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eng.punching-shear-check Calculator
Calculates punching shear demand and capacity around a column-to-slab connection per ACI 318. Punching shear failure is sudden and brittle — shear stud rails or drop panels are required when the critical section shear stress exceeds φVc.
Inputs
V Kn
Reference formula or conversion factor shown for context.
D Mm
Vertical extent downward, or thickness of a layer. For tanks: affects pressure at the base (P = ρgh).
C Mm
Reference formula or conversion factor shown for context.
Fc Mpa
Reference formula or conversion factor shown for context.
Results
critical perimeter b₀ (m)
The total boundary length of the shape.
punching shear resistance Vc (kN)
Opposition to current flow (Ω). Ohm's Law: V = IR. Lower resistance means more current for the same voltage.
demand/capacity ratio V/Vc
The proportional relationship between two quantities.
verdict
Qualitative pass/fail or risk assessment based on the calculated score. Always examine the underlying numbers — classification boundaries are simplified guidelines.
vc = 0.33√fc (MPa) [ACI 318]
Reference formula or conversion factor shown for context.