J7Bearing strength

The design bearing strength, $\phi R_{n}$, and the allowable bearing strength, $R_{n} / \Omega$, of surfaces in contact shall be determined for the limit state of bearing (local compressive yielding) as follows:

$\phi=0.75$ (LRFD) $\quad \Omega=2.00$ (ASD)

The nominal bearing strength, $R_{n}$, shall be determined as follows:

• (a) For finished surfaces, pins in reamed, drilled, or bored holes, bolts or rods that pass completely through an unstiffened box or HSS member, and ends of fitted bearing stiffeners

(J7-1)

where

$\begin{aligned} A_{p b} & =\text { projected area in bearing, in. }^{2}\left(\mathrm{~mm}^{2}\right) \\ F_{y} & =\text { specified minimum yield stress, ksi (MPa) }\end{aligned}$

• (b) For expansion rollers and rockers
• (1) When $d \leq 25$ in. (630 mm)

(J7-2)

$R_{n}=\frac{1.2\left(F_{y}-90\right) l_{b} d}{20}$ (J7-2M)

(2) When $d>25\mathrm{~in.~}(630\mathrm{~mm})$

(J7-3)

(J7-3M)

where $d =$ diameter, in. (mm) $l_b =$ length of bearing, in. (mm)