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Units
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stirrup size
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Uniform load
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Stirrup spacing
for uniform load:
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Data
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Capacity of concrete to resist shear, Vc
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0.5Vc (upper boundary for Zone I: when shear force divided by φ
is below this value, no stirrups are needed)
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3Vc (this value of shear force divided by φ is boundary between
Zones III and IV -- "reduced" max. spacing governs in Zone IV;
"regular" in Zone III)
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5Vc (upper boundary for Zone IV, above which shear force divided
by φ is too great and beams are not permitted)
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Maximum shear force divided by φ at distance, d, from face of
support
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Shear force divided by φ corresponding to "regular"
maximum spacing
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Shear force divided by φ corresponding to "reduced"
maximum spacing
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Maximum spacing, unrounded (when Vs <= 2Vc)
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Maximum spacing, reduced and unrounded (when Vs > 2Vc)
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Warnings
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Concrete cylinder strength f'c must be greater
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Steel yield stress must be greater
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Beam width, b, must be greater
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Beam effective depth, d, must be greater
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Shear force Vu must be greater than zero
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Span must be greater than zero
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Span must be at least 4 times the effective depth
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Stirrup spacing too small; try using larger stirrup size or
larger beam
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Criteria for small
total beam depth
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