【摘要】 为研究柱脚刚接与柱脚铰接柱列支撑体系的不同受力性能,采用蒙特卡罗方法,考虑柱子和水平撑杆初始几何缺陷的随机遇合,应用有限元程序ANSYS对柱脚刚接和柱脚铰接柱列支撑体系进行大量参数仿真分析。研究结果表明:柱脚刚接柱列支撑体系失稳时柱子呈两个半波的变化趋势,柱脚铰接柱列支撑体系失稳时柱子呈三个半波的变化趋势,因而后者的极限承载力和柱中撑杆内力均大于前者,且后者较高的极限承载力更大幅度地增加了柱中撑杆内力;柱子和水平撑杆初始几何缺陷的随机遇合作用导致柱中水平撑杆受压或拉力的随机性,降低了支撑内力,比GB 50017—2003《钢结构设计规范》中柱列支撑设计公式计算的支撑内力小许多。更多还原

【Abstract】 In order to investigate the different mechanical behaviors of column-bracing systems between fixed-end column base and pin-ended column base,a large number column-bracing systems with fixed-end column base and pin-ended column base have been analyzed using ANSYS program,in which random combination of the initial geometric imperfections between columns and braces was considered by the Monte Carlo method.The results indicated that the buckling mode of columns for column-bracing systems with fixed-end column base was two half- waves of bending and the buckling mode of columns for column-bracing systems with pin-ended column base was three half-waves of bending,so that the ultimate load-carrying capacity and the bracing forces of the mid-height horizontal braces of the later were higher than those of the former,and the relative high ultimate load-carrying capacity of the later more significantly increased its bracing forces of the mid-height horizontal braces.The random combination of the initial imperfections between columns and braces led to the randomness of the braces in compression or in tension,so that the design bracing force could be reduced and the above design bracing forces were much smaller than those proposed by the Code for Design of Steel Structures(GB.50017 -2003).更多还原