【摘要】 以有限元分析软件ANSYS为平台,基于非线性板壳有限元分析理论,对轻型门式刚架中H型钢楔形薄壁梁的相关屈曲性能进行大挠度弹塑性分析。用Shell 18l单元对轻型门式刚架中H型钢楔形薄壁梁进行离散,考虑初始几何缺陷和残余应力的影响,对其进行全过程跟踪分析,从而对其相关屈曲性能进行深入的研究。从荷载-位移曲线、承载力、变形的发展和塑性区的分布等方面入手,对影响相关屈曲性能的因素(腹板高厚比、翼缘宽厚比、跨度、楔率等)进行系统的分析和研究,并与现行规范进行比较,得到一些有价值的结论。更多还原

【Abstract】 Based on the finite element method,the interactive buckling of tapered H-section steel beams used in portal frame structures are analyzed by ANSYS,in which geometric and material non-linearity are considered.The H-section tapered beams with thin web are dispersed by Shell 181 element and analyzed considering the geometric initial imperfection and the residual stress in the whole course.According to the load-deflection curves obtained,ultimate load-carrying capacity,deformation and the area of plasticity etc,the geometric parameters are analyzed systematically,which include web width-thickness ratio,flange width-thickness ratio,span and web tapering ratio etc.The interactive buckling of tapered H-section steel beams is discussed.By comparing the results obtained from the method with those of current Chinese technical specification,some valuable conclusions are drawn.更多还原