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AISC LRFD Bearing Strength at Bolt Holes

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In the AISC LRFD 3rd Edition, Section J3.10 (p. 16.1-66), Eq. J3-2a
gives the value for the design bearing strength at a single bolt hole.
The equation includes Lc, which is the "clear distance, in the direction
of the force, between the edge of the hole and the edge of the adjacent
hole or edge of the material."

Picture a typical tension member, say double angles with a series of
bolts in a single line, with 3" spacing between bolts, and 1-1/4"
between the last bolt and the end of the angle.  This equation gives a
smaller value (since Lc is smaller) for the end bolt than for all the
other bolts.

My question is: In the connection for this member, is this correct that
one bolt has a smaller value, and the value for the connection would be
the sum of the values for the individual bolts? It seems a little
strange that this one bolt would know to bear less than the other bolts.
This case was not in the 2nd Edition, since bolts with 1.5d edge
distance or 3d spacing were treated the same.

Rick Burch
Columbia, SC

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