摘要
以南宁英华大桥为工程背景,分析单主缆悬索桥主梁顶推施工技术的原理和实施过程,采用有限元,计算分析了在顶推施工中钢箱梁的力学特征和局部受力情况,评价了钢箱梁顶板、底板、横隔板和纵隔板在顶推过程中的受力情况及其安全性。结果表明:在顶推施工过程中,钢箱梁顶板、底板和横隔板等部位局部应力较大,当钢箱梁顶推最大悬臂35 m、导梁25 m时,各部件所受应力最大,步履机支点的反力最大,为最不利工况,最大应力出现在纵隔板横向加劲肋与底板横向加劲肋相交处,尽管满足安全要求,但在进行设计时应进行加强处理,以免应力集中。
Taking the Nanning Yinghua Bridge as the engineering background,the principle and implementation process of the jacking construction technology of the main girder of a single main cable suspension bridge were analyzed.The mechanical characteristics and local forces of the steel box girder in the construction of the jacking were calculated and analyzed using finite element.The force condition and safety of the top plate,bottom plate,transverse partition and longitudinal partition of steel box girder during the jacking process are evaluated.The results show that during the jacking construction process,the top plate,bottom plate and diaphragm of the steel box girder have higher local stresses.When the steel box girder is jacked up to the maximum cantilever of 35 m and the guide beam of 25 m,the stress on each component is the largest.The machine fulcrum has the largest reaction force,which is the most unfavorable working condition.The maximum stress occurs at the intersection of the transverse stiffener of the medial plate and the transverse stiffener of the bottom plate.Although the safety requirements are met,the design should be strengthened to avoid stress concentration.
作者
黄宗光
罗天
HUANG Zongguang;LUO Tian(Nanning Urban Construction Group,Nanning 530033;Sichuan Highway Planning,Survey,Design and Research Institute Ltd,Chengdu 610041)
出处
《公路交通技术》
2021年第4期83-88,共6页
Technology of Highway and Transport
关键词
顶推法
钢箱梁
有限元模型
受力分析
incremental launching method
steel box girder
finite element model
stress analysis
