Design Of Nested Flexible Bearings Of Corridor Structure And Analysis Of Damping

With the adjustment of my country’s industrial structure,the setting of urban corridors has emerged in large numbers in the construction of basic cities as architectural shapes that meet the use of functions and landmarks.Independent buildings with different use functions are connected together,which has promoted the development of various industrial chains.Organic integration and scale effect have extremely high commercial value.This paper aims at the application research and related specifications of the existing seismic isolation damping bearings,considering the problems in the design and use of the corridor nodes and the reasons for the corridor accidents,and designs a new type of nested flexibility based on the corridor structure The damping bearing has important practical significance for studying the safety of the corridor structure and the feasibility of node application.This paper studies the damping performance of the nested flexible support from three aspects: theoretical analysis,experimental research and finite element simulation of the nested flexible support.The main tasks are as follows:1.A theoretical analysis of the shape design,connection technology,and energy consumption mechanism of the nested flexible damping bearing is carried out.The characteristics of the main component materials constituting the nested flexible damping bearing are analyzed.Based on the actual test conditions and theoretical analysis,the test support is simplified and the key parameters of the test support components are analyzed and designed.2.Through experimental research,the shock absorption performance of the nested flexible support under different conditions of vertical bearing capacity,shear deformation,acting load and frequency change is analyzed.conclusion as below:(1)The nested flexible support has good bearing capacity,and the vertical deformation is 4% of the thickness of the double shear layer in the test.(2)With the increase in the number of shear layers of the nested flexible support,the horizontal equivalent stiffness will increase greatly under the same loading amplitude,which has a greater impact on the energy consumption effect of the nested flexible support;and the counter-bolt The annular misalignment angle is reduced,which improves the stability of the nested flexible support.(3)With the increase of the vertical load,the horizontal force and horizontal equivalent stiffness of the nested flexible damping support are increased.It is believed that within the allowable range of PTFE vertical deformation,increasing the vertical load can improve the shock absorption performance of the bearing.(4)Considering the impact of objective factors such as the slip phenomenon between the ring-shaped laminated rubber steel plates during the test,the monitoring error,and the damage accumulation of the same specimen during the test,it is considered that the loading period has an impact on the shock absorption performance of the nested flexible support The impact is negligible.3.Through the finite element simulation,the shock absorption performance of the nested flexible support is analyzed for three parameter variables: the ratio of the thickness of the shear layer material,the number of the shear layer and the ratio of the number of the shear layer material of the 13 groups of nested flexible bearing specimens.conclusion as below:(1)As the shear layer material thickness ratio ω decreases,the change in unit energy consumption first increases and then decreases,and the equivalent damping ratio first decreases and then increases.It is recommended that the shear layer material thickness ratioω takes 1.0～2.5 as should.(2)Increasing the number of shear layers of the support can effectively improve the shock absorption,energy consumption and comfort of the nested flexible support.It is recommended that the number of shear layers of the nested flexible support is not less than4.(3)As the ratio θ of the shear layer material of the nested flexible bearing decreases,the horizontal equivalent stiffness and equivalent damping ratio first increase and then decrease.It is recommended that the single shear layer material layer of the nested flexible bearing The appropriate ratio is 1.20<θ≤1.5.