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sci.base-shear-seismic-ASCE7 Calculator
Calculates seismic base shear V = Cs × W from ASCE 7 equivalent lateral force procedure, where Cs depends on spectral response acceleration, occupancy category, and structural system. Base shear determines the lateral loads distributed to each floor — irregular structures and soft soil amplify seismic demand above code minimums.
Inputs
Sa G
Rate of velocity change (m/s²). Earth's gravity: 9.81 m/s². Objects in free fall accelerate at this rate.
W Kn
Body or object weight. For health calculators, usually in kg or lbs.
R Factor
A multiplier applied in the calculation.
I E
A multiplier applied in the calculation.
Results
seismic base shear V (kN)
Sample size or count used in the calculation.
seismic coefficient Cs
Sample size or count used in the calculation.
overturning moment estimate (kN·m)
The value at the specified point or condition.
ASCE 7: V = Cs·W; Cs = Sa·Ie/R
Reference formula or conversion factor shown for context.
R factor
A dimensionless multiplier applied in the calculation.
Cs minimum check
The smallest value in the dataset or feasible range.