Research On The Seismic Dissipation Of Two-tower-connected High-rise Building With Enlarged Base

Two-tower-connected high-rise building with enlarged base is a new style of structure,also a kind of complex structure system.Due to the existence of the galleries,this kind of structure have a strong spatial coupling effect,which makes it's dynamic behaviors and failure mechanism different from ordinary single-tower high-rise building.So,it's seismic design becomes a difficult problem at the moment.In order to explore effective solutions of this problem, firstly the static & dynamic behaviors of two-tower-connected high-rise building with enlarged base are discussed,and then it's failure features are studied,at last seismic energy dissipation technology is introduced to control the structure's response.The main points of this thesis are as follows:①In this paper, the engineering application, research status and seismic failure features about two-tower-connected high-rise building with enlarged base are systematically represented,then the application and research progress of seismic control techniques in this kind of structure further are introduced.②Problems related to structure controlling with viscous dampers are explored:mainly include damper's restoring force model,the influence of damper on the structure,The installation mode of damper,the support design and determination methods of damper parameters.③Two examples,biaxial axial symmetric and single axial symmetric two-tower-connected high-rise buildings with enlarged base are constructed respectively,to take measures to absorb shock according to the structure stress and deformation characteristics,and then makes 3-d finite element analysis by SAP2000.This paper discusses the impact on its dynamic characteristics from the dynamic properties and measures of these two kinds of two-tower-connected high-rise buildings.④Seismic response analysis of biaxial axial symmetric and single axial symmetric two-tower-connected high-rise buildings with enlarged base and corresponding seismic mitigation structure is analyzed by mode analysis method,discusses the different earthquake input due to the this two kinds of structures,and analyzes two ends of the connected structures with different connecting methods due to the structure in seismic resistance.⑤Parametric analysis (optimization) of the viscous damper's damping coefficient which belong to biaxial axial symmetric and single axial symmetric two-tower-connected high-rise buildings with enlarged base is carried out,and selects out optimal damping coefficient.On this basis, this paper use time history analysis to analyze the frequent earthquakes action before and after seismic mitigation,researches the effect of shock absorption by using viscous damper.⑥This paper researches the theory of static elastic-plastic analysis and its implementation method,explores the method to calculate equivalent damping ratios for shock absorption structure.On this basis, Pushover analysis for biaxial axial symmetric and single axial symmetric two-tower-connected high-rise buildings with enlarged base is carried out,the distribution of plastic hinges and deformation ability by using viscous damping bracing in connected structures under a big earthquake of X orientation.