Twisting is the movement that occurs when a structure is subject to torsional load and subsequently rotates around its longitudinal axis. The twist can be minimized by increasing the torsional stiffness of the structure. The torsional stiffness can be increased by changing the way structural members are connected to one another, by changing the members’ cross sectional shape and increasing plate thicknesses.
Measures to reduce twist in a structure include utilizing closed profiles, such as tubes or closed channels, which offer better torsional rigidity and warping resistance compared to open sections. Additionally, changing the cross-sectional shape of members to a shape with a greater torsional rigidity, such as rectangular or circular shapes, can help improve torsional stiffness and reduce twist. Increasing the thickness of plates and/or increasing the outer dimensions can also improve torsional stiffness and reduce twist in structures.