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Reinforced & Prestressed Concrete · CE368
🧱 RC Column Designer
RC Column Designer
Strength design of reinforced-concrete columns to the NSCP 2015 / ACI 318-14. Check the axial capacity of a short tied or spiral column, plot the full P–M interaction diagram for a column under combined axial load and bending, or run a biaxial (Bresler) check. The app reports φPₙ, the utilization against your factored demand, draws the column cross-section and — in interaction mode — the interaction curve with your demand point plotted SAFE or OVER.
⭐ Free to use · Balance … EP
Design mode
Short concentric column — pure axial capacity φPₙ,max and utilization.
① Materials
② Column type & section
③ Longitudinal steel
One Ø25 = 491 mm², Ø20 = 314 mm², Ø28 = 616 mm², Ø32 = 804 mm².
④ Factored load (optional — for utilization)
Leave blank to report capacity only. With Pu the app gives the utilization Pu/φPn,max and a SAFE / OVER verdict.
② Rectangular section (bending about x — depth h)
Distance from the face to the centre of the nearest bar layer (clear cover + tie + ½ bar).
③ Longitudinal steel
Bars along the top face = along the bottom face.
④ Factored demand
The demand point (Mu, Pu) is plotted on the φ curve — inside = SAFE, outside = OVER.
🧱 Results
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Column cross-section
Worked solution
⚠️ Preliminary / verification aid. Results follow NSCP 2015 /
ACI 318-14 strength design for a short column. Slenderness, minimum
eccentricity, detailing (tie spacing, bar arrangement, splices) and
load combinations must be confirmed by full design before construction.
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