以阻尼器连接的框架-摇摆墙结构在罕遇地震下的抗震分析

Seismic analysis of frame-rocking wall structure connected with dampers under rare earthquake

框架-摇摆墙结构在工程抗震加固中效果显著,但对连接摇摆墙与框架结构刚性杆两端的节点域构造要求高,且在罕遇地震作用下刚性杆易损坏,可替换性低。需要寻求一种能够代替刚性杆的构件作为连接构件。因此,为研究阻尼器作为连接构件的框架-摇摆墙结构在罕遇地震作用下的抗震性能,以某地区一中学的教学楼为研究对象,利用弹塑性分析软件SNAP,建立黏弹性、金属和黏滞阻尼器代替刚性杆作为连接构件的框架-摇摆墙模型,分析对比连接件对框架摇摆墙结构在罕遇地震作用下的影响。结果表明:阻尼器作为连接件不改变传统摇摆墙的作用机理,并能有效控制层间变形;与刚性杆相比,黏弹阻尼器作为主体结构与摇摆墙的连接构件时,具有传递轴力小、薄弱层层间位移突出的特点;金属阻尼器能提供较大刚度,耗散地震能量,但不能减小顶点位移;黏滞阻尼器能提供较大刚度,耗散地震能力,减少顶点位移,可替换性较高,能满足实际工程抗震加固需求。

The effect of the frame-rocking wall structure is remarkable in the seismic strengthening of the project.But the joint domain of the rigid rod connecting the rocking wall and the frame structure has high requirements,and the rigid rod is easy to be damaged and has low replaceability under rare earthquake.Therefore,it is necessary to find a member that can replace a rigid rod as a connecting member.In order to study the seismic performance of the frame-rocking wall with damper as the connecting member under the rare earthquake,this paper takes a teaching building of a middle school in a certain area as the research object.By using the software SNAP,the model of frame-rocking wall with viscoelastic damper,metal damper and viscous damper instead of rigid rod connection is established,and the influence of connection on frame-rocking wall structure under rare earthquake is analyzed and compared.The results show that the damper can effectively control the deformation between layers without changing the mechanism of traditional rocking wall.Compared with the rigid rod,the viscoelastic damper,as the connecting component between the main structure and the rocking wall,has the characteristics of small axial force transfer and large displacement between the weak layers.The metal damper can provide larger stiffness and dissipate seismic energy,but it cannot reduce the displacement of the vertex.Through comparison,it is found that the viscous damper can not only provide large stiffness and dissipate seismic capacity,but also reduce the displacement of the vertex,and even has high replaceability,which can meet the needs of the actual engineering seismic reinforcement.