Seismic Response Of Double-layer Spherical Lattice Shells With The Modified Triple Friction Pendulum Bearing

The great destructive power of earthquake can bring the loss of human life and property directly, and the secondary disaster caused by the earthquake can bring more direct damage than the earthquake itself. The emergence of the seismic isolation technology has changed the situation, seismic isolation technology is a new kind of anti-seismic method, it uses a device to separate the structure from the base to change the lateral stiffness of structure and extend the natural vibration period of structure, so the structure can effectively avoid the earthquake predominant period and reduce the seismic response.The technology of friction sliding seismic isolation is to set glide layer between the structure and the base. By using the glide layer, the superstructure and foundation are decoupled, and the sliding friction force can provide constraints of horizontal directions to the structure. When the earthquake intensity reaches a certain degree, the seismic action of the glide layer is larger than friction, sliding surface plays a role of seismic isolation through sliding consume the earthquake energy and prevent earthquake energy transfer to the upper structure. So the upper structure internal force is not increased with earthquake intensity increasing.The modified triple friction pendulum isolation bearing is a new type of sliding seismic isolation bearing, which is obtained by installing four viscous dampers in the four corners of the traditional triple friction pendulum bearing. The seismic isolation bearing is used in the double-layer spherical reticulated shell structure, and the three kinds of different bearing shell model of the fixed hinge bearing, the traditional triple friction pendulum isolation bearing and the modified triple friction pendulum isolation bearing are analyzed. Through modal analysis, the structural natural vibration period was obtained; by seismic response analysis, the displacement time-history curve of the axial force of the members, nodal acceleration, counter-force of the column base and displacement of isolation bearing were obtained. The results showed that compared with common structure, the seismic response of seismic isolation structure with modified triple friction pendulum bearing was reduced significantly; and compared with structure with traditional tripe pendulum bearing, the axial force of the pole and nodal acceleration increased slightly, but it can effectively reduce the sliding displacement of the bearing and overcome the disadvantage that the friction pendulum bearing is greatly restricted in the use of the building due to the sliding displacement and the eccentric compression of the lower columns was improved. The damper also causes the tension between the upper structure and the column, so that the axial force of the column is reduced, further shows that the bearing has uplift resistance, and meets the requirements of the pull and pressure type structure.Based on the above analysis, the application of the modified triple friction pendulum isolation bearing in double layer spherical reticulated shell is summarized, which can be used to guide the design of the modified triple friction pendulum isolation bearing in the double-layer spherical reticulated shell.