REVERSING-STRESSES.

In case stresses reverse, the areas required for both tension and compression, including impact in each case, are to be figured separately, and three fourths (3/4) of the smaller area is to be added to the larger area in order to obtain the total sectional area of the piece. The rivets, however, are to be figured for the sum of the two stresses, both impacts included.

The effect of reversion of stresses in case of wind loads is to be ignored when computing sectional areas of members and the number of rivets required; but, of course, wherever reversion of stress occurs, the piece must be stiffened so as to resist compression.

NET SECTION.

The net section of any tension flange or member shall be determined by a plane cutting the member square across at any point. The greatest number of rivet-holes which can be cut by any such plane, or whose centres come nearer than two and a half (2 1/2) inches to said plane, are to be deducted from the gross section when computing the net area.

BENDING MOMENTS ON PINS.

In figuring the bending moments on pins, the stresses shall be assumed as concentrated at centres of bearings.