八角湾国际体育中心游泳馆屋盖结构振动台试验研究OA

The roof structure of Bajiaowan Swimming Pool adopts a steel grid-concrete composite shell,which presents a complex structure system.To investigate the seismic performance of this composite shell,a 1/15-scale model was fabricated according to the prototype structure of Bajiaowan Swimming Pool.Considering the fortification,rare and super-rare earthquakes,the dynamic characteristics,seismic responses,damage evolution and failure modes of the structure were studied by shaking table tests,and the seismic performance of the shell was analyzed.The results show that the vertical vibration of the roof structure is significantly greater than that in the horizontal direction,with the largest vertical responses occurring at the large opening at the top.Initial damage is observed under 7-degree rare earthquakes.Under 9-degree rare earthquakes,the peak vertical displacement is 1/633 of the short-axis span,and the frequencies only decrease by about 10%,demonstrating the excellent stiffness and bearing capacity of the shell.Under the cooperative work of steel and concrete,the structural failure has ductility characteristics.Although there are unfavorable design factors such as large opening at the top and concentrated load,the structure does not form a significant weak part under strong earthquakes,and is a structural form with excellent mechanical properties.