摘要
大跨度桥梁索塔横梁支架支撑体系测试分析是保障桥梁施工安全的关键手段。横州大桥为主跨400 m的单跨双铰钢箱梁悬索桥,桥塔上横梁采用牛腿支架法施工。文章设计了上横梁施工牛腿高支架支撑体系,开展了施工过程中支架体系受力实测,建立了分步施工有限元模型,并计算、分析了上横梁施工过程中支架支撑体系的结构安全性。结果表明:横梁已浇筑结构在张拉预应力形成刚度后,能够与支架支撑体系共同承载并分担大部分的后期荷载,引起钢管支架各测点在腹板浇筑及后续施工中实测应变发展相对较小;数值模型计算应变结果与实测结果总体吻合良好,可较好地应用于支架支撑体系上横梁分步施工的计算分析;所提出的支架支撑体系能够较好地满足大桥上横梁施工的安全性要求。
Measurement and analysis of bracket support system for pylon cross beam of long-span bridge is a key mean to ensure the bridge construction safety.The Hengzhou Bridge is a single-span double-hinged steel box girder suspension bridge with a main span of 400 m,whose upper cross beam of pylon was constructed by corbel bracket method.In this paper,a high corbel bracket support system for the construction of the upper cross beam of Hengzhou Birdge was designed,and the stress changes of the bracket system during the construction process were measured and analyzed.The finite element model of the step-by-step construction was established,and the structural safety of the bracket support system during the construction of the upper cross beam was calculated and analyzed.The results show that the poured structure of the cross beam can bear loads together with the bracket support system and share most of the later loads after tensioning prestress forming stiffness,resulting in relatively small strain development at each measurement point of the steel pipe bracket during the web pouring and subsequent construction steps.The calculated strain results of the numerical model are generally in good agreement with the measured results,so the numerical model can be used in the calculation and analysis of the step-by-step construction of the bracket support system for the upper cross beam.The proposed bracket support system can effectively meet the structural safety requirements the construction of the upper cross beam of the bridge.
作者
荀敬川
邱宏亮
李宁
贾春雨
朱经纬
王明
XUN Jingchuan;QIU Hongliang;LI Ning;JIA Chunyu;ZHU Jingwei;WANG Ming(CSCEC Road and Bridge Group Co.,Ltd.,Shijiazhuang 050001,China;Green Construction Technology Innovation Center of Highway Engineering in Hebei Province,Shijiazhuang 050001,China;Zhejiang Lancheng Binhua Construction Management Co.,Ltd.,Hangzhou 310063,China;School of Transportation Engineering,Shandong Jianzhu University,Jinan 250101,China)
出处
《山东建筑大学学报》
2024年第5期117-124,共8页
Journal of Shandong Jianzhu University
基金
国家自然科学基金项目(51908337)。
关键词
悬索桥
横梁施工
钢管支架
有限元法
应力
suspension bridge
cross beam construction
steel pipe bracket
finite element method
strain
