基于放大式节点阻尼器的框架结构抗震性能研究

Seismic performance study of frame structures based on displacement enlarged joint damper

针对普通节点阻尼器在层间位移角较小时无法充分发挥阻尼器性能的问题,基于杠杆原理提出一种新型位移放大式节点阻尼器。首先介绍阻尼器的基本构造、工作原理并建立数值模型;然后建立含阻尼器的多尺度框架模型,开展结构静、动力弹塑性分析,探讨位移放大阻尼器与无放大阻尼器对框架结构抗震性能的影响。研究结果表明:放大式节点阻尼器耗能能力为无放大阻尼器的5.7倍;在多遇及罕遇地震作用下,相比布置无放大阻尼器的框架结构,布置放大式节点阻尼器的框架结构基底剪力响应分别减少13%、6%,层间位移角分别减少13%、11%,有效提升了结构的抗震性能。

For ordinary joint dampers cannot give full play to their performance when displacement angle is small,a new type of displacement enlarged joint damper based on lever principle is proposed.Basic structure and working principle of dampers are introduced and numerical simulations are carried out.Multi-scale frame models are established.Static and dynamic elastoplastic analysis is carried out.Effects between enlarged and non-enlarged damper on the seismic performance of frame structures are discussed.Results show that the energy dissipation capacity of the enlarged joint damper is 5.7 times than that that of the non-enlarged damper.Under the action of frequent and rare earthquakes,the base shear response of the frame structures with enlarged joint dampers is reduced by 13%and 6%,and the inter-story drift angle is reduced by 13%and 11%,respectively.Compared with the frame structures with non-enlarged damper,which can effectively improve the seismic performance of the structures.