某索网结构预应力撑杆柱设计

Design of prestressed prop column in a cable net structure

某索网结构中柱为压弯构件,高度159m,原结构方案采用11m直径圆管,用钢量大。为节省用钢,拟采用预应力撑杆柱。但该柱约束条件较复杂,索网结构竖向有多层径向预应力索与柱子连接,如何考虑此支承作用是设计的一个难点。利用MIDAS Gen程序对该预应力撑杆柱进行了几何非线性屈曲建模分析,得到了柱子计算长度系数,进行了柱稳定性设计,确定了中心压杆、撑杆、索截面规格以及预应力取值。结果表明,与普通钢柱方案比较,预应力撑杆柱方案节省用钢量62.2%。

Central column in a cable net structure is a beam-column,with 159 meters high,which was a circular tube 11 meters in diameter in the primary design scheme.In order to save steel costing,prestressed stayed column was used in the project.The complicated constraints,resulting from cable connections between the column and several layer ring beams,lead to difficult to obtain effective length of column.MIDAS Gen program was applied to build a geometrical nonlinear FE model,and effective calculated length of column was achieved,then stability design was executed,for the cross sections of each components and prestressing forces in cables.The results proved that the prestressed stayed column saved 62.2%steel consumption,compared with ordinary column.