1 inch = 25.4 mm
-
Block shear rupture strength of plate:
φ n = φ0.6FyAgv + FuAnt)
R
(
AISC LRFD Eq. J4-3a
φ n = 0.75(0.50)[(0.6)(36)(2 x 8"/cos 30) + (58)(12.7)] = 388 k (1726 KN) > 120.4 k (536 KN)
R
φ n = φ0.6FuAnv + FyAgt]
R
[
AISC LRFD Eq. J4-3b
φ n = 0.75(0.5) [(0.6)(58)(2 x 8) + (36)(12.7)] = 380 k (1690 KN) >120.4 k (536 KN)
R
-
Buckling of plate:
Buckling capacity of the brace = AgFcr = (2.23)(11.65) = 25.98 k (116 KN) (buckling strength
determined previously)
1 inch = 25.4 mm
4000t 3 f y
4000(1 / 2) 3 36
= 0.90
= 284 k (1263 KN) > 25.98 (116 KN)
0.90
lc
9.5
-
Out-of-plane strength of plate: The bracing member can buckle both in and out of plane due to the
round section used. For out-of-plane buckling the gusset plate must be able to accommodate the
rotation by bending. The brace shall terminate on the gusset a minimum of two times the gusset
thickness from the theoretical line of bending which is unrestrained by the column or beam joints.
H1-59
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