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摇摆结构是一种新型抗震结构体系。摇摆结构通过释放某些部位的约束,允许结构相应位置发生相对位移,从而改变构件的受力状态,改善结构的抗震性能。框架-摇摆墙结构是摇摆结构的一种,其中摇摆墙能够绕着墙底连接件发生面内转动。墙体底部约束的释放降低了对基础的承载力需求,同时能有效避免地震作用下墙体的损伤。具有较大刚度的摇摆墙能有效地控制结构的变形模式,防止出现变形和损伤集中。在框架-摇摆墙结构中增设阻尼器和预应力钢筋可分别增加其耗能能力并减少震后残余变形。该文提出了框架-摇摆墙结构的分布参数模型,利用该模型分析了摇摆墙刚度对结构侧移分布、摇摆墙和框架承载力需求的影响。研究了摇摆墙在国内某工程抗震加固改造中的应用,提出了摇摆墙加固的具体方法以及连接的局部构造。采用动力弹塑性时程分析的方法,对比了原结构与摇摆墙加固后结构的抗震性能。分析结果表明,摇摆墙加固方案能使塑性铰的分布更加均匀,增设预应力钢筋和金属屈服型阻尼器显著提高了结构耗能能力,减小了结构的残余变形。
Swing structure is a new type of seismic structure system. The rocking structure can release the relative restraint of the corresponding position of the structure by releasing the restraint of some parts so as to change the stress state of the component and improve the seismic performance of the structure. The frame-rocking wall structure is a type of rocking structure in which the rocking wall can rotate in-plane around the wall connector. The release of the restraint at the bottom of the wall reduces the requirement for the bearing capacity of the foundation and can effectively prevent the wall from being damaged by the earthquake. The wobbler wall with greater rigidity can effectively control the deformation mode of the structure to prevent deformation and damage concentration. The addition of dampers and prestressing tendons to the frame-wobbler structure respectively increases their energy dissipation capacity and reduces post-earthquake residual deformation. In this paper, the distribution parameter model of the frame-wobbler structure is put forward. The model is used to analyze the influence of the wobbler wall stiffness on the lateral displacement distribution, the swinging wall and the bearing capacity of the frame. The application of the rocking wall in the aseismic strengthening and reconstruction of a project in China is studied. The concrete method of rocking wall reinforcement and the local structure of the connection are proposed. Using the method of dynamic elasto-plastic time-history analysis, the seismic behavior of the structure after the original structure and the wobbled wall are strengthened is compared. The analysis results show that the swinging wall reinforcement scheme can make the distribution of plastic hinge more uniform, and the addition of prestressed rebar and metal yielding damper significantly improves the energy dissipation capacity of the structure and reduces the residual deformation of the structure.