Solution to Problem 130 Bearing Stress

Problem 130
Figure P-130 shows a roof truss and the detail of the riveted connection at joint B. Using allowable stresses of τ = 70 MPa and σb= 140 MPa, how many 19-mm-diameter rivets are required to fasten member BC to the gusset plate? Member BE? What is the largest average tensile or compressive stress in BC and BE?
 

130-simple-truss.gif

 

130-connection-details-simple-truss.gif

 

Solution 130

 

Comments

Good day. I would like to ask a clarification max tensile/compressive stress on the members.
Why did we use A=Area-dt for member BC, but for member BE, we just used the given area of 1780?
Maraming salamat po.