冷弯薄壁型钢抗风墙柱中美设计方法对比  

Comparison of Chinese and American design methods for wind-resistant wall and column of cold-formed thin wall steel

作　　者：张琪 吴前昌 宋拓[1] 赵苗杰 Zhang Qi;Wu Qianchang;Song Tuo;Zhao Miaojie(College of Civil Science and Engineering,Yangzhou University,Yangzhou 225127,Jiangsu;Jiangsu Huwu Construction Group Co.,Ltd,Yangzhou 225127,Jiangsu)

机构地区：[1]扬州大学建筑科学与工程学院,江苏扬州225127 [2]江苏省沪武建设集团有限公司,江苏扬州225127

出　　处：《工程建设》2018年第10期14-20,共7页Engineering Construction

摘　　要：在冷弯薄壁型钢抗风墙柱设计时,由于中美规范的计算方法及参数取值存在差异,抗风墙的龙骨在风荷载作用下的计算长度也有所不同。选用薄壁和厚壁两种型钢进行对比,将抗风柱视为简支梁,两端铰接进行计算,其他参数不变。首先分析出风荷载作用下型钢的有效截面特征,然后由截面特征及风荷载来计算出其在强度计算限值、腹板屈曲限制和挠度限值条件下的计算长度。通过对比发现,中美规范冷弯薄壁型钢的计算长度在强度计算和腹板屈曲限值条件下有较大差异,前者相差最大为59. 6%,后者相差最大为86. 2%;在挠度限值的条件下并没有多大差异,两种规范下相差最大为0. 01%。结合公式和数据的分析,中国规范较为保守,而美国规范较为经济。In the design of cold-formed thin-wall steel wind-resistant wall columns, due to the difference in the calculation methods and parameter selection of the Sino-US specifications, the calculated length of the keel of the wind-resistant wall under wind load is also different. In this paper, the thin-wall and thick-wall steels are used for comparison. The wind-resistant column is regarded as the simple-supported beam, and the two ends are hinged for calculation, while the other parameters are unchanged. Firstly, the effective section characteristics of the section steel under wind load are analyzed. Then, the section characteristics and wind load are used to calculate the calculation length under the conditions of strength calculation limit, web buckling limit and deflection limit. By comparison, it is found that the calculated length of cold-formed thin-wall steel is greatly different between Chinese and American specifications under the conditions of strength calculation and web buckling limit. The former has a maximum difference of 59. 6%, and the latter has a maximum difference of 86. 2%. Under the condition of deflection limit, there is not much difference. The difference between the two specifications is 0. 01% at most. In combination with the analysis of formulas and data, Chinese specifications are more conservative, while American specifications are more economic.

关 键 词：冷弯薄壁型钢 抗风柱 有效截面 计算长度 规范 

分 类 号：TU392.1[建筑科学—结构工程]