Analysis Of Seismic Performance Of High-rise Structural Reinforcement In Shen Zhen

In recent years,with the rapid development of China’s economy,urban population is also developing rapidly.In this case,in order to improve the utilization rate of land,high-rise buildings have been greatly developed.China is an earthquake prone country.The heavy casualties and property losses caused by previous strong earthquakes put forward higher requirements for the design and construction of building structures.Therefore,in view of the lack of seismic capacity of a high-rise shopping mall in Shenzhen,in order to meet the design requirements of building seismic code,this paper adopts energy dissipation and vibration reduction technology to strengthen the structure,and carries out elastic and elastic-plastic time history analysis on the selected seismic reinforcement scheme based on the finite element software,which proves the effectiveness and rationality of the seismic performance design scheme and reduces the main structural damage.The main work and achievements are as follows:Firstly,this paper introduces the engineering background of a high-rise shopping mall in Shenzhen,the design basis and objectives of seismic reinforcement,summarizes the methods and steps of seismic reinforcement design,and introduces the seismic performance and characteristic of energy dissipation damper in detail.Finally,the metal damper is selected.At the same time,the installation of damper needs support system and how to enclosure it is also introduced.Then,based on the selected layout scheme of metal damper,SAP2000 is used to analyze the elastic time history of the structure with the damper.The effectiveness of the damping scheme is verified by the dynamic response of the structure.Through the analysis of the hysteretic curves of the dampers in the middle and top of the structure,the results show that the damping design scheme meets the requirement that the damper ratio is prior to the structural yield to dissipate the structural energy.Thirdly,the elastic-plastic time history analysis of the structure is carried out based on SAP2000,and the vibration damping effect of each dynamic response and the moment angle curve of the connecting beam element before and after the shock absorption are analyzed.The results show that the effectiveness of the damping scheme is verified,and the plastic deformation of the connecting beam is controlled after the shock absorption.Under the action of horizontal earthquake load with rare eight degree,the design standard of "large earthquake can not fall" can be reached.Moreover,the damper will yield completely under rare earthquake and enter the elastic-plastic energy consumption state,which provides additional damping for the structure and dissipates a lot of seismic input energy.Finally,a representative finite element model of structural members is established based on SAP2000.The influence of additional bending moment on the connected beam is analyzed.Based on SAP2000 finite element model,shell element is used to simulate the actual additional steel plate wall,and the influence of steel plate additional wall on the transfer beam before and after damper is compared.The results show that the connection mode is flexible,and has little influence on the main structure function,the connecting members and structures are in safe state,and the influence of steel plate additional wall on the transfer beam is very small.