Method Of Seismic Design And Performance Analysis Based On The Displacement Of Concrete Filled Square Steel Tube Frame

With the development of concrete filled steel tubular frame structure has been widely concerned about the seismic design method, which has been studied, and the displacement-based seismic design method is the most energetic method of seismic design in today’s society. Displacement-based seismic design method is simple, convenient operation, more in line with the owners and the demand of the society.Therefore, for concrete filled steel tubular frame structure seismic design method based on displacement has a strong research value, the research work of this paper are as follows:(1) Put forward the inter-story displacement angle as the controlling displacement of frame structure seismic design method based on displacement, inter-story displacement angle can well reflect the deformation of frame structure, can effectively control the seismic performance of frame structure under different earthquake levels.(2) Using the method of equivalent substitution, put the original complex multi-degree-of-freedom system into a single degree of freedom system, which makes the calculation more simple and quick, and proposes to calculate the parameters of single degree of freedom system under the seismic effect analysis of different level of performance under the framework of the lateral mode.(3) Using the pushover analysis method to carry on a pushover analysis of office building on a10layer model, comparing the different on seismic resistance of concrete filled square steel tubular frame structure, concrete filled circular steel tubular frame structure and reinforced concrete structure. Comparison of model to analyze the effects of the thickness of steel tube and concrete strength on the seismic performance and make a summary of the time and the distribution of plastic hinge. Studied different level of performance under lateral curve, inter-story displacement angle and base shear.