Building Design and Construction Handbook - Merritt - Ventech!

COLD-FORMED STEEL CONSTRUCTION 8.39
11 3
P n/2
� (4 � ⁄16) � (⁄16) � 0.568 � 48 � 16.93 kips
P � 33.86 kips
n
Compare sections 1-1 and 2-2, P n � 23.37 kips. The allowable load is:
P � P /� � 23.37/2.22 � 10.53 kips
a n
This compares with the tensile strength of each sheet for tension member design:
The allowable load is:
11 3
Pn � AF n sy � [4 � ⁄16]( ⁄16) � 33 � 20.50 kips
P � P /� � 20.50/1.67 � 12.28 kips
a n
Use P a � 10.53 kips.
The minimum distance between a bolt center and adjacent bolt edge or sheet
edge is for Case 1:
For Case 2:
3
e � P/Fut� (9.72/2)/(48 � ⁄16) � 0.54 in
e � e� � 0.54 � 2 � 1.08 in
min
3
e � (10.53/2)/(48 � ⁄16) � 0.59 in
emin � 0.59 � 2 � 1.18 in
The bearing strength P n per bolt of the 3 ⁄16-in-thick steel sheet is:
5 3
Pn � Fp dt � (3 � 48) � ⁄8 � ⁄16 � 16.88 kips
The allowable bearing load for two bolts:
P � 2P /� � 2 � 16.88/2.22 � 15.21 kips � 10.53 kips O.K.
a n
Using the A325 bolts with threads not excluded from the shear plane, the
allowable shearing strength of each bolt is:
5 2
Ps � AF b nv/��
(⁄8) � 0.7854 � 54/2.4 � 6.9 kips
For two bolts, the allowable load is:
P � 2 � 6.9 � 13.8 kips � 10.53 kips O.K.
a
In summary, the allowable loads for Cases 1 and 2 are 9.72 kips and 10.53 kips,
respectively. The shear capacity of bolts should also be checked.