论文部分内容阅读
将索杆及节点自重转化为等效节点荷载,提出了圆形平面Levy型索穹顶考虑自重的初始预应力分布简捷计算法。该方法从节点平衡关系入手,推导了不设内环和设内环的Levy型索穹顶考虑自重的初始预应力分布公式。比较了相同中心压杆预应力水平时,索穹顶考虑自重与理想初始预应力分布的差异,以及理想初始预应力分布的索穹顶结构体系在自重荷载下的节点位移。计算结果表明:索穹顶初始预应力考虑自重后,内圈脊索和内圈环索内力降低,其余杆件内力增加。理想初始预应力分布的索穹顶结构体系在自重荷载下节点位移较大,较大偏离了建筑师的设计外形。最后给出了索穹顶考虑自重的初始预应力分布设计流程。
In this paper, the simple calculation method of the initial prestress distribution of round-shaped Levy cofferdams considering self-weight is proposed. This method starts with the equilibrium of nodes, and deduces the formula of the initial prestressing force for the Levy cable dome without inner ring and inner ring. Comparing the prestressing force of the same center strut, the discrepancy between the self-weight and the ideal initial prestressing force of the cable dome and the displacement of the cable dome structure under the self-weight load with ideal initial prestressing force are also analyzed. The calculation results show that when the initial prestressing force of the cable dome is considered self-weight, the internal forces of the inner ridges and the inner ring hoop cables decrease, and the internal forces of the remaining rods increase. The cable dome structure with ideal initial prestress distribution displaces greatly under the self-weight load, which greatly deviates from the architect’s design shape. Finally, the design flow of cable dome considering initial weight distribution is given.