A half open cross section built-up column, namely cold-formed thin-walled steel built-up column with 12-limbsection (CTSBC-12) is put forward. To deeply reveal the mechanical behaviors of CTSBC-12 under axial compression and put forward its calculation formula of axial bearing capacity, based on the previous axial compression experimental research, the finite element analysis (FEA) is conducted on 9 CTSBC-12 specimens, and then the variable parameter analysis is carried out. The results show the FEA is in good agreement with the experimental research, the ultimate bearing capacity error is within 10%. When the slenderness ratio is more than 96.54, the ultimate bearing capacity of CTSBC-12 decreases rapidly, and the failure mode changes from local buckling to global buckling. With the local buckling failure mode unchanged, the ultimate bearing capacity decreases gradually as the ratio of web height to thickness increases. Three methods are used for calculating the ultimate bearing capacity, the direct strength method of AISI S100-2007 gives result of ultimate axial load which is closest to the test and FEA results. But for simplicity and practicality, a simplified axial bearing capacity formula is proposed, which has better calculation accuracy with the slenderness ratio changing from 30 to 100.
Wentao Qiao — 1)School of Civil Engineering, ShiJiazhuang Tiedao University, Shi Jiazhuang, China 2)Key Laboratory of Roads and Railway Engineering Safety Control (Shijiazhuang Tiedao University), Ministry of Education, Shijiazhuang, Hebei Province, 050043, China
Yuhuan Wang — China Design Group Co. Ltd., NO.9, Ziyun Road, Nanjing 210001, China
Ruifeng Li — School of Civil Engineering, ShiJiazhuang Tiedao University, Shi Jiazhuang, China
Dong Wang — TRC Companies, Baton Rouge, United States of America
Haiying Zhang — School of Civil Engineering, Southeast University, Nanjing, China
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