| Semi-rigid connections of steel frame can absorb more seismic energy and can resist earthquake load. They have the ability to resist earthquake. In traditional structure analysis, the behavior of beam-to-column is treated as either pinned or rigid joints entirely. Pinned joints means no moment could be transferred from beam to column, so rotations of beam and column are independent each other. Rigid joints means included angle between beam and column holds the line after the frame transfigured with loads. These idealized assumptions predigest the analysis and design of steel frame, but they could induce insecurity or conservative design for semi-rigid steel frame. In this paper, according to the theory of small-transfiguration and elastic second-order analysis and the traditional theory of beam-column, a program is designed to analyze a steel frame, which has top and seat angles with double web angles semi-rigid connection, by using MatLab. In this program, the effect of semi-rigid connection and the effect of P-Δis considered. By use of the program, we calculate the transfiguration and the internal force of a semi-rigid steel frame under horizontal loads and we take an experiment on the structure model of this frame. The results of calculation and experiment are contrasted in the paper. |
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