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6.7.3 Buckling of Plates. When compressive in-plane forces are applied to a plate, the plate will at first remain flat and simply be compressed. However, when the in-plane forces reach a critical level, the plate will bend and the deflection will be given by the solution to 6.7.6.
Structural engineers occasionally need to determine the section properties of steel shapes not found in the current edition of the Handbook of Steel Construction (CISC 2000). The following pages provide the formulas for calculating the torsional section properties of structural steel shapes.
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Torsion refers to the twisting of a structural member when it is loaded by couples that produce rotation about the longitudinal axis. The couples that cause the tension are called Torques, Twisting Couples or Twisting Moments. Torsion of Circular Bar. From consideration of symmetry:
In most steel-framed structures, beams are subject only to bending and not to torsion. In buildings, beams are usually hot rolled I or H sections, proportioned for optimum bending performance about their major axis.
Chapter Objectives. Determine the shear stresses in a circular shaft due to torsion. Determine the angle of twist. Analyze statically indeterminate torque-loaded members. Analyze stresses for inclined planes. Deal with thin-walled tubes. Torsion of shafts.
Chapters 2 and 3 provide an overview of the fundamentals and basic theory of torsional loading for structural steel members. Chapter 4 covers the determination of torsional stresses, their combination with other stresses, Specification provisions relating to torsion, and serviceability issues.
