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In biaxial bending, the compression zone of a concrete column naturally forms a curved, parabolic-like profile. As shown in the figure, the compression zone boundary emerges from the extreme compression fibre intersection point and curves toward the neutral axis (NA), responding to the combined bending about both principal axes. This parabolic compression zone does not…
In reinforced concrete columns under biaxial bending, the compression zone ideally follows a parabolic shape. However, calculating this exact profile is complex. To simplify design while maintaining safety, Eurocode 2 (EN 1992-1-1, Section 3.1.7(3)) introduces an easy approximation. The compression zone is bounded by two limits along the breadth (αδb) and height (αδh) and runs…