环向空间预应力结构模型振动台试验研究

某新建国际网球赛馆为大型空间预应力混合结构。其主赛馆看台为倒锥形现浇预应力混凝土结构,屋盖为开闭式钢结构。对该结构进行了缩尺模型的振动台试验,根据几何相似和预应力等效的原则,研究解决了小比例振动台模型中预应力筋配置和预应力施工的技术课题,探索了该类旋转对称、高宽比较小的空间结构不同于普通高层结构的振动测试布置方法。试验验证了这一结构以扭转为主的振型特点,揭示了环向预应力在保证结构维持罕遇地震作用下的整体性上的重要作用,并对工程作出了抗震性能评价。

Shaking table model test for circular spatial and prestressed structure

The newly built international tennis stadium is a spatial and prestressed hybrid structure.The platform of the main stadium is a prestressed concrete structure cast in situ in the shape of inverted cone while the roof part is retractable steel structure.Shaking table test for the scaled model was conducted in accordance with the geometric similarity and prestress equivalency.During the experiment,the prestressed tendon configuration and construction in small ratio scaled model and the dynamic test method for the cyclically symmetric spatial structure with a low ratio of height to width,which is different from the common tall buildings,are well discussed.Through the test,the characteristic of dynamic mode of torsion of the structure is demonstrated.The validity of circular pretressed tendons to maintain the overall performance of the structure under scarce earthquakes is confirmed,and the evaluation of the project is made as well.