WSEAS Transactions on Applied and Theoretical Mechanics
Print ISSN: 1991-8747, E-ISSN: 2224-3429
Volume 9, 2014
Initial Imperfections of Steel and Steel-Concrete Composite Columns Subjected to Buckling Compression
Authors: ,
Abstract: The paper deals with the problems of the load-carrying capacity of steel and steel-concrete composite members composed of high-strength materials, subjected to compression. The attention is mainly paid to the buckling resistance in the connection with member imperfections, which are usually covered by the equivalent initial geometrical imperfection expressed as the maximal initial member curving in the mid-length of the buckled member subjected to compression. The paper is oriented to the analytical solution of the initial eccentricity based on the conception of the buckling strength and to the possibilities how to verify the initial imperfection experimentally. The analysis of this problem is shown on the examples of steel and steel-concrete composite columns represented by open HEA cross-section and the same cross-sections partially encased by concrete, and by steel circular tubes and steel tubes filled by concrete, in both cases applying normal-strength and high-strength concrete. Using test results of the specimens subjected to compression the comparison of actual values of initial imperfections with the corresponding theoretical values is presented here.
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Keywords: Column buckling, compression, resistance, strength, imperfection, eccentricity, steel, concrete, HEA cross-section, circular cross-section, theoretical analysis, experimental verification, Southwell’s line
Pages: 27-34
WSEAS Transactions on Applied and Theoretical Mechanics, ISSN / E-ISSN: 1991-8747 / 2224-3429, Volume 9, 2014, Art. #3