RIVETED JOINTS AND CONNECTIONS 



LSI 



D = depth from top of girder to bottom of floor beams, 

 d = depth of floor beams back to back of angles or 



flanges of beams, 

 W = width center to center of girders. 



Shear in webs of plate girders, net section 



Shear in pins and shop-driven rivets 



Shear in field-driven rivets 



Tension in extreme fiber of flanges of beams proportioned 

 by moment of inertia, net section 



Tension or compression in the extreme fiber of pins, .assum- 

 ing the stresses to be applied in the centers of bearings . . . 



Bearing on pins in members not subject to reversal of stress, 



Bearing on pins in members subject to reversal of stress, 

 using the greater of the two stresses 



Bearing on shop-driven rivets and stiffeners of girders, and 

 other parts in contact 



Bearing on concrete masonry 



Bearing on sandstone and limestone masonry 



Bearing on expansion rollers in pounds per lineal inch, 

 where d = diameter of roller in inches 



13,500 lb./in. 2 



13,500 lb. /in. - 

 10,800 lb./in.^ 



18,000 lb./in. 2 



27,000 Ib./in. 2 

 24,000 lb./in. 2 



12,000 lb./in. 2 



27,000 lb./in. 2 



.><><> lb./in. 2 

 400 lb./in. 2 



000 d. 



APPLICATIONS 



257. In a single-riveted lap joint calculate the pitch of the rivets and the dis- 

 tance from the center of the rivets to the edge of the plate under the assumption 

 that the diameter of the rivets is twice as great as the thickness of the plate. 



Solution. Consider a strip of width equal to the rivet pitch, that is, a strip con- 

 taining one rivet. Let q denote the unit shearing strength of the rivet and p the 

 unit tensile strength of the plate. Then if h denotes the thickness of the plate, in 

 order that the shearing strength of the rivet may be equal to the tensile strength 

 of the plate along the line of rivet holes, we must have 



Since the rivet is usually of better material than the plate, we may assume that the 

 ultimate shearing strength of the rivet is equal to the ultimate tensile strength 

 of the plate ; that is, assume that p = q. Under this assumption the above relation 

 becomes 



? = <_ )* = ;-<); 



whence 



c = 2.5d, approximately. 



Similarly, in order that the joint may be equally secure against shearing off the 

 rivet and pulling it out of the plate, that is, shearing the plate in front of the rivet, 

 the condition is 



