COUPLED INSTABILITIES OF TAPERED CANTILEVERS WITH A T-SHAPED CROSS-SECTION

摘要

This paper presents the results of combined experimental and analyticalumerical studies of the response and instability of tapered cantilevers with a T-shaped cross-section and the tip of the web in compression. Although the design of a T-shaped cross-section with the lower part in compression is not best, it takes advantages in fabrication, corrosion protection and because of the slenderness in aesthetic way. Probably for those reasons, nowadays, tapered or nontapered cantilevers with a T-shaped cross-section can be found in building and bridge design more often. Local and Lateral-Torsional buckling may occur and might be coupled (Distortional Buckling). First, critical loads of a widly range of different cantilever geometries, loading cases and boundary conditions were determined. Next the real load-carrying capacities of those cantilevers were examined. Finally a function of reduction is presented. The load-carrying capacity can be derived easily and, furthermore, now it is possible to do design calculations and optimization of tapered cantilevers with T-shaped cross-section.