Base Shear Calculator

Compute the NSCP 2015 static design base shear V (period T_A, all code limits checked), distribute it over the storeys (with the top force F_t), get story shears & overturning moment, and check the dynamic (response-spectrum) scaling rule against your RSA base shear.

⭐ Free to compute · Balance … EP

⚠️ Educational tool — verify against NSCP 2015. C_a, C_v are from NSCP 2015 Tables 208-7 / 208-8 (Zone 4 × N_a, N_v). Confirm Z, soil profile, R, I, C_t and the storey weights against the code and your design basis.

① Seismic site

Seismic zone (Z)

Soil profile type

Near-source N_a

Near-source N_v

C_a override

C_v override

② Structure

Response modification R

Importance factor I

Period method (C_t) — Method A: T = C_t·h_n^0.75

Total height h_n (m) opt.

Period T override (s) opt.

③ Storey weights & heights (top → bottom or any order)

Level

Weight w_i (kN)

Height h_i (m)

h_i = height of that level above the base. Total seismic weight W = Σw_i.

🏢 Base shear & distribution

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NSCP 2015 §208.5 static lateral force procedure

Period T

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Total weight W

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Design base shear V

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Top force F_t

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V / W

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Overturning M

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Vertical force distribution

Level	w_i (kN)	h_i (m)	w_ih_i	F_x (kN)	V_x (kN)