LATERAL BUCKLING STABILITY OF TRUSSED BEAM WITH UNDER UNIFORMLY DISTRIBUTED LOADS

The present paper investigates the lateral stability of unrestrained lattice girder. According to the European steel code, Eurocode 3, the unrestrained beam buckling resistance is a function of the theoretical lateral buckling moment of the beam. The expression of the lateral buckling moment is proposed by the Code for solid webgirder; however, no information is given for the case of trussed beam. Lattice girder, which can provide relatively light structures with high rigidity, are often used as beams, and when such unrestrained elements bend about their strong inertia axis, they exhibit a lateral buckling phenomenon. The paper presents a model that was developed for the analysis of the lateral buckling stability of trussed beams with constant cross section. Based on this model, an expression of the lateral buckling moment is established in the case of uniformly distributed loads.