Research On The Seismic Response Analysis Of Structures With Base Friction Sliding Isolation

The severe damage attributed to strong earthquake indicate that the active seismic codes is lack in principle and is inadequate in adapting social demands. As a result, seismic isolation technique is used broadly. Although some research productions have been obtained in seismic isolation aspects recently, It is difficult to apply the technique to the practice engineering because its fault. Among much seismic isolation technique, sliding seismic isolation technique has perfect isolation effects, on which little research are carried out. In the paper, the siding seismic isolation technique are studied deeply, which are important and valuable in theory aspect and practice engineering.In the paper, the condition in studying seismic isolation is introduced and the principle, composition and method of seismic isolation are analyzed. Based the demonstration of principal in the base sliding seismic isolation, many seismic isolation elements' constitutional relationship are studied and the method is put forward in solving seismic response of seismic isolation structures by means of 3-D Basis procedure. In this way several friction sliding seismic isolation structures are solved which subjected to different earthquake waves, conclusions can be obtained that it serve good isolation effects when the seismic isolation structures have little friction factor. But pure friction sliding isolation have shortcoming of large displacement and remains deformation. In the paper the composite seismic isolation are applied to the structures with friction bearings and rubber bearings Then the composite seismic structures' response are analyzed. Conclusions can be obtained that compound seismic isolation can afford perfect effects than pure friction sliding seismic isolation do. To calculate the effects of composite seismic isolation, the friction force in the friction bearings are compared to the yielding force in the rubber bearings, the ratio is called compositefactor After summarizing many factors of different composite seismic isolation structures, the best factor value lie in the scope of [0.4 l]when the isolation effects is better.