摇摆墙在框架结构抗震加固中的应用

Seismic retrofit of frame structures using rocking wall system

介绍一种摇摆墙体系及其在框架结构抗震加固中的应用。摇摆墙是采用特殊构造、底部具有一定转动能力和较大抗侧刚度的结构墙体,它能够有效控制结构在地震作用下的侧向变形模式,且能够以多种方式与消能减震装置结合,提高结构的耗能能力,进而提升结构整体的抗震能力。通过集中质量层模型的动力弹塑性分析研究了摇摆墙的刚度需求,介绍国际上首个采用摇摆墙体系抗震加固的11层钢骨混凝土框架结构实例,并对加固前后的结构抗震性能进行对比分析。结果表明,摇摆墙体系能够有效降低结构在不同地震动输入下的平均地震响应,且可显著减小结构地震响应的离散性,使结构的损伤模式和抗震性能更加易于控制。

An innovative seismic passive control system of rocking walls was introduced.Rocking walls are specially-detailed structural walls with finite rotating capacity at the base and large lateral stiffness.The rocking wall system is capable of controlling the lateral deformation pattern of the building structure and allows flexible arrangement of energy dissipation devices in order to increase the energy dissipation capacity of the building.Stiffness demand for the rocking wall was studied through nonlinear dynamic analysis of lumped mass model with vertically continuous components.An application of the rocking wall system to the seismic retrofit of an 11-story steel reinforced concrete frame was introduced.The seismic performances of the structure before and after the retrofit were compared through nonlinear dynamic analysis.Results show that the rocking wall system can significantly reduce the seismic responses to different earthquake ground motions as well as their dispersions.This makes the damage mechanism and the seismic performance of the retrofitted building more predictable.