大跨斜撑钢结构预应力基础施工全过程受力分析

Stress Analysis of Prestressed Foundation Construction Process of Long⁃span Slanted Brace Steel Structure

大跨斜撑钢结构被广泛应用于大型遗址保护工程,基于此,对钢结构基础预应力施工全过程进行研究,发现在结构自重和施工荷载的作用下,柱脚会产生较大的水平推力。由于桩基础的水平承载能力有限,在桩帽之间安装预应力基础梁,以平衡上部结构的水平荷载分量。通过数值模拟对工程实例进行施工分析,以确保关键构件的应力和桩顶位移在极限范围内。

The long-span slanted steel structure is widely used in the conservation of large sites.Based on this,this paper studies the whole process of prestressed construction of steel structure foundation.It is found that the column foot will produce large horizontal thrust under the action of the structure’s dead weight and construction load.Since the horizontal bearing capacity of the pile foundation is limited,prestressed foundation beams are installed between the pile caps to balance the horizontal load component of the superstructure.Simulation is used to analysis the construction of engineering examples to ensure that the stress of key components and the displacement of pile top are within the limit range.