ABSTRACT
Hot-rolled steel sections are rolled from hot slabs of steel, and the web and flanges are thick and stocky. Thin-walled sections, such as plate girders, are composed of thin plates. The compression stresses induced by bending can cause local buckling to initiate failure, and this complicates design considerably. This chapter focuses on the calculation of the shear strength and bending strength of hot-rolled sections and also considers the calculation of thin-walled sections. Technicians at steel mills test all rolled sections thoroughly, and any members that fail to achieve the design stress are reclassified. As a result, the actual yield stress of steel members tends to be higher than assumed during design. Von Mises yield criteria is the basis of the shear strength calculations for hot-rolled steel beams. Shear stresses can cause buckling of thin plates. Von Mises yield criteria show that shear stresses reduce the tensile or compressive stress required to cause yielding.
