Seismic Load Calculator

Calculate seismic story shear force, Ai distribution, and base shear coefficient per Building Standards Law — free earthquake design tool

Seismic Parameters

Zone Factor Z

Vibration Char. Rt

Base Shear Coeff C0

Floor Weights

1FkN

2FkN

3FkN

4FkN

5FkN

Story Shear Distribution

Qi = Ci · Wi, Ci = Z · Rt · Ai · C0

Floor	Weight (kN)	Wi (kN)	αi	Ai	Ci	Qi (kN)
5F	3000.0	3000.0	0.1364	2.0486	0.4097	1229.2
4F	4500.0	7500.0	0.3409	1.5594	0.3119	2339.1
3F	4500.0	12000.0	0.5455	1.3297	0.2659	3191.3
2F	5000.0	17000.0	0.7727	1.1488	0.2298	3905.9
1F	5000.0	22000.0	1.0000	1.0000	0.2000	4400.0
Total	22000.0

Ai Distribution Values

1229.2 kN

2339.1 kN

3191.3 kN

3905.9 kN

4400.0 kN