Research On Dynamic Response Analysis And Optimal Layout Of Multilayer Structures With Friction Pendulum Bearing

Friction pendulum bearing is a kind of isolation bearing with excellent performance,which blocks and weakens the seismic action of wave propagation to the superstructure,making the response of the superstructure significantly smaller than that of the non-isolated structure.It not only protects the superstructure,personnel safety,indoor facilities and instruments,but also does not affect the normal use of buildings.In recent years,the use of isolation technology has become increasingly widespread and mature.This article uses numerical analysis methods to study the impact of FPB support types and different arrangements on the dynamic response of frame structures.A more effective FPB isolation support arrangement scheme for reinforced concrete frame structures is proposed,which not only achieves good seismic performance but also reduces the number of FPB supports used,achieving a more economical isolation effect for building structures.Therefore,this article takes a 7-story reinforced concrete frame structure as an example.Firstly,the dynamic response of an isolated frame structure using friction pendulum bearings and an uninsulated structure is compared to determine the isolation performance of friction pendulum bearings in the frame structure.Secondly,the selection of isolation layers and the influence of relevant parameters of friction pendulum bearings on the seismic response of isolation frame structures are studied,and the influence of different isolation positions and friction pendulum isolation models on the isolation effect of FPB multi-layer frame structures is proposed.Finally,multiple types of FPB isolation bearing combinations were proposed,mainly based on the two parameters of bottom shear value and interlayer displacement angle to evaluate the seismic isolation effect of the isolation structure.The optimization function of the friction pendulum bearing combination scheme was constructed,and the seismic isolation performance of each combination scheme was evaluated.This study shows that the use of friction pendulum bearings in frame structures has good isolation effects,and the frame structure with basic isolation has the best isolation effect.However,interlayer isolation has a certain isolation effect on the frame joints.With the change of the isolation layer,the isolation effect is clearly divided into two situations.When the isolation layer is located near or below 1/2 of the structure height,the isolation effect is better,and when the isolation layer is located above 1/2 of the height,the isolation effect is worse.At the same time,it was found that when using friction pendulum bearings with a higher level of horizontal displacement limit value,the isolation effect of the isolated structure is not significant;According to the vertical axial force borne by the FPB isolation bearings under each frame column,different bearing friction pendulums are selected.The specification with smaller bearing capacity is selected for the side span position,and the mid span position is appropriately enlarged by one or two levels to improve the seismic isolation performance of the structure.