High-rise Steel - Concrete Mixed Structure Elastoplastic Time And Energy Response Analysis

At present, the steel-concrete hybrid structure has been widely used in the construction of high-rise buildings in China, a nation with high activity and high-frequency of earthquakes. So the research of antiseismic behavior of steel-concrete hybrid structure is of great significance. In this paper, the elastoplasitic dynamic analysis method and the energy response method are used to research the seismic response of external steel frame and internal concrete core tube mixed structures under earthquake actions. The main contents are as follows.(1) A three-dimensional finite element analysis model of high-rise steel-concrete hybrid structure is established, and its natural vibration characteristic is analyzed.(2) Through the elastoplasitic dynamic analysis of steel-concrete hybrid structure under different earthquake inputs, the displacement-time history response of top floor, acceleration time history, maximal floor displacement and inner-story drifts ratio of the structure are obtained. The character of its crack development, yielding mechanism and failure situation are also discussed in detail. Through comparative analysis of the structure's dynamic response under different earthquake inputs, it is found that the spectral characteristics of the input seismic wave have significant influence on the dynamic response of steel-concrete hybrid structure.(3) By way of energy response analysis of the steel-concrete hybrid structure, this paper discusses the earthquake total input energy of the structure under different ground motion parameters, and the regularity of the total input energy between hysteretic energy and damping energy. Through the research, it is found that the energy responses analysis method is quite effective to reflect the seismic response process and the elastoplastic performance of the steel-concrete hybrid structure under earthquake inputs.(4) Contrasting the different results obtained by elastoplasitic dynamic analysis method and energy response analysis method, it is found that it's not comprehensive to assess the seismic behavior of steel-concrete hybrid structure by unitary displacement index. And the suggestion of supplementing energy analysis in evaluating the seismic behavior of steel-concrete hybrid structure is put forward.