大跨空间网架结构铅挤压阻尼器减振控制分析

摘要

为了研究铅挤压阻尼器减振系统对大跨空间网架结构的减振控制效果,对铅挤压阻尼器的滞回耗能特性进行了试验研究与分析,结果说明铅挤压阻尼器性能稳定,是一种优秀的耗能减振装置.使用有限元软件LS-DYNA建立大跨空间网架结构的计算模型,分别对铅挤压阻尼器在网架结构中不同布置位置下的各种工况进行了减震效果对比分析,得到了铅挤压阻尼器在大跨空间网架中布置的合理位置.同时在铅挤压阻尼器合理布置位置的条件下,研究了铅挤压阻尼器减振系统对大跨空间网架倒塌极限荷载的影响.结果表明:铅挤压阻尼器减振系统能够有效降低大跨空间网架结构的地震响应；而且在合理布置阻尼器的情况下,减振系统更能够提升大跨空间网架结构的倒塌临界荷载.%In order to study vibration control effect of long-span space lattice structure with lead extrusion dampers vibration reducing system,hysteretic energy dissipation characteristics for lead extrusion damper are studied. The results show that lead extrusion damper is an excellent energy dissipation device in which energy dissipation is stable. Based on the finite element software LS-DYNA, long-span space lattice structure model is established, and then, the influences of three different arranging positions of lead extrusion dampers on the effectiveness of the vibration control are investigated, and relatively reasonable position is obtained. Finally, the influences on collapsed critical loads of long-span space lattice structure are also studied under the conditions that lead extrusion dampers are positioned reasonably. It is proved by numerical results that the vibration reducing system of lead extrusion damper is excellent for large-span space lattice structure, and the collapse critical loads of long-span space lattice structure also can be effectively improved by a reasonable arrangement of lead extrusion dampers.