Effect of using High Strength Concrete Columns on the Structural Behaviors of Building Frame
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Date
2014-07
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Addis Ababa University
Abstract
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.
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Structures