Research On Evaluation Method Of Floor Response Spectra Of Seismic Structure Added With Hysteresis Dampers

Non-structural components are an important part of the structural system,which are the basis of providing a variety of architectural functions.Investigation on structural seismic damage in recent major earthquakes show that earthquake damage of non-structural components may lead to high direct economic loss and the loss of architectural functions,which may have negative impact on the operation of urban society.According to reports,the recovery cost of non-structural components in commercial buildings can be as high as 75%-85% of the total construction cost.Non-structural components have become an important part of performance-based seismic design of structures.In this paper,based on the single-degree-of-freedom structure system,a method for directly estimating the floor acceleration response spectrum under ground motion is proposed.The method is based on the direct estimation method proposed previously for the elastic single degree of freedom structure.For the elastic main structure,by studying the dynamics characteristics of structures and the influence of ground motion duration on the floor response spectrum,a floor response spectrum correction estimation method is proposed.This method can significantly improve the prediction accuracy of the original method and can be applied to the multi-degree of freedom structure.For the nonlinear damping structure with additional hysteresis damper,the equivalent linearization formula is used to obtain the floor response spectrum method of the damping structure.The main research contents are as follows:(1)The research status of floor response spectrum and its simplified direct calculation method are introduced.The design research indicators and related specifications of non-structural components are briefly described,which lays a theoretical foundation for the subsequent research and analysis work.(2)Through the numerical analysis,the influence of the main structure period,damping form,the number of vibration modes and the duration of ground motion on the floor response spectrum are studied.The influence of each parameter on the estimation result and the characteristics of the floor response spectrum are obtained.(3)Based on the original direct estimation method,the elastic single degree of freedom structural system is taken as the research object,and the correction coefficient is introduced to improve the prediction accuracy of the original estimation method.Considering the difference between seismic wave and artificial wave,different correction formulas are derived by considering different correction parameters.The vibration mode superposition method considers the contribution of different vibration modes on each floor,and verifies the prediction effect of the method in multi-degree of freedom structure.The results show that the correction method can accurately predict the floor acceleration response spectrum of different floor positions under different ground motions.(4)The hysteretic behavior of hysteretic damper and its structural system is introduced.The influence of the period and damping ratio of viscous damping elastic structure on the floor response spectrum is analyzed.The floor response spectrum estimation method suitable for high viscous damping ratio structure is proposed.The equivalent linearization method is applied to the nonlinear single-degree of freedom structural system with additional hysteresis dampers,and the average equivalent parameter formula is derived.Based on the equivalent linear system,the floor response spectrum estimation method of the damping structure is established.The results show that the method can be applied to the floor response spectrum estimation of the additional hysteretic damper seismic structure.The performance curves of the additional hysteresis damper seismic structure system is used to evaluate the influence of the damper on the acceleration response of non-structural components and the main structure.