预应力混凝土框架结构顶层边柱设计

Design of Side Column of Highest Floor in Prestressed Frame

在混凝土框架结构中,顶层边柱具有轴力小而弯矩大的特点,尤其在建筑需要大空间而抽掉顶层中间柱时,此特点更为突出,在设计中经常碰到柱截面尺寸过大或者超筋现象,成为设计中的难点之一。通过对不同的几种处理方法比较分析,提出了在柱子中布置预应力高强钢绞线的解决办法,对其设计要点进行了探讨。最后通过具体工程实例验证了设计方法的有效性。

In prestressed concrete frame, due to the large span, the side column of the highest floor has large moment with little axial force. So the design of this column become one of the difficulties, especially in situation that in the highest floor some columns have to be cancelled. By comparison of the several design methods, prestress technology was introdud, and the design features were discussed. At last, an example was givc out.