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TBDY 2018 base shear (equivalent lateral force)

Equivalent lateral force base shear VtE = mt·SaR(T1), the reduction factor Ra(T1), and the minimum base shear check 0.04·mt·g·I·SDS.

Inputs

S_DS

S_D1

First-mode period T1 [s]

From modal analysis or the TBDY §4.7 approximate formula.

Total seismic weight [ton]

Mass = weight/g is handled internally; enter weight in metric tons.

R and D from TBDY 2018 Tablo 4.1 for your structural system; I from Tablo 3.1.

Results

S_ae(T1) [g]—

R_a(T1)—

V_tE [kN]—

V_tE,min [kN]—

Governing base shear—

Citations

§4.2.1Ra(T): T>TB → R/I; T≤TB → D+(R/I−D)·T/TB (Denk. 4.1).

§4.7VtE = mt·SaR(T1), SaR = Sae/Ra; VtE,min = 0.04·mt·g·I·SDS (Denk. 4.19).

VERIFYReproduces a published worked example: 300 t, R=8, D=3, I=1, T1=0.517 → VtE=403.6 kN ≥ 195.1 kN.

Engine: seismic-tr.js v0.1.0 · Code pack: TR-TBDY-2018-SPECTRUM.v1 · Date:

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Preliminary calculation tool. Results are for preliminary sizing and cross-check only. Final design, sealed responsibility, and permit submissions require the full official text of the referenced regulations and the review of a licensed engineer.