论文部分内容阅读
通过索穹顶结构对称性及节点平衡、力矩平衡,推导出竖向荷载由中心向外逐圈传递的各肢竖向力及水平力计算式;根据每肢所传递的竖向力及水平力大小,推导出脊索和斜索初始预应力计算式以及环向索和撑杆初始预应力计算式。对于Levy型索穹顶结构,当相邻2圈节点数变化时,内圈对外圈会出现3肢节点,成为混合型索穹顶,将3肢分为两类,推导了不同肢所传递竖向力和水平力计算式,从而得到了此类索穹顶初始预应力计算方法。新方法将索穹顶初始预应力分为两部分:一部分为竖向荷载下最小初始预应力值,一部分为预应力自平衡部分,其中,自平衡部分整体成线性变化,因此,可以通过提高最内节点上端径向水平合力大小提高整个索穹顶结构的初始预应力水平,从而满足各种荷载工况下的受力要求。最后,通过一个算例介绍了新方法的计算过程并验证了该方法的正确性。
According to the structure symmetry of the cable dome and node balance and moment balance, the formula of vertical force and horizontal force of each vertical force transferred from center to outer circle is deduced. According to the vertical force and horizontal force , The formulas for calculating the initial prestressing force of the ridges and the cords and the formulas for calculating the initial prestress of the hoop cables and struts are deduced. For the Levy cable dome structure, when the number of nodes in two adjacent rings changes, the inner ring will have 3 limbs on the outer ring and become a hybrid cable dome. The three limbs are divided into two types, and the vertical forces transmitted by different limbs are deduced And the calculation formula of horizontal force, so as to obtain the initial prestressing calculation method of such cable dome. The new method divides the initial prestress of the cable dome into two parts: one is the minimum initial prestress value under vertical load, and the other is the prestress self-balance part, in which the self-balance part changes linearly as a whole. Therefore, The radial horizontal force of the upper end of the node increases the initial prestressing force of the entire cable dome structure, so as to meet the stress requirements under various load conditions. Finally, a calculation example of the new method is introduced and the correctness of the method is verified.