A double riveted lap joint with chain riveting is to be made for joining two plates 10 mm thick. The allowable stresses are : o, = 60 MPa; T= 50 MPa and o. = 80 MPa. Find the rivet diameter, pitch of rivets and distance between rows of rivets. Also find the efficiency of the joint.

The figure shows a horizontal steel bar of thickness h loaded in steady tension and welded to a vertical support. Find the load Fthat will cause an allowable shear stress, Tallow. in the throats of the welds. b = 49 mm, d= 48 mm, h= 5mm, and Tallow = 148 MPa The load Fthat will cause an allowable shear stress in the throats of the welds is kN.

include FBD

(2) h Q11 what the value of P Which are safer on the rivets as shown in figure below. given that : T=100.34 MPa, ob=370.3 MPa, 19mm diameter of .rivets 12.5m 19mm 12.5m 250mm P.