Moment–Curvature — Circular RC Column
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Section Geometry
Diameter (in)
Clear cover to hoop (in)
Concrete (Expected)
f'ce (ksi)
Ec (ksi)
Ec auto per AASHTO (wc=0.145 kcf)
Longitudinal Reinforcement
No. of bar bundles
Bars per bundle
1
2
3
Bar size (US)
#4
#5
#6
#7
#8
#9
#10
#11
#14
#18
fye (ksi)
fue (ksi)
Es (ksi)
εsh
εsu
Confinement Reinforcing
Bar type
Hoop
Spiral
Bar size
#3
#4
#5
#6
#7
#8
Spacing (in)
fyh (ksi)
εsh - strain at peak stress
Analysis Options
Axial P (kips, +comp)
Fiber layers
εcu limit (0 = auto)
Confined concrete model inside hoops
Continue past failure strain
↻ Run Analysis
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Moment–Curvature Analysis — Circular RC Column
Results of Analysis
Section at φu
Moment–Curvature Diagram
φ =
Cross Section at Selected φ
Steel Stress-Strain Curve (AASHTO)
Concrete Stress-Strain Curve (Mander)
Concrete Stress-Strain (Mander)
Steel Stress-Strain (AASHTO)
Mander et al. (1988) confined/unconfined concrete with original ke (Eqs. 14–15). AASHTO Seismic Guide steel. Bilinear idealization per Priestley et al. (2007). φ per AASHTO LRFD (spiral).