Structural behavior of high-strength composite columns under lateral cyclic loads

What is it about?

Abstract The lateral cyclic behavior of composite concrete and double-skin steel tube columns was used as an experimental study in this paper. Six section columns three of them were square sections which had a side length of (100) mm from the outside, an inner side length of (50) mm and the other were circular which had a diameter of (115) mm from the outside, an inner diameter of (61) mm, all specimens have a length (800) mm, with high-strength concrete about 60 MPa were subjected to lateral cyclic loading. Different parameters, including the axial force level and tube shape, were discussed. The dynamic responses, including failure modes, the histories of lateral deflection–displacement, and the histories of cyclic force with time, were investigated. The effect of lateral force resistance of composite columns with an applied axial force of approximately 70 kN can be compared with an applied axial force of about 40 kN and those without any axial force the result of this comparison in circular sections is,12.96%,19.35%, and 5.65% respectively and for square is 6.64%,16.63%, and 9.36% consecutively. The experimental study also compared the effect of the shape to resist the lateral load. The test results prove that the circular sections resisted the effect of the lateral load with 12.55 %, 6.25%, and 10% respectively more than the resistance of specimens with a square section under the same conditions of projecting Axial loads.

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Photo by Cheung Yin on Unsplash

Photo by Cheung Yin on Unsplash

Why is it important?

The composite columns have low cost because of their low cross-section and ability to withstand high seismic and wind loads. Composite columns are widely used in current times because it has many advantages such as the high tensile strength of steel and economic benefits, and the ability to resist high compression strength for concrete makes the two materials work together well