Input
Results
Ct—
Exponent x—
Approx. period Ta—
Cu (period coef.)—
T_max = Cu · Ta—
Use for design (≤ T_max)—
Method
Method A: Ta = Ct · hn^x (hn in meters; coefficients shown). Cu (ASCE 7 Table 12.8-1 / NSCP 208.5.2.2): SD1 ≥ 0.40 → 1.4; 0.30 → 1.4; 0.20 → 1.5; 0.15 → 1.6; ≤ 0.10 → 1.7. For analysis-derived T from rational analysis, used T but not greater than Cu · Ta for base-shear computation.