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该文对一榀单跨双层钢框架-支撑结构进行了静力试验,重点研究了初始几何缺陷对结构变形性能的影响,由试验结果与有限元分析结果对比吻合较好,证明了考虑随机初始缺陷有限元模型的正确性。采用有限元ANSYS软件对三跨三十二层钢框架-支撑结构的随机缺陷模型进行全过程高等分析,采用蒙特卡罗法拉丁超立方抽样的技术模拟了框架随机初始缺陷的分布情况,并对比多种国内外规范多种考虑初始缺陷的方法,重点研究了结构和构件的变形性能。结果表明:考虑随机初始几何缺陷的框架变形与无缺陷理想框架的柱顶侧移相差不大,在高层结构的高等分析中可不考虑。此外规范中假想力框架变形远远超出随机缺陷框架,可知假想力计算方法过分夸大了初始几何缺陷的不利作用。
In this paper, a static test of a single-span, single-span, double-deck steel frame-support structure is carried out. The influence of initial geometric imperfections on the deformation performance of the structure is studied. The experimental results are in good agreement with the finite element analysis results. Correctness of finite element model of initial defect. The finite element ANSYS software was used to analyze the whole process of the random defects model of the three-span and 32-story steel frame-support structure. The Monte Carlo method of Latin Hypercube sampling was used to simulate the distribution of random initial defects in the frame. A variety of domestic and international norms to consider a variety of initial defects of the method, focusing on the structure and the deformation properties of components. The results show that the frame deformation considering random initial geometric imperfections is not different from that of the ideal frame without defect, and can not be considered in the advanced analysis of high-rise structures. In addition, the frame of hypothetical force in the code goes far beyond the framework of random defects. It can be seen that the method of calculating imaginary force excessively exaggerates the adverse effects of initial geometric defects.