K8型单层球面网壳支座减震

为了对跨度为60 m的K8型单层球面网壳进行了减震分析,分别将结构的支座设置成弹性支座和弹性阻尼支座,对结构进行减震控制.结合对结构在有控和无控状态下自振特性的分析,阐述了单层球面网壳结构的减震控制原理.在常遇地震作用下,得到网壳结构的最大水平位移、减震支座的最大水平位移、最大支座反力和最大杆件内力.通过改变支座的刚度和阻尼系数,对两种减震方案的减震效果进行比较.研究结果表明:两种减震装置均有效地控制了K8型单层球面网壳结构的支座反力,弹性阻尼支座还可以明显地降低减震支座的水平位移.

Seismic Reduction of Single-layer Reticulated Domes under Earthquakes

In this paper, vibration reducing analysis was carried out for K8 single-layer reticulated domes in which all horizontal pin supports were changed as spring supports or damped spring supports, respectively. The differences of the frequencies and the vibration modes between uncontrolled and controlled structures were studied in order to illustrate the vibration reducing mechanism of the reticulated domes. The maximum horizontal displacement, the maximum reactions at supports and the internal forces of the reticulated domes were calculated under frequent earthquakes. The results have indicated that two kinds of vibration reducing techniques can control the reactions of this kind of reticulated dome effectively. Damped spring supports can also reduce the displacements at those horizontal supports significantly.