Design Forces of Horizontal Braces Unlocated at Middle of Columns considering Random Initial Geometric Imperfections

Table 2

Geometric dimensions of horizontal brace sections.

λc	λb	Am/At (cm^2)	Db (mm)	tb (mm)
50	100	28	169.62	5.25
	125	35	135.52	8.22
	150	44	112.45	12.46
	175	55	95.22	18.39
	200	66	80.77	26.01
75	100	27	169.63	5.07
	125	34	135.53	7.99
	150	43	112.48	12.17
	175	54	95.28	18.04
	200	65	80.91	25.57
100	100	24	169.65	4.50
	125	32	135.56	7.51
	150	42	112.51	11.88
	175	53	95.35	17.69
	200	64	81.01	25.14

Note. A_m, A_t—area of brace at mid-height and top of column, respectively; D_b, t_b—diameter and thickness of circular tube section, respectively.