Effect of using High Strength Concrete Columns on the Structural Behaviors of Building Frame

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Addis Ababa University


High strength concrete (HSC) has been used in the lower story columns of high rise buildings owing to its qualities over normal strength concrete (NSC) in many countries. But, the full structural qualities of the HSC were unable to be used because of insufficient information regarding the structural behavior of the material and its properties were not adequately addressed in building codes including EBCS. Analytical study was conducted at structure level to investigate the effect of using HSC column on the structural behavior of regular models of medium to high rise frame buildings under seismic lateral load in addition to gravity loads. Concrete strength variations of C30 to C90MPa were applied on the columns of the frame models. The proposed properties of the HSC class were incorporated in the analysis and design of the columns. The frames analysis was done using ETABS and columns were designed based on the EBCS column design procedure. Columns moment- curvature curves were developed and maximum interstorey drifts were obtained for the different frame models with variation in columns concrete strength. The study shows that frames with HSC columns have got lower stiffness and performed well in satisfying ductility demand. The maximum interstorey drifts are slightly higher for frames with HSC columns, but the contribution of the concrete strength in resisting the lateral deformations was significant. Economic comparisons were also made and it was found that the most economical frame corresponds to frame with the highest columns concrete strength.