多次预应力钢网壳屋盖设计中应注意的几个问题

SEERAL DEY PROBLEMS OF DESIGN FOR MULTI-PRESTRESSED STEEL LATTICED SHELLL ROOF

多次预应力钢网壳是一种新型高效空间结构体系.本文通过攀枝花体育馆网壳屋盖的设计实践,探索了在先进的大跨网壳结构中两次引入预应力,对其荷载作用下的内力与变形进行控制,以降低基本结构的峰值应力;在预应力作用下,预加力节点汇交杆的应力集中;预应力节点的构造设计;支座约束模式对网壳杆件内力的影响以及预加力的合理取值等问题.可供设计这种先进结构时参考.

ABSTRACT The multi - prestressed steel latticed shell is a new spacial structural system of high efficiency. The following problems are explored through the design practice of steel latticed shell roof for Panzhihua Gymnasium: such as the prestress is led twice to the advanced latticed shell of large span to control its inner forces and deformations under loadings, so as to reduce the peak stress of the basic structure; the stress concentration of the intersection bar at the prestressed node under the action of the prestresses; the structural design of the prestressed node; the effect of the support restrained mode on the inner forces of the members for the latticed shell, as well as determining properly the prestress, etc. These can be a reference for designing the advanced structure.