A steel beam, of lengths a=4 m and b= 3 m and a hollow box cross section, is supported by a hinge support A and roller support B, see Figure Q.1. The width and height of the cross section are 200 mm and 300 mm, respectively, and the wall thickness of the cross section is 5 mm. The beam is under a distributed load of the intensity that linearly varies from q=0 kN/m to q = 5.3 kN/m for AB span; and is constant with q= 5.3 kN/m for BC span. The Young's modulus of steel is 200 GPa. y A commitm Дв C b a 5 mm 200 mm 300 mm X

A simple pin-connected truss is loaded and supported as shown. All members of the truss are aluminum pipes that have an outside diameter of 80mm and a wall thickness of 6mm. Determine the normal stress in each truss member. 1.0 m 1.5 m B 3.3 m 15 KN 12 kN 90 kip