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# 17.11.2 *Bearing strength in shear of attachments with shear lugs,* **V**_{brg,sl}

_{brg,sl}

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17.11.2.1

17.11.2.1.1

The effective bearing area,

**, shall be below the surface of the concrete, perpendicular to the applied shear, and composed of areas according to (a) through (d):***A*_{ef,sl}(a) Bearing area of shear lugs located within

**2**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*t*_{sl}(b) Bearing area of shear lugs located within

**2**of the surface of the concrete if the base plate is above the surface of the concrete*t*_{sl}(c) Bearing area of shear lugs located within

**2**of the interface with stiffeners*t*_{sl}(d) Bearing area on the leading edge of stiffeners below the surface of the concrete

17.11.2.2

*Bearing factor*,*ψ*_{brg,sl}17.11.2.2.1

Modification factor,

**ψ**, for the effects of axial load,_{brg,sl}**, on bearing strength in shear, shall be determined by (a), (b), or (c):***P*_{u}(a) For applied axial tension:

(17.11.2.2.1a) |

(b) For no applied axial load:

ψ_{brg,sl}= 1 | (17.11.2.2.1b) |

(c) For applied axial compression:

(17.11.2.2.1c) |

where

**is positive for compression.***P*_{u}17.11.2.3

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

**0.2**. The nominal bearing strength of each individual lug shall be determined by Eq. (17.11.2.1) using the effective area of the lug.*f*'_{c}### Related Code Sections

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*Bearing strength in shear of attachments with shear lugs,***V**_{brg,sl}Nominal

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