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索穹顶屋盖为何称作创新型预应力钢结构?

发布时间:2015-9-10 9:42:07 浏览次数:599




众所周知,承重结构体系中具有三类基本杆件:一是轴向拉杆,二是轴向压杆,三是受弯曲杆。轴向拉杆最好,最省,可全部发挥材料强度潜力。轴向压杆稍差,受长细比影响折减强度。受弯曲杆最差,由边缘应力控制设计,强度只能发挥50%左右。

因此,在20世纪50年代末,笔者曾对理想的预应力钢结构体系做过预言:“在这种结构体系中具有最多数量的柔性拉杆,这些拉杆由于预应力的作用,既可承受拉力,又可承受压力。
基本为轴向受压的杆件代替了受弯杆件……只有这种新型体系的建立,才能利用‘预应力’在钢结构领域中进行‘革命’,而不是在传统形式上或局部地改进“。所幸而言中,1988年汉城奥运会及1996年亚特兰大奥运会的主要比赛馆索穹顶屋盖就证实了笔者的预言。它们的用钢量只有传统结构的1/10或更少,具有最大的结构效率和最小的结构材料消耗。索穹顶采用了大量拉索为主要受力杆件,采用了少量必要的轴向压杆作为拉杆系间的平衡杆。

至于受力最差的弯矩杆件,则全部从屋盖中摒弃。成为一个名符其实的“零弯矩杆”的横向承重结构体系。与我国的“鸟巢”相比,在各个方面都有天壤之别。经过20年的奋斗,我国的土建工作者终于在2011年,在鄂尔多斯伊盟建造起首座索穹顶的体育中心。



As is known to all, bearing structure system has three kinds of basic bar: one is the axial tension bar, the second is the axial compressive bar, three is the curved rod. The axial tension bar is best, the most provinces, it can play all potential strength of materials. The axial compressive bar is a bit poor, affected by the slenderness ratio reduction intensity. The bending pole worst, by the edge stress control design, strength can only play around 50%.

Therefore, in the late 1950 s, the author has made predictions of ideal of prestressed steel structure system: "in this kind of structure system has the highest number of flexible rod, the rod due to the effect of prestress, can withstand the tension, but also under pressure.

Basic for axial compression bar instead of bending bar... Only the establishment of the new system can use 'prestressed "revolution" in the field of steel structure, rather than in traditional form or locally improved ". But in terms of the 1988 Seoul Olympics and the 1996 Atlanta Olympics main cable dome roof is confirmed from 16:00 the predictions. They use steel quantity only 1/10 or less of traditional structure, has the structure of the maximum efficiency and minimum structure materials consumption. Using a large number of cable dome as the main force bar lasso, use a small amount necessary axial compressive bar as a lever between the balance beam.

As to the worst of the force, bending moment bar all abandon from the roof. To become a real "zero moment bar" lateral load-bearing structure of the system. Compared with the "bird's nest" in our country, there is much difference in all aspects. After 20 years of struggle, our country's civil workers finally in 2011, and built up the first cable dome in the ordos' sports center.


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