短程线型单层网壳结构隔震机理研究

Isolation mechanism analysis of single layer geodesic latticed shell

将短程线型网壳结构的支座设置成隔震支座,对结构进行了隔震控制,分别采用弹簧支座和弹簧阻尼支座对结构进行了控制.分析了结构振型和频率在有控和无控状态下的区别,研究短程线型网壳结构的隔震控制机理.在常遇和罕遇地震作用下,计算网壳结构的最大水平位移、隔震支座的最大水平位移和最大支座反力.研究结果表明:两种隔震装置均有效地控制了短程线型网壳结构的支座反力,弹簧阻尼支座还明显地减少了隔震支座的水平位移.

Isolation control analysis was carried out for geodesic latticed shell in which all horizontal pin supports were changed as spring supports or damped spring supports. The differences of the vibration modes and the frequencies between uncontrolled and controlled structure were studied for analyzing the isolation mechanism of isolated geodesic latticed shell. The structural maximum horizontal displacement, the maximum horizontal displacement at isolators and maximum reactions at supports were calculated under frequent earthquakes and rare earthquakes, respectively. The results indicate that two kinds of isolation devices can control the reactions of geodesic latticed shell effectively. Damped spring supports can also reduce the displacements at those isolated supports significantly.