The St. Venant torsional section refers to a constant in the equation that determines the stress of a section of steel and the buckling moment resistance for unsupported beams that run sideways. Flexural-torsional buckling of compression members refers to the simultaneous bending and twisting of an upright load-bearing section of steel. "J" is used to denote the torsional constant in the calculation.
The warping property refers to the nonuniform or warping torsion of a steel section or beam and how it is calculated when determining a steel section's warping capabilities. "Cw" is used in the calculation to represent this mathematical torsional constant.
An I-beam with its top section larger than its bottom is defined as a beam with monosymmetry torsional properties and incorporates properites of these beams loaded symmetrically. The torsional constant in the calculation used to determine this torsional section property is denoted by "βX."
The HSS (hollow beams) torsional sectional property denotes the sheer stress as the result of an applied torque to a steel beam. Engineers use "C" in the calculation for this torsional constant.
The shear center is the point in the plane where the twisting occurs. The shear center is needed for determining the warping torsional and monosymmetry constants in the equation. Additionally, the shear center is needed to find the destabilizing effect of gravity loading beneath or above the shear center. The shear center's coordinates are figured in accordance with the centroid.