【作者】 李强；

【导师】 吴剑国；

【作者基本信息】 浙江工业大学 ， 结构工程， 2009， 硕士

【摘要】 货架近几年来在物流行业中得到了广泛应用,但是我国货架立柱设计的理论还不完善,货架立柱的截面设计仍处于初步阶段。本文首先利用将截面离散的方法计算截面特性,编制了可以精确计算截面特性的程序。然后,依据复合形法和已编制的截面特性计算程序对货架(仿N90系列)立柱进行优化设计。在优化时考虑了两种情况,一种是设置支撑,另一种是未设置支撑。结果表明,优化结果的截面特性比标准截面构件的截面特性有了一定程度的提高。最后,在优化的基础上,利用ANSYS对立柱进行承载力分析。结果表明在相同的条件下,优化后的构件的力学性能优于优化前的截面,同时也验证了优化分析的结果。在考虑初弯曲和初偏心的情况下,新截面构件无削弱时,有限元计算出的稳定系数值与冷弯薄壁型钢结构技术规范中的稳定系数值基本吻合;有截面削弱时,构件的稳定极限承载力减小,下降程度与构件的计算长度有关。在考虑初弯曲的情况下,新截面构件有截面削弱时较无截面削弱时初弯曲的影响程度有一定程度的降低。随着构件高度的增加,构件的初始缺陷主要指的是初弯曲。对于有截面削弱的构件(N90系列货架立柱),依据毛截面的截面特性进行构件的稳定极限承载力计算比较危险,而采用净截面的截面特性较好些。更多还原

【Abstract】 Rack in the logistics industry has been widely applied in recent years. However, the design of section of the rack’s column is still at an elementary stage, there is no perfect theory to support the design of section of the rack’s column.In the paper, first of all, the program calculating the characteristics of the section is proposed by Discrete Method. It can be used to calculate the sectional characteristics accurately.Then, the column of the rack (like N90 series) is optimized based on Complex Method and the program. When optimized, two aspects is considered, one is setting the brace, the other is not. The conclusion shows that: no matter considering the brace or not, the sectional characteristics of the optimized section is better than the standard section.Finally, the ultimate bearing capacity of rack’s column is analyzed by ANSYS, The conclusion shows that the characteristics of the optimized section is better than the standard section. Considering the initial bending and initial eccentricity, when the section is complete, the results calculated by ANSYS agree with the value in Technical Code of Cold-Formed Thin-Wall Steel Structures. When the section is weakened, the ultimate bearing capacity of the column decreased, the decreased degree is related to the effective length of the column. When considering the initial bending lonely, the impact degree of the new complete section is bigger than it of the new weakened section. With the height of the column increased, main initial defect is initial bending. As for the weakened new section (N90 series rack column), looking up the standard based on the complete section’s sectional characteristics is dangerous. The sectional characteristics based on the net section is more accurate and safe than the one based on the complete section.更多还原