Solution to Problem 129 Bearing Stress

Problem 129
129-timbers-bolted-together.gifA 7/8-in.-diameter bolt, having a diameter at the root of the threads of 0.731 in., is used to fasten two timbers together as shown in Fig. P-129. The nut is tightened to cause a tensile stress of 18 ksi in the bolt. Compute the shearing stress in the head of the bolt and in the threads. Also, determine the outside diameter of the washers if their inside diameter is 9/8 in. and the bearing stress is limited to 800 psi.
 

Given:
Diameter of bolt = 7/8 inch
Diameter at the root of the thread (bolt) = 0.731 inch
Inside diameter of washer = 9/8 inch
Tensile stress in the nut = 18 ksi
Bearing stress = 800 psi
 

Solution to Problem 128 Bearing Stress Jhun Vert Mon, 04/20/2020 - 02:00 pm

Problem 128
128-beam-girder-connection.gifA W18 × 86 beam is riveted to a W24 × 117 girder by a connection similar to that in Fig. 1-13. The diameter of the rivets is 7/8 in., and the angles are each L4 × 3-1/2 × 3/8 in.. For each rivet, assume that the allowable stresses are τ = 15 ksi and σb = 32 ksi. Find the allowable load on the connection.
 

Solution to Problem 126 Bearing Stress Jhun Vert Mon, 04/20/2020 - 01:46 pm

Problem 126
The lap joint shown in Fig. P-126 is fastened by four ¾-in.-diameter rivets. Calculate the maximum safe load P that can be applied if the shearing stress in the rivets is limited to 14 ksi and the bearing stress in the plates is limited to 18 ksi. Assume the applied load is uniformly distributed among the four rivets.
 

126-plates-four-rivets.gif

 

Solution to Problem 125 Bearing Stress Jhun Vert Mon, 04/20/2020 - 01:44 pm

Problem 125
In Fig. 1-12, assume that a 20-mm-diameter rivet joins the plates that are each 110 mm wide. The allowable stresses are 120 MPa for bearing in the plate material and 60 MPa for shearing of rivet. Determine (a) the minimum thickness of each plate; and (b) the largest average tensile stress in the plates.
 

125-plates-rivet-single-shear.gif