Page 189 - Handbook of Civil Engineering Calculations, Second Edition

1.172 STRUCTURAL STEEL ENGINEERING AND DESIGN

Calculation Procedure:

1. Record the relevant properties of the W18 60
The connection is shown in Fig. 5a. Referring to the row of rivets in Fig. 5b, consider that
there are n rivets having a uniform spacing p. The moment of inertia and section modulus
of this rivet group with respect to its horizontal centroidal axis are
2
n – 1 pn(n + 1)
I p n S (3)
2
12 6
Record the properties of the W18 60: d 18.25 in. (463.6 mm); b 7.558 in. (192
mm); k 1.18 in. (30.0 mm); t f 0.695 in. (17.7 mm); t w 0.416 in. (10.6 mm).
2. Establish the capacity of a rivet
Thus: single shear, 9.02 kips (40.1 kN); double shear, 18.04 kips (80.2 kN); bearing on
beam web, 0.875(0.416)(48.5) 17.65 kips (78.5 kN).
3. Determine the number of rivets required on line 1 as governed
by the rivet capacity
Try 15 rivets having the indicated disposition. Apply Eq. 3 with n 17; then make the
2
2
2
necessary correction. Thus, I 9(17)(17 – 1)/12 – 2(9) 3510 sq.in. (22,645 cm ); S
3510/24 146.3 in. (3716 mm).
Let F denote the force on a rivet, and let the subscripts x and y denote the horizontal
and vertical components, respectively. Thus, F x M/S 2500/146.3 17.09 kips

FIGURE 5. Riveted moment connection.