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# 17.11.2 Bearing strength in shear of attachments with shear lugs,Vbrg,sl

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17.11.2.1
Nominal bearing strength in shear of a shear lug, Vbrg,sl, shall be calculated as:
 Vbrg,sl = 1.7fc'Aef,slψbrg,sl (17.11.2.1)
where ψbrg,sl is given in 17.11.2.2.
17.11.2.1.1
The effective bearing area, Aef,sl, shall be below the surface of the concrete, perpendicular to the applied shear, and composed of areas according to (a) through (d):
(a) Bearing area of shear lugs located within 2tsl of the bottom surface of the base plate if the top or bottom surface of the base plate is flush with the surface of the concrete
(b) Bearing area of shear lugs located within 2tsl of the surface of the concrete if the base plate is above the surface of the concrete
(c) Bearing area of shear lugs located within 2tsl of the interface with stiffeners
(d) Bearing area on the leading edge of stiffeners below the surface of the concrete
17.11.2.2 Bearing factor, ψbrg,sl
17.11.2.2.1
Modification factor, ψbrg,sl, for the effects of axial load, Pu, on bearing strength in shear, shall be determined by (a), (b), or (c):
(a) For applied axial tension:
 (17.11.2.2.1a)
where Pu is negative for tension and n is the number of anchors in tension.
(b) For no applied axial load:
 ψbrg,sl= 1 (17.11.2.2.1b)
(c) For applied axial compression:
 (17.11.2.2.1c)
where Pu is positive for compression.
17.11.2.3
If used, the length of shear lug stiffeners in the direction of the shear load shall not be less than 0.5hsl.
17.11.2.4
For attachments with multiple shear lugs arranged perpendicular to the direction of applied shear, the bearing strength of the individual shear lugs may be considered to be additive provided the shear stress on a shear plane in the concrete at the bottom of the shear lugs, and extending between the shear lugs, does not exceed 0.2fc'. The nominal bearing strength of each individual lug shall be determined by Eq. (17.11.2.1) using the effective area of the lug.

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