POST BUCKLING BEHAVIOR OF TEE SHAPED ALUMINUM COLUMNS.
MICHIGAN UNIV ANN ARBOR DEPT OF CIVIL ENGINEERING
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The post buckling behavior of a tee shaped column of aluminum alloy was studied. Attention was focused on the cases where the buckling is initiated in the plane of symmetry. The effects of initial curvature and eccentric loading in the plane of symmetry and in the directions towards or away from the flange received consideration. In the cases where the buckling starts in the direction away from the flange, the flange of the tee section is subjected to increasing compressive stress and there are corresponding decreases in the value of the tangent modulus while increasing areas of the web are subjected to strain regression at the elastic rate. A series of tests was conducted to confirm the theoretical predictions. To carry out the experiments, a procedure of measuring the lateral displacements and the twist of the hinged-end columns in combined bending and torsion was developed. The results of the incremental analyses are presented in the form of tables and graphs. These results include the ultimate load carrying capacity of tee columns of various slenderness ratio with various amounts of initial crookedness in buckling towards or away from the flange, comparison of initial crookedness and the eccentric loading, comparison of the assumed half-sine curve deflection shape and the more exact deflection shape, some selected graphs of the load-deflection history and finally the results of the experiments in the form of a table and some graphs. Author
- Structural Engineering and Building Technology