A Comparative Study of Limits on Normalized Axial Loads of Es-En 1998:2015 With Other Current Major Building Codes on Columns
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Date
2024-04
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Addis Ababa University
Abstract
Axial loads highly affect the behavior of reinforced concrete members, such as failure mode,
yield curvature, ultimate curvature, curvature ductility, beam-column joint, etc. In order to limit
the adverse effects of axial loads, Ethiopian Standards based on Euro-Norms limits normalized
design axial compressive loads. This research explores the basis for these limits and then
compares them with other major codes and standards. The primary aim for these limits is for the
axial loads not to exceed loads at balanced failure, . To study the balanced conditions, a
series of interaction charts were constructed with the confinement effect of transverse
reinforcement on concrete considered. The three main parameters for the charts are the distance
of compression reinforcement from the extreme compression fibres normalised with respect to
effective depth, ⁄ , mechanical reinforcement ratios, , and mechanical volumetric ratio
of confining reinforcement, . Sectional properties, i.e., yield curvature, ultimate curvature and
curvature ductility, under the obtained balanced axial loads were compared to their perspective
limits. It was concluded that is highly affected by , and to a lesser extent by and . It
has an inversely proportional relationship with both , and . Fifteen different column section
was also considered as an example, and their results are in alignment with the interaction
charts. From the results obtained, it can be concluded that the limits can be more directed for
values of . This is especially the case for column sections having lower values of which
show a greater load capacity than the set limits.
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Keywords
Axial Loads of Es-En 1998:2015, Building Codes, Columns