On the Torsional Distorsions of Long-spanned, Four-walled Trussed Structures

Abstract

In this paper the torsional deformation of four walled stiffening girders is investigated from the theoretical point of view and the results are compared with experimental results performed on the two types of models, namely the so-called plate-girder type model and the truss type model. The Torsion-box theory is applied for analysis of torsional behaviour of four trussed-walled box girder beams. However the truss type girder can resist torsion less compared with the ideal thin-walled girder and can be characterized by the modified form of the Two-spar theory rather than the Torsion-box theory.