点支承斜放四角锥网架的研究与应用

Study and application of point supported diagonal square pyramid grids

双层平板型斜放四角锥网架节点构造简单,受力合理,用钢量是四角锥体系网架中最小的一种形式,也是国内工程中应用较多的一种。但这种网架只适宜应用于周边支承的情况,若为四点支承,属几何可变体系,结构不能成立。本文介绍一种斜放四角锥网架———封闭型四点或多点支承斜放四角锥网架,它既可用于周边支承,也可用于点支承。

Double layer flat diagonal square pyramid grids has the advantages of being simple in formation,rational in member stressing and fairly economic of steel cost among square pyramid grids system. Therefore it is one of the most widely used geometrical types in grid projects all over the country. But it is only feasible to peripheral supporting condition. Given the boundary condition of four point supporting or multi point supporting, it is structurally transformable and not workable. This paper has introduced a special type of diagonal square pyramid grids——confined four point supported or multi point supported diagonal square pyramid grids, which is applicable to either peripheral supporting or four point or multi point supporting conditions.