Flexural Buckling of Simply Supported Columns with "Rigid End Links" - the Key to Interpret Pin-Ended Angle Column Test Results?
The paper begins by deriving and validating an analytical expression providing flexural buckling loads of uniformly compressed simply supported columns formed by a flexible central segment and two “rigid end links”. It proves that the end links lower the buckling load by an amount varying with the link length, at a rate that is very high for small lengths. Then, this finding is used to re-interpret available test results on simply supported angle columns with intermediate lengths (i.e., exhibiting critical flexural-torsional buckling), by showing that the rigid links used in these tests provide a mechanically sound explanation for their (apparently paradoxical) observed failure modes, involving exclusively minor-axis flexure. In order to further assess the impact of the rigid end links on the intermediate angle column structural response, the paper closes with a numerical investigation concerning the comparison between the elastic post-buckling behaviors (non-linear equilibrium paths) of columns with rigid end links exhibiting various lengths.
- Date: 4/18/2012 - 4/20/2012
- PDH Credits: 0
Enio Mesacasa; Jr.; University of Sao Paulo; Sao Paulo; Brazil; Dinar Camotim; Pedro Borges Dinis; Technical University of Lisbon; Lisbon; Portugal; Maximiliano Malite; University of Sao Paulo; Sao Paulo; Brazil