction process,the bending moment,shear force and deformation of jacking construction are small.Furthermore.The results show that the demolition of the assistant beam has little influence on the mechanical system,while the demolition of the temporary pier has great effects on the jacking construction,which could increase the bending moment,shear force and displacement,but the increased value is still smaller than the other two cantilever construction methods;In construction process of the maximum cantilever,the front end of assistant beam has the largest deflection,while it still meets the specification(JTG/T F50—2011)requirements.Due to the concentrated action of the reaction force,the tensile stress in the web of the guide beam is larger,but with a limited distribution range,and the influence of shear lag is small.It is feasible and safe to construct combined box-girder bridge with corrugated steel webs and open bottom truss by using the jacking construction.
作者
吴丽丽
邹悟
耿大林
于雅倩
WU Lili;ZOU Wu;GENG Dalin;YU Yaqian(School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing,China 100083)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
CSCD
北大核心
2022年第3期427-435,共9页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(52178177)。
关键词
波形钢腹板
组合箱梁桥
悬臂施工
顶推施工
体系转化
corrugated steel webs
combined box-girder bridge
cantilever construction
jacking construction
system transformation
