Experimental Study And Theoretical Analysis On Load Carrying Apacity Of Cold-Formed Flexural Members With Thicknesses Less Than 2mm

For lack of relative experimental data, Chinese current design code, "Technical code of cold-formed thin-walled steel structures" GB50018-2002, is deficient in relevant specifications for the cold-formed steel members whose thicknesses are less than 2mm. To widen the code's scope of application, to understand the behavior of the cold-formed steel members with thickness less than 2mm, and to verify the suitability of the code GB50018-2002, the experimental study and theoretical analysis on the cold-formed steel members whose thicknesses are less than 2mm are very necessary.The paper primarily focuses on the static experimental study on the flexural behavior of the 13 cold-formed lipped channel members with thickness equal to 1mm. Through the test of simulating uniform load, local buckling, deformation and failure features of the members are achieved. Meanwhile, the paper also introduces the test of cold-formed double symmetric I section steel beam assembled by back-to-back two C sections taken from American Iron and Steel Institute (AISI).On the basis of the test results, the load carrying capacity of all the two sorts of test members by using effective width method of Chinese code is calculated in this paper. Comparing the calculated results with the test results, the paper verifies the suitability of the code GB50018-2002 to our research subjects.The paper also uses the nonlinear finite element software-ANSYS to analyze the bending behavior of the the cold-formed lipped channel members with thickness equal to 1mm under uniform loading. The comparision of FEM results and test results show that they are agree well with each other. At the same time, some parameters refer to sectional thickness, web heights are analysed by ANSYS. The anslysis results confirm that the process of calculating load carrying capacity of flexural member according to Chinese code GB50018-2002 is feasible.