风荷载作用下上承式钢管混凝土拱桥施工过程静力性能分析

Analysis of Static Performance in the Construction Process of Concrete Arch Bridge of Upper-Carrying Steel Pipe under the Action of Wind Load

钢管混凝土拱桥作为一个内部高次超静定结构,在施工过程中风荷载必将对结构的内力及位移都产生影响。针对这种影响,本文以找龙坝河特大桥的施工情况为例,基于有限元分析方法,建立三维有限元模型,分析了风荷载下钢管混凝土拱桥的静力性能。结果表明,在采用合龙后拆除吊索且上下拱肋分两次灌浆的快速施工方式时,风荷载下主拱圈的受力及位移是满足安全条件的,在施工监控时应当注意拱脚处受力情况。

Steel pipe concrete arch bridge as an internal high-situ super-static structure, the wind load will have an effect on the internal force and displacement of the structure during the construction process. In view of this influence, this paper takes the construction of the Zhaolongba Special Long Span Bridge as an example, based on the finite element analysis method, establishes a three-dimensional finite element model, and analyzes the static performance of the steel pipe concrete arch bridge under the wind load. The results show that when the rapid construction method of removing the sling and two grouting slots is used after the closed, the force and displacement of the main arch ring under the wind load are to meet the safety conditions, and the force conditions at the arch feet should be paid attention to during the construction monitoring.