Seismic Performance Analysis Of Steel Frame-Core Tube Hybird Structure In High Intensity Seismic Region

As the core of building structure, structure systems are innovative along with development of materials science, computing and software theory. Steel-concrete hybird structure combines both advantages of reinforced concrete structure and steel structure, have been widely used in high-rise buildings.Currently, most of over200m high-rise buildings in Kunming are steel-concrete hybird structure. Kunming is located at high intensity seismic region, frequent destructive earthquakes. Therefore, we must ensure that the structure has a certain seismic performance, try to reduce or avoid disasters when earthquake comes.Steel frame-core tube hybird structure was applied widely which is belongs to a class of steel-concrete hybird structure.This paper is based on the preliminary design scheme of a constructed project in Kunming.The project uses steel frame-concrete core structure.Study on the seismic performance of hybird structure in high intensity seismic region. The main contents are:1.Proposed the problem of the connection form between steel beams and concrete core tube.Modelling two structure models with hinge connections and partly rigid connections.Modal analysis and reaction spectrum analysis of this models are carried out that dynamic characteristics of the two models are basically the same and the lateral performance of the model with partly rigid connections is better than the model with hinge connections.The former requires a larger member section,and with worse economy,so select the latter.2.Elastic time-history analysis are carried out for contrast analysis result of reaction spectrum analysis. Under frequent earthquake action in high intensity seismic region,the seismic performance of the model with hinge connenctions can meet the requirements.3.Simplified model and consider geometric nonlinearity and material nonlinearity, elasto-plastic time-history analysis and Pushover analysis are carried out for concluding that the Inter-story displacement angle of model can meet the requirements.Coupling Beams and core walls are the main plastic energy dissipation elements.Plastic hinges are found in coupling beams.Stress concentration and tensile yield are found at the core walls of bottom of the model.Steel frames contribute little contribution of seismic perfoemance. The model with hinge connections can meet the seismic performance targets,and have good seismic performance in high intensity seismic region.