The Research Of Seismic Action Of The Upper Mixed Structure And The Earthquake Ground Motion Input Adjustment Based On Wavelet

It has well-positioned performance for the concrete-filled steel tube structure applied to the high-rise buildings,but its overall coordination forces and deformation properties are complex in the seismic action,and it is difficult to predict the weak links of the structure and the destruction state.In this paper,we take a stiffness-irregular steel-concrete column-eccentric shear wall cylinder structural engineering as the background,analysis earthquake-resistant performance,which are to explore the structure force and the deformation performance.We do some studies for the structure from the following aspects based on conventional analysis methods and the wavelet analysis method of the adjusted earthquake motion.The main content include:(1)First,in accordance with the concrete filled steel tube unified theory and anti-seismic the theory of the structure,we stablish the finite element analysis model of the high-rise concrete-filled steel tubular structure to do modal analysis,analysis the impact of high-order vibration mode to the structure and study the overall coordination performance of the structure.(2)Second,we analysis response spectrum of the upper mixed structure in one-way and two-way who has stiffness eccentricity and elastic seismic response of the structure under inputing the earthquake motion,and study the structure force and the deformation performance under the regular earthquake loading,the structure can ensure the request that "small earthquake" is not bad,which make preparation for the comparison that the the wavelet analysis method and the results of the analysis for adjusted earthquake motion.(3)Third,we put forward a new proposal to the problem that it is difficult to guide the design for seismic waves in the wave of the selected control indicators of the structure in the temporal analysis of the high-rise buildings,and adjust it through the way of wavelet analysis which give more comprehensive consideration to site classification,duration, frequency and the impact of the amplitude to earthquake motion.We can input earthquake motion on the base of the wavelet analysis approach of the adjusted seismic waves, understand its impact to response of the structure in the normal conditions,which we compare to the actual seismic wave,and make the base shear as the control indicator in the flexible temporal analysis.We do comparative analysis from the way of the top floor displacement,basement moment,story drift angle,temporal curve of the top floor displacement and the base shear,and get the results that it is closer to the numerical calculated in the response spectrum method for the adjusted seismic waves regularly. According to the existing seismic theory of the structure,its calculation method more fully embodies the characteristics of the design earthquake motion,and its result can reflect the superior performance of the adjusted earthquake motion.(4)At last,we do the temporal analysis on the structure under the rare earthquake in accordance with the bilinear hysteretic model of the simplified concrete filled steel tube, trace the whole process of the structure response under under the earthquake, understanding the weak floor and its destruction state of the structure and it can ensure the request that "earthquake" will not be brought down.Comparing it with seismic waves adjusted from the base shear in the rare event of an earthquake,we find that the last one has smaller discrete.From the results of the elastic temporal analysis,we see the results are consistent and it is better to meet the needs of the characteristics of the inputing seismic waves in the temporal analysis,which provide a new method for the elected waves of the earthquake motion,and offer new ideas for structural design.