【摘要】 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.更多还原

【Abstract】 A dynamic numerical simulation model of a tapered portal frames considering the nonlinearity of the materials,established by ANSYS program.Dynamic modes analysis of tapered portal frames with different spans and slenderness ratio shows: the tapered portal steel frames own shuttle-shaped plump hysteretic curves with good energy dissipation and good plastic deformation.The rigidity and strength of the tapered portal steel frame degrade increasingly under the low cyclic loading.The ductility of the tapered portal steel frames reduces evidently with increasing spans or column slenderness ratios;when the span is larger than 42 m and the slenderness ratio is greater than 90,the degradation of the stiffness and strength of the portal frame accelerates,and ductility of the structure decreases rapidly.Under the forward and reverse loading on the frames,the corresponding displacements are not entirely symmetrical,appearing the Bauschinger’s effects.更多还原