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考虑材料非线性,采用ANSYS程序建立变截面门式刚架动力特性的数值模拟分析模型.通过对不同跨度和柱长细比的变截面门式刚架的动力特性分析表明,变截面门式刚架结构的滞回曲线比较饱满,呈梭形,具有良好的塑性变形能力和滞回耗能能力.变截面门式刚架在低周反复循环荷载作用下发生了刚度与强度的退化,且程度不断加大.门式刚架结构的延性随着跨度或柱长细比的增大而降低;当跨度大于42 m和柱长细比大于90后,门式刚架的刚度和强度退化速率加快,结构的延性迅速降低.变截面门式刚架的正负向荷载及相应的位移并不完全对称,表现出鲍辛格效应.
Considering the material nonlinearity, the numerical simulation analysis model of the dynamic characteristics of the variable cross-section portal frame is established by ANSYS program.Analysis of the dynamic characteristics of the variable cross-section portal frame with different span and column slenderness shows that, The hysteresis curve of the frame structure is quite full and fusiform, and has good plastic deformation ability and hysteresis energy dissipation ability. The rigidity and strength degeneration of the variable cross-section portal frame under cyclic loading under low cycle, The ductility of portal frame decreases with the increase of span or column slenderness ratio. When the span is greater than 42 m and the slenderness ratio of column is greater than 90, the stiffness and strength degradation of portal frame are accelerated , The ductility of the structure is rapidly reduced.The positive and negative loads and corresponding displacements of the variable cross-section portal frame are not completely symmetrical and show the Bauschinger effect.