某工程大跨度预应力空间桁架锚固端支座设计

Design of the Anchoring Support of one Large-span Prestressed Steel Truss

在钢结构中施加预应力,可有效地改善结构内力分布,提高钢材利用率,提高结构刚度,降低支座处水平外推力。但由于钢结构截面小,刚度差,而预应力钢结构支座处锚固端处拉力往往很大,因此,预应力钢结构锚固端支座的设计一直是钢结构工程界的重点、难点。本文结合工程实践,系统地介绍了预应力空间钢桁架的一种新型的锚固端支座节点的设计方法、优点及特点。

Prestess technology adopted in steel structure can effectively improv e the distribution of structural internal forces, improve the steel utilization , enhance the structural rigidity and reduce the level forces of the supports. B ecause of the small sections , low rigidity and large tension to the anchoring s upports, the design of the anchoring supports of the prestressed steel structure is always a important and difficult problem in the steel structure engineering. Based on project practice, the design method, advantages and characteristic of a new type of anchoring support is systemically introduced in this paper.