凯威特单层球面网壳结构隔震分析

将凯威特网壳结构的固定支座设置成隔震支座，分别采用弹簧支座和粘弹阻尼支座对结构进行了隔震控制。在有控和无控状态下，计算了凯威特网壳结构的自振频率，初步分析了凯威特网壳结构的隔震控制机理。分别在常遇和罕遇各三种地震作用下，对网壳结构进行了时程分析，对网壳结构的最大水平位移、隔震支座的最大水平位移、最大支座反力和网壳结构的杆件轴力进行了数值计算。研究结果表明：两种隔震装置均有效地控制了凯威特网壳结构的支座反力和杆件轴力，粘弹阻尼支座还明显地减少了隔震支座的水平位移和隔震结构的水平位移。隔震方法对于大跨网壳结构的减振是有效的。

Isolation analysis of single layer Kewitte latticed spherical shell

Isolation control analysis is carried out for Kewitte latticed shell in which all horizontal pin supports were replaced by spring supports or damped spring supports. The differences of the vibration modes and the frequencies between uncontrolled and controlled structure are studied by analyzing the isolation mechanism of isolated Kewitte latticed shell. For the isolated Kewitte structure, its maximum horizontal displacement, the maximum horizontal displacement of isolators, the maximum reactions of supports and the structural element axial forces are calculated under the action of frequent earthquakes and rare earthquakes, respectively. The results have indicated that two kinds of the isolation devices can control the reactions of Kewitte latticed shell effectively. Damped spring supports can also reduce the displacements of the isolated supports and the displacements of the isolated shell significantly. Isolation is effective for reducing the vibration of large span shell.