Lateral-torsional buckling (LTB) method for the design of glass fins with continuous lateral restraints at the tensioned edge

The lateral torsional buckling (LTB) analysis of glass members is a well-known issue, and can be critical for the design of glass fins that are used to brace slab panels or walls and facades . In this paper, the attention is focused on the LTB analysis of glass fins that are restrained to glass wall panels via continuous, flexible joints able to act as lateral restraints (LRs). Under typical wind pressures, the LTB analysis of fins can be critical for overpressure but especially for suction, given that the LR effect at the compressed or tensioned edge largely modifies. Based on literature efforts, closed-form expressions are presented and validated with the support of geometrically simplified but accurate Finite Element (FE) numerical models. The final result is that for a general configuration, the elastic critical buckling moment of LR fins with tensioned edge restrained can be easily predicted. However, a multitude of parameters can affect the expected effect due to LRs. As such, a simplified linearized formulation is proposed to capture the limit conditions for LRs in a given glass geometry. As shown, the formulations can be used also for laminated glass members, as far as the composite section properties are properly take into account. Finally, worked examples are presented to quantify the potential of LRs for LTB verification purposes.