Vulnerability Analysis Of A Super High-rise Building Structure Based On IDA Method

With the rapid development of urban economic construction and architects’ bold and novel innovative design ideas,complex and over-limited building structures are springing up like bamboo shoots after a spring rain,among which the most widely used structural system is the frame-tube structure.In addition,China is a country of frequent earthquakes,once the earthquake comes,causing the collapse of the building structure,the serious consequences are hard to imagine,therefore,it is necessary to analyze and study the seismic vulnerability of such structures.This paper,taking shenzhen BaiTao international engineering design consulting co.,LTD.Design of an engineering project as the background,based on the raised amount dynamic analysis results of the structure under different direction under the action of earthquake vulnerability analysis,investigation in different directions under the action of earthquake damage probability,to build high-rise frame-tube structure to provide some reference for seismic vulnerability assessment system,effectively reduce and avoid to this kind of structure damage caused by the earthquake.The specific research is as follows:(1)The finite element analysis model of ABAQUS was derived from a 41-storey frame-tube structure model established by YJK,and the results of total mass,period and vibration mode of the model were compared with those of YJK,to verify the reasonable feasibility of the model;(2)The seismic wave,seismic demand parameters and seismic intensity parameters were selected,and the incremental dynamic analysis of the tower structure along the four different directions of the seismic action was carried out to obtain the IDA curve clusters with the maximum inter-storey displacement Angle as the seismic demand parameters and the peak acceleration PGA as the seismic intensity parameters;(3)Although there were significant differences between IDA curve clusters from different angles,the overall change pattern was small at the beginning,IDA curve clusters were relatively concentrated,and their dispersion became more and more obvious as they gradually increased.The trend of the curve is different.Some curves have a sudden decline in slope,which is shown as excessive weakness;some curves have a sudden rise in slope,which is shown as excessive reinforcement and other different characteristics;(4)By defining performance levels,and quantitative structure could be divided into no structure damage,mild,moderate damage and serious damage four kinds of damage state,according to the different seismic intensity more than damage status of structural responses under the action of the conditional probability formula of paint a different direction under the action of earthquake vulnerability curve,and comparative analysis curve in different directions;(5)The vulnerability curves of the non-damaged state and the mild damage state are very different from the first four angles,while the vulnerability curves of the moderate damage state and the relatively severe damage state have no difference at the first four angles until the peak acceleration of the earthquake increases to a certain value;(6)The vulnerability matrix under the action of earthquakes in different directions in this project is obtained from the maximum value of the input seismic acceleration corresponding to 7 degrees of frequent earthquakes,fortification earthquakes and rare earthquakes(7)By defining the structure under the condition of a level before the injury occurred after the primary injury of conditional probability to quantify the overall damage degree of high-rise frame tube structure,puts forward the method of diagonal,the resulting structure under different direction seismic action of the overall damage matrix,carries on the comprehensive analysis it is concluded that:under the effect of more severe earthquake,the earthquake in the direction of the influence of structural vulnerability is not large,and in earthquake resistance and under the action of the rarely met earthquake,frame tube structure is obvious in the 30° direction than the other three directions are more prone to injury.