Experimental Analysis on Behavior of Cold formed Steel Box Built up Section Columns under Axial Compression
NIE Shaofeng,ZHOU Tianhua,YUAN Taotao,GAO Tingting and WU Hanheng
DOI:10.11835/j.issn.1674-4764.2012.04.008
Received ,Revised , Accepted , Available online July 01, 2015
Volume ,2012,Pages 46-52
- Abstract
17 specimens of cold formed steel box built up setion columns were tested under axial compression load. The section forms were divided into two categories: A and B. Load displacement curves and failure characteristics of specimens were obtained. The test results are compared with the caculated results according to “effective ratio of width to thickness” in code of “Technical code of cold formed thin wall steel structures” (GB 50018－2002), “effective section method” and “direct strength method” in AISI specification. The results show that: the failure characteristics of LC and MC series columns are overall flexural buckling, while SC series columns are local buckling and ends confined damage. The ultimate bearing capacity of B categories section columns is three times as great as that of A categories section columns, so it has the effect of “1+1＞2”. The results calculated according to “GB50018” and AISI specification are much conservative for LC series columns of A categories section, while in agreement with test results for MC and SC series columns. For B categories section columns, the calculated results are non conservative for LC and MC series columns, while conservative for SC series columns.