Performance Test And Structural Vibration Control Design Of Steel Spring Isolator

With the improvement of urban traffic network,the problems of earthquake resistance and vibration reduction of buildings along the urban traffic line are becoming increasingly prominent.The problems of vibration isolation and damping of building structures under the influence of vertical urban traffic disturbance and rare horizontal earthquake need to be solved.Steel spring isolator is mainly composed of steel spring vibration isolator and damping tube,which is applied to the structural design near the subway.It can effectively control the structural vibration caused by vertical urban traffic disturbance and horizontal ground motion.The device has been applied in more than 100 critical buildings in the world.At present,in the engineering application of steel spring isolator and damping device,the performance parameters of the device are all taken from the theoretical value,and there are no multi-condition test research and parameter value determination for the vertical and horizontal performance of the device.In addition,due to the lack of systematic analysis on the influence of different parameters of the device on the structure control effect,the checking calculation method is mostly used in the engineering design process to meet the design requirements,which makes the design process lack practicability and optimality,which severely restricts the application of the device.In this paper,the mechanical performance parameters and seismic performance of steel spring vibration isolation and damping tube are analyzed using experimental research.Based on the numerical calculation of the Benchmark building model under the device,the parameter analysis of the vibration control effect under the vertical environment excitation and earthquake influence is carried out.On this basis,a design method suitable for the engineering application of the device is proposed.The paper mainly includes the following parts:(1)In order to determine the mechanical performance parameters of the steel spring vibration isolator,compression shear performance tests and ultimate performance tests of the steel spring vibration isolator are carried out.According to the results of compression shear performance tests,the performance parameters of steel spring vibration isolator under different vertical compression conditions are obtained.According to the result of ultimate performance tests,the yield limit and the boundary condition are determined,the shear resistance of the steel spring vibration isolator is also analyzed,and the optimization suggestions for the steel spring vibration isolator are given.(2)In order to determine the horizontal and vertical mechanical performance parameters and energy dissipation capacity of the damper tube,the vertical and horizontal tests of the damper tube is studied.According to the results,the performance parameters and hysteretic curve of the damper are calculated,the energy dissipation capacity of the damper in the vertical and horizontal directions is analyzed,and the influence of loading amplitude and frequency on the damping coefficient of the damper is determined.(3)In order to study the vibration isolation effect of structure with steel spring isolator under urban traffic disturbance,and the law between the change of device parameters and the strength of the vibration isolation effect,the 20 floors Benchmark model with steel spring isolator is used as the research object,and SAP2000 finite element software is used for numerical simulation to calculate the vibration response of each floor of the model structure under urban traffic disturbance.Comparing the acceleration and vibration acceleration level response of the structure with and without control,the vibration isolation effect and the law of steel spring vibration isolation and damping structure in different stiffness ratio and damping ratio range are analyzed.(4)In order to study the vibration isolation effect of structure with steel spring isolator under horizontal earthquake,and the law between the change of device parameters and the strength of damping effect,the horizontal acceleration,displacement and control effect of each floor of benchmark model structure under the influence of earthquake are simulated.This paper compares the damping effect of steel spring isolator and lead rubber bearings,and analyzes the damping effect and the law of steel spring vibration isolation and damping device structure under different stiffness ratio and damping ratio range.(5)Based on the experimental study and the analysis of numerical simulation parameters,an engineering design method suitable for the steel spring isolator is proposed.According to this design process,the vibration isolation and damping design of a quadrangle project in Beijing are carried out,which shows the design process and verifies the rationality of the design method.The design method can provide reference and guidance for the engineering design of steel spring isolator.