Mechanical And Seismic Performance Analysis Of One-piece Structures Of High-rise Buildings

As a new type of structure,conjoined structure has been frequently used in high-rise buildings,especially landmark buildings,because of its unique momentum and characteristics.Because of the existence of the connector,the independent tower and the connector in the connected structure form a whole,which strengthens the spatial connection of the tower and makes the dynamic characteristics and the response of the structure under the earthquake more complex,It is of great theoretical and practical significance to discuss the performance-based seismic design method of this kind of structure.In this thesis,an actual high-rise building connected structure project is taken as the research object,the seismic response of connected structure with different connection modes is analyzed,and the influence of different connection modes between connecting body and tower on the whole structure,tower and connecting body is discussed.The main research work and achievements are as follows1.This thesis summarizes and analyzes the application and development status of connector structure at home and abroad,as well as the types and characteristics of common connection methods.This thesis introduces the basic situation of the connected structure scheme of a high-rise building based on the research and analysis of this thesis,as well as the types and performance characteristics of the isolation bearings and dampers used.2.Based on the connected structure scheme of a real high-rise building,the mode decomposition response spectrum method is used to calculate the structural system with no connection,rigid connection and flexible connection under frequent earthquakes.The overall dynamic characteristics and seismic response analysis results of the three structural systems are compared and analyzed.The results show that both the rigid connection scheme and the flexible connection scheme significantly affect the natural vibration period of the whole structure;The influence of rigid connection scheme on the stress and deformation of each tower structure is more obvious than that of flexible connection scheme;The story shear and story displacement angle of the tower with rigid connection are larger than those with flexible connection,but the top displacement of the tower with rigid connection is smaller than that of the tower with flexible connection.3.On the basis of the above analysis,the elastic time history analysis of rigid connection structure system and flexible connection structure system under frequent earthquakes is carried out,and the elastic time history analysis results of the two connection structure systems under the same seismic wave are compared,and the results are compared with the calculation results of mode decomposition response spectrum method.The results of elastic time history analysis show that the floor shear force of the tower with flexible connection scheme is significantly less than that of the tower with rigid connection scheme,and there is a large mutation in the floor shear force at the connection of the tower with rigid connection scheme;The story drift angle of rigid connection tower is larger than that of flexible connection tower,and the story drift angle of rigid connection tower is close to the limit value required by the code,showing obvious mutation at the connection.The calculation and analysis of the flexible connection scheme connector under the frequent earthquake and wind load are carried out,and the performance of the isolation bearing and the working state of the damper are discussed.4.The dynamic elasto-plastic analysis of the flexible connection structure system under rare earthquake is carried out,and the stress and deformation characteristics,plastic development law and damage characteristics of the connecting tower and the connecting body are analyzed;In this thesis,the seismic response of the bearing with and without dampers is calculated and analyzed under the rare earthquake.The hysteretic characteristics of the bearing under the two conditions are compared.The results show that the shear deformation of the bearing with and without dampers is significantly reduced,The results show that the viscous damper can play a better role in damping and energy dissipation under rare earthquake.