20 PROBLEMS IN STRENGTH OF MATERIALS 



126. Calculate the efficiency of a double-riveted lap joint if t = -3^ 

 inch, d = 1 inch, and p = 3| inches. 



127. In a double-riveted lap joint t = | inch, d = 1-Jg inches, and 

 p = 3^ 9 g inches. Find its efficiency. 



128. Find the efficiency of a double-riveted lap joint if t = J inch, 

 d = | inch, and p = 2-| inches. 



129. Determine the efficiency of a double-riveted lap joint if t = -f^ 

 inch, d = i| inch, and ^> = 2 J inches. 



130. Each repeating section of the riveted joint of Problem 129 

 sustains a tension of 7000 pounds. Find the factors of safety. 



131. Find the pitch of a double-riveted lap joint in which t = | inch 

 and d = | inch, so that the strength of the joint against tearing the 

 plates between the rivet holes shall equal the shearing strength of 

 the rivets. Find also the efficiency of the joint. 



132. Determine the efficiency of a single-riveted, two-strap butt 

 joint if t = ! inch, d = l| inch, and p = 2 inches. 



133. Find the efficiency of a single-riveted, two-strap butt joint if 

 t = J inch, d = 1 J inch, and p = 2| inches. 



134. Determine p for a single-riveted, two-strap butt joint in which 

 t = | inch and d = ly 1 ^ inches, so that the strength of the joint against 

 tearing the plates between the rivet holes shall equal the compressive 

 strength of the rivets. Determine also the efficiency of the joint. 



135. Determine the efficiency of a double-riveted, two-strap butt 

 joint if t = | inch, d = l| inch, and p = 3 J inches. 



136. Find the efficiency of a double-riveted, two-strap butt joint if 

 t = | inch, d = 1 inch, and p = 3| inches. 



137. Determine the pitch for a double-riveted, two-strap butt joint 

 in which t = \ inch, and d = \^ inch, so that the strength of the 

 joint against tearing the plates between the rivet holes shall equal 

 the compressive strength of the rivets. What is the efficiency of 

 this joint ? 



138. Each repeating section of the riveted joint of Problem 135 

 sustains a tension of 9000 pounds. Find the factors of safety. 



139. Design a single-riveted lap joint for |-inch plates and find its 

 efficiency. 



140. Design a single-riveted lap joint for |-inch plates and find its 

 efficiency. 



