Study On Seismic Performance Of The Transfinite Prestressed Slab-Column-Core Tube Structure

With the development of social economy,the acceleration of urbanization,land area is shrinking,high-rise buildings into people’s horizons.High-rise buildings in the effective use of architectural space at the same time,also toward the direction of “higher,more complex”.Because these tall buildings in some aspects is beyond the specification limit overrun standards,according to the specification of such structure need special transfinite technical review.Limited to the seismic analysis of current technical level,it is difficult to the degree of reliability of transfinite structure are defined,especially in seismic performance has-the obvious difference of two kinds of structure of transfinite structure,its seismic performance is still an open question.In this paper,based on the performance of seismic design idea as a starting point,aiming at the shortcoming of the current seismic design method,to a transfinite prestressed slab-column-core tube structure,the seismic performance of whole research,the main research work is as follows:This paper briefly introduces the features of high-rise buildings and development of prestressed slab-column,the characteristics of the core tube structure,and the research status.According to the seismic fortification target classifying seismic performance target,introduces the response spectrum method,the static pushover analysis method and elastic-plastic time history analysis method three methods of seismic response analysis.Using finite element analysis software MIDAS/GEN space structure model is established,the overrun the type of the structure under discrimination,considering factors such as safety,economy and performance specification set the engineering in small earthquakes elasticity,elastic,do not yield and strong earthquakes in fall when seismic fortification of quantitative performance goal.Structure for small earthquakes elastic response spectrum analysis to evaluate the arrangement of the structure and the torsion effect,the supplement of the elastic time history analysis,comparing with the results and the response spectrum analysis to determine the structure can meet the performance targets under small earthquakes.By capacity spectrum method under different loading modes of structure and strong earthquakes in the nonlinear pushover analysis,through the observation of the structure of the stiffness degradation process,find out the weak position of the structure,inspection structure can meet the first in this paper,we set the elastic,do not yield and strong earthquakes in seismic performance targets and to structure the strengthening of the performance of a seasonable suggestion.Finally through the elastic-plastic time history analysis of structure seismic performance,this article compare two results verify the rationality of the pushover analysis.This article in the current research results on the basis of actual engineering has carried on the comprehensive analysis of the seismic performance,satisfactory results were obtained,and the performance based seismic design has a certain reference value and guiding significance.