Research And Application Of Composite Isolation For Seismic Performance Of Frame Structure

In the high intensity area,the isolation structure has better seismic performance than the traditional seismic structure.The reinforced concrete frame structure can provide a large space for use,which has been widely used in the multi-storey houses in China.The application of isolation support to reinforced concrete frame structure has extensive application and long-term significance.Compared with a single isolation support,the composite isolation structure with lead rubber bearing and friction sliding support can complement each other and achieve better isolation effect.Combined with previous research,this paper mainly completes the following items:(1)At 8 degrees in Sihong,a six-story reinforced concrete frame structure of the office building as the background,according to the mechanical properties of the various isolation bearings,using different connection unit to simulate the traditional bearings,lead rubber isolation bearings,the friction-sliding isolation bearings,establish calculation model under different isolation bearing arrangement,through the modal analysis of the traditional anti-seismic structure model,a single structure model and parallel composite isolation structure model and tandem compound isolation model,comparing the four model to explore various isolation bearing arrangement scheme for periodic changes in the structure of influence.(2)The elastic and plastic analysis of frame structure was carried out by using the mode decomposition reaction spectrum method.Under seismic action,the deformation of the structure mainly occurs in isolation layer,the upper structure basic do overall translational,effectively reduce the horizontal displacement of the upper structure,reducing the structure of interlayer shear effect,consumes most of the energy of the earthquake.Through the analysis of the response spectrum method to traditional anti-seismic structure model,a single structure model and parallel composite isolation structure model and tandem compound isolation model,comparing the four models to explore different layout of the displacement between layers of frame structure.(3)The traditional seismic structure model and various isolation structure models are analyzed respectively.After the simulation experiment,it was found that the interlayer displacement,interlayer shear force and acceleration of the structure with the isolation support were greatly reduced,and the effect of the earthquake resistance was significant.Through nonlinear time history analysis to traditional anti-seismic structure model,a single structure model and parallel composite isolation structure model and tandem compound isolation model,comparing the four model analysis of isolation bearing arrangement scheme for frame structure by interlayer shear force and the influence of maximum interlayer acceleration,vibration isolation effect is the best layout scheme.(4)The influence of different isolation support arrangement schemes on seismic performance of frame structures is studied.The results show that the lead rubber bearing has a large vertical bearing capacity and good recovery performance.Friction sliding support has a larger vertical bearing capacity,but does not have the ability of automatic reset.The parallel composite isolation structure complements the advantages and disadvantages of the two kinds of supports,but some isolation performance is not as good as a single isolated structure.The series composite isolation structure not only complements the advantages and disadvantages of the two kinds of supports,but also has better performance than the single isolation structure.Therefore,it is very important to arrange and choose the isolation mount.