Experimental Study and Direct Strength Method for Cold-Formed Steel Built-Up I-Sectional Columns under Axial Compression

Figure 6

Initial imperfections of channel sections. (a) DC7510-05-S150-N-1. (b) DC9008-05-S150-N-1. (c) DC7510-15-S150-N-1. (d) DC9008-15-S150-N-1. (e) DC7510-20-S150-N-1. (f) DC9008-20-S150-N-1.

(a)

(b)

(c)

(d)

(e)

(f)