Analysis Of The Influence Of Low-frequency Characteristics Of Long Period Ground Motion On The Cooperative Work Of SRC Frame-RC Core Tube Hybrid Structure

The seismic damage data of Wenchuan earthquake and East Japan earthquake show that long period earthquake has great damage effect on high-rise building structure.Existing researches mainly focus on the overall structural response analysis under long-period earthquakes,but few reports on the collaborative work effect of SRC frame-RC core wall and other super-high buildings with dual lateral force resistance.The cooperative work of SRC frame-RC core wall and other sub-structures with dual lateral force resistance is the foundation of realizing multi-channel seismic defense lines.Studying the cooperative work performance of this structure under the action of long period ground motion is of great significance to guide the engineering practice and the action mechanism of this kind of ground motion.In this paper,by PERFORM 3D finite element analysis method,focusing on lowfrequency characteristics of long-period ground motion,9 long-period ground motion of SRC frame-RC core wall structures with 4 different periods were selected as research objects to study the characteristics and mechanism of collaborative working response of SRC frame-RC core wall hybrid structures.Main research include:(1)Comparing and analyzing the cooperative working characteristics of SRC frame-RC core wall structures with different periods under the action of 9 long period ground motions in different frequency domains and 3 ordinary ground motions;(2)Study the internal mechanism of SRC frame-RC core tube hybrid structure under the influence of long period ground motion.Analysis method based on EMD to four groups of different natural vibration period of SRC frame-RC core tube hybrid structures of 1440 times of elastic and elastic-plastic time history analysis,studies the long period ground motion control response high-rise hybrid structure to work together in the IMF component,puts forward the concept of main control component.At the same time,from the Angle of the relative cycle means long period ground motion effects of SRC frame-RC core tube of the inner mechanism of the mixed structure to work together.(3)The simple harmonics with different periods were used as the excitation,and four groups of SRC frame-RC core tube mixed structures with different natural vibration periods were used to conduct 160 elastic and elastic-plastic time-history analysis,so as to further analyze the influence of excitation period on the cooperative work of SRC frame-RC core tube structures.On this basis,the dynamic analysis model of SRC frame-RC core tube structure was established by Laplace transform method,combined with Duhamel integral,and MATLAB programming was used to analyze the collaborative performance of the structure under simple harmonic effects,and a comparative analysis with the PERFORM 3D calculation results.