| Summary: | 碩士 === 國立中興大學 === 土木工程學系 === 89 === The column is an important element in a structural system. The study of column buckling can be traced back to Leonhard Euler. Euler presented his elastic buckling theory of column in 1744, Considere and Engesser introduced the tangent modulus theory in 1889, and the real behavior of column was explained by Shanley in 1946. The American Institute of Steel Construction (AISC) based on the column research in the past and presented the column design formulas in the LRFD Design Specification of 1994.
The evaluation of singly symmetric sections, which include double angles and T, require the analysis of torsional or flexural-torsional buckling in addition to flexural buckling and the provided formulas in LRFD Design Manual are long and complex. In this study, the critical buckling stress Fcr for column with singly symmetric section is summarized and carefully examined. The calculation of Fcr for each buckling mode is a long and tedious process and it is not an efficient way to evaluate the value of Fcr through this long process in routine design. This study provides an easy and fast approach, which is a computer way, to solve the problem. Both hand and computer calculations are presented in each selected example and the results are also compared. It was found that the computed values of double angles sections do not match with the tabulated values in the LRFD Design Manual of 1994, however, the calculated values do match with the ones in the LRFD Design Manual of 1986.
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