| In this paper, concrete-filled steel tubular column and slab-column structure are combined. This structure can not only play a functional flexibility in the using, but also take advantage of the excellent mechanical properties of the concrete-filled steel tubular column in load-bearing, so it has a wide range of adaptability. However, up to now, the stress mechanism and computing theory of square concrete-filled steel tubular slab-column structure under the horizontal load is still not clear, so that in the engineering application, especially for seismic design, this structure is subject to more constraints. In this paper, with the aid of the large general-purpose finite element software ANSYS, through the theoretical analysis and finite element analysis, the width of the equivalent beam, the lateral resistance stiffness and the elastic dynamic characteristics of the square concrete-filled steel tubular slab-column structures under the horizontal load are systematically studied. The main contents covered are present as follows:(1) The independent node models of square concrete-filled steel tubular slab-column structure in six different sets of geometric parameters are established. According to the principle that the top displacement of the square concrete-filled steel tubular slab-column connection equals to the one of the equivalent beam-column connection, the relationship between the geometric parameters of the computational model and the width of the equivalent beam are analyzed, the reasonable calculating formulas of equivalent beam width coefficient are given by the elastic finite element analysis.(2) In order to verify the anti-side performance improvement of slab-column structure under introducing concrete-filled steel tubular column, the reinforced concrete and square concrete-filled steel tubular slab-column structure in four different sets of geometric dimensions are established. By applying a horizontal force of inertia, the relationship of lateral resistance stiffness between the two kinds of slab-column structure under the same loading and geometric dimensions is drawed. And the main factors that affect the lateral resistance stiffness of slab-column and the law of changing with geometric dimensions are studied.(3) With the engineering examples, the models of full-scale structure and equivalent frame structure for square concrete-filled steel tubular slab-column structures under the same condition are established. For each structure, the modal analysis, spectral dynamical response analysis and elastic dynamical time-history analysis after inputting seismic wave are calculated. The vibration characteristics (frequencies and mode shapes), the maximum floor displacement and maximum story shear force, the time-history acceleration curve, the time-history absolute displacement curve and the time-history story shear force curve of the top and bottom floors are compared among the two kinds of structures. The comparison of the analytical results shows that the analytical model proposed in this thesis is feasible. |
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