摘要
小半径曲线连续梁桥在悬臂施工过程中存在明显的弯扭耦合效应,须在中墩支座处设置临时锁定构造以避免不平衡状态造成不利影响,确保施工过程安全。由于缺乏可靠的临时锁定设计验算方法,工程中多采用钢管混凝土临时支墩和墩顶临时支座相结合的方式设置临时锁定,虽然安全储备充分,但造价高昂且施工难度较大。以简化临时锁定构造为目的,通过对临时锁定失效机理的深入研究,提出了适用于小半径曲线梁桥体内临时锁定设计验算的实用方法,从螺纹钢筋验算、支座垫石验算等方面进行了详细论述,并结合精细化有限元模型进行了论证。研究结果表明:本文所提出的锁定设计计算方法具有一定的实用性,对于小半径曲线连续梁桥临时锁定的设计具有一定的参考价值。
There is an obvious bending-torsion coupling eff ect during the cantilever construction of a continuous beam bridge with a small radius curve.A temporary locking structure must be installed at the middle pier support to overcome the adverse effects of the unbalanced state and ensure the safety of the construction process.Due to the lack of a reliable temporary lock design check calculation method,the project often uses the combination of the steel tube concrete temporary support pier and the temporary support at the top of the pier to set the temporary lock.Although the safety reserve is suffi cient,the cost is high and the construction is diffi cult.For the purpose of simplifying the temporary locking structure,through in-depth research on the failure mechanism of temporary locking,a practical method suitable for the temporary locking design check calculation of the small radius curved beam bridge body is proposed.It is discussed in detail and demonstrated in conjunction with the refined finite element model.The research results show that the locking design calculation method proposed in this paper has a certain practicability,and has certain reference value for the temporary locking design of continuous beam bridges with small radius curves.
作者
付长江
FU Changjiang(CHINA MCC5 GROUP Co.,Ltd.,Chengdu Sichuan 610031)
出处
《智能建筑与工程机械》
2021年第9期8-15,共8页
Intelligent Building and Construction Machinery
关键词
临时锁定
小半径
曲线连续梁桥
弯扭耦合
悬臂施工
临时锁定失效
temporary locking
small radius
curved continuous beam bridge
bending-torsion coupling
cantilever construction
temporary locking failure
