1.Compare the maximum shear stress and the angle of torsion for members of equal lengths and cross-sectional areas with square, rectangular and circular section. All members are subjected to the same torque. The circular section is 100 mm in diameter and the rectangular section is 25 mm wide.
2.A girder that carries a uniformly distributed dead load of 1.7 K/ft plus its self-weight and three concentrated live loads of 15 kips at quarter points of that 36 ft span is to be sized. using A992 steel, determine the lightest W-shape to carry the load with lateral supports provided at the supports and loads point . use the correct Cb and design by LRFD.