金属橡胶阻尼器对强震下大跨度网壳的减振控制研究

Vibration Damping Control of Long-span Reticulated Shells by Metal Rubber Damper

目的为提高大跨度网壳在强震作用时的抗倒塌能力,提出了金属橡胶阻尼器.方法将阻尼器引入到大跨度网壳中进行了强震下大跨度网壳减振控制,以凯威特网壳为例,利用IDA法对比分析未受控状态和阻尼器不同布置方式的控制状态的速度及结构整体倒塌临界荷载,其中阻尼器布置分为斜杆布置、环杆布置、混合布置.结果3种布置金属橡胶阻尼器方式分别降低网壳顶点的竖向速度时程响应约30.3%、28.7%、31.6%;同时环杆布置阻尼器时阻尼器用量相对较合理,降低地震对结构的破坏及提高结构抗倒塌能力程度最大,提高结构倒塌的临界荷载值大约29.6%.结论3种阻尼器布置方式的降低网壳顶点的竖向速度时程响应效果相当,选用环杆布置金属橡胶阻尼器进行大跨度网壳的减振控制效果较好.布置金属橡胶阻尼器可以很好地降低地震波对网壳的破坏,对结构抗倒塌能力的提高显著.

In order to improve the collapse resistance of the large-span reticulated shell under strong earthquakes,a metal rubber damper was proposed.The damper was introduced into the large-span reticulated shell to control the vibration of the large-span reticulated shell under strong earthquakes.Wittur reticulated shell was taken as an example.The IDA method is used to compare and analyze the uncontrolled state and the control state speed and the critical load of the structure collapse in different arrangements of dampers.The arrangement of dampers is divided into inclined rod arrangement,ring rod arrangement,and mixed arrangement.Results showed that the three ways of arranging metal rubber dampers reduced the vertical velocity time history response of the apex of the reticulated shell by approximately 30.3%,28.7%,and 31.6%.The amount of dampers was relatively reasonable when the dampers were arranged on the ring rod,which reduced the seismic damage to the structure and the improvement of the structure’s ability to resist collapse are the greatest,and increased the critical load value of the structure collapse by about 29.6%.The three dampers arrangements have the same effect in reducing the vertical velocity of the apex of the reticulated shell.The metal rubber damper has a better effect on the vibration reduction control of the large-span reticulated shell.The arrangement of metal rubber dampers can reduce the damage of the seismic wave to the reticulated shell,and significantly improve the collapse resistance of the structure.