铅挤压阻尼器对网壳结构的减振控制

Vibration control for reticulated shell structure with lead extrusion dampers

将具有良好耗能特性的铅挤压阻尼器加设到大跨空间网壳结构中,通过LS-DYNA软件对结构进行了减振效果分析.以施威德勒球壳为例,分析了铅挤压阻尼器不同布置位置对大跨空间网壳结构减振效果的影响,其中阻尼器的布置分别为交叉支撑布置、斜撑布置和混合支撑布置,综合分析表明,在混合支撑布置铅挤压阻尼器的条件下,铅挤压阻尼器减振系统的减振效果最佳,结构顶点位移被降低60.0%.同样在混合支撑布置铅挤压阻尼器的条件下,通过使用IDA的分析方法研究了该减振系统对大跨空间网壳结构倒塌临界荷载的影响,结果表明结构整体倒塌临界荷载提高了0.33倍.

The vibration control of long-span space reticulated shell structure incorporated with lead extrusion dampers with excellent energy dissipation was studied.The mathematic models on the structure with the dampers were established by using LS-DYNA software.Based on the dynamic analysis of the Schwedler reticulated shell structure,the influences of different damper arrangements on the effectiveness of the vibration control were investigated.The layouts of the dampers were the cross bracing arrangement,inclined bracing arrangement and mixed bracing arrangement,respectively.Comprehensive analysis results show that the vibration control effect of the lead extrusion damper system is optimal under the mixed bracing arrangement,and the vertex displacement response is reduced by 60.0%.Meanwhile,the influences on collapsed critical loads of the long-span space reticulated shell structure are also studied by IDA analysis under the mixed bracing arrangement of the lead extrusion dampers.The results show that the collapsed critical load increases 0.33 times compared to that without dampers.