Research On Seismic Performance Of Frame Structure By Integrated Design Of Shock Absorption And Isolation

The combined technology of base isolation and energy dissipation is a new type of seismic reduction and isolation technology,which is based on the mechanical properties of isolation bearings and energy dissipation dampers,reasonably arrange isolation bearings and energy dissipation dampers in the structure,and realize the seismic performance goal of the structure.At present,there is still a gap between the application level of vibration reduction and isolation technology in China and the first level in the world.The application of vibration reduction and isolation technology in China is mainly based on the separate use of vibration reduction technology or isolation technology,and there is a lack of development and innovation of vibration reduction and isolation technology.This thesis discusses the feasibility of the joint design of viscous damper damping and lead rubber bearing isolation,studies the role of this scheme under different level earthquakes,and reveals the mechanical performance characteristics and differences of different types of vibration reduction and isolation devices under different vibration reduction and isolation measures.Taking the practical project of a factory building of a company in Ding'an County,Hainan Province as the research carrier,based on the current code,the structural seismic analysis is carried out by using the structural software yingjianke and the finite element software ETABS.Among the damping devices,viscous dampers are the most widely used at present,and lead rubber bearings and natural rubber bearings are the most widely used isolation devices.The four models established are the uncontrolled measures of traditional earthquake resistance,the damping measures of viscous damper,the isolation measures of isolation bearing and the hybrid measures of joint design of viscous damper and isolation bearing.In order to make the analysis results have comparative significance,the seismic reduction and isolation design schemes of each measure are determined respectively,After reasonable structural optimization,the four models adopt the same section size and reinforcement.The elastic analysis under small earthquake and the elastic-plastic analysis under large earthquake are carried out.The floor lateral displacement,inter story displacement angle and inter story shear force of the four models are compared and analyzed under the elastic and plastic states of small earthquake and large earthquake respectively.The seismic reduction and isolation effects and laws under different schemes are compared.The influencing factors and seismic effects of viscous damper damping and lead rubber bearing isolation are studied.The damping efficiency of the seismic reduction and isolation combination and the seismic performance of the structure under rare earthquake are analyzed to prove the effectiveness of the seismic reduction and isolation combination technology.The analysis results show that the joint design measures of viscous damper damping and foundation isolation support can work together and give full play to their respective characteristics.The seismic performance of the structure meets the requirements of the code,has a certain safety reserve and shows a good energy dissipation mechanism.Based on the efficient coordination of the integration of vibration reduction and isolation,an optimization method for the design process of the integration of vibration reduction and isolation is proposed.After the design of vibration reduction and isolation meets the design objectives,the section of structural members can be optimized to reduce the dead weight of the structure,reduce the cost and improve the service space.Compared with the general design scheme,the optimization scheme controls the variables of vibration reduction measures,Just check whether the isolation measures meet the structural optimization objectives.To a certain extent,it avoids the blindness of repeated checking and modification of conventional design,and greatly improves the efficiency of design.This method has clear thinking,direct process and no redundant repeated process.It meets the requirements of seismic reduction and isolation design while taking into account the smoothness of design,and is more economical,practical and space saving.The design method has certain popularization and application value,in order to provide reference for the structural design of similar projects.