The lateral seismic force at any level is determined as = (Eq. 12.8-11) Fx CvxV Where (Eq. 12.8-12) For 0.5 sec., = 1.0 T k ≤ Force distribution along the height of the building is shown in the table below Level wx hx wxhxk Cvx Fx (kips) (ft) (ft-kips) (kips) x 3 214 31 6634 0.53 53.4 2 220 18 3960 0.31 31.4 1 220 9 1980 0.16 16.2 654 12,574 1.00 101 ∑ 1.0 kip = 4.45 kN, 1.0 ft = 0.3048 m, 1.0 ft-kip = 1.36 kN-m Strength level diaphragm design force: Diaphragm design force is given by the larger of determined above and determined below. Fx Fpx (Eq. 12.10-1) Strength level diaphragm forces are determined in the table below. wpx Fpx (kips) (kips) wi Fi Level (kips) (kips) (kips) (kips) Trans. Long. Trans. Long. Roof 214 214 53.4 53.4 194.1 175.6 48.4 43.8 2 220 434 31.4 84.8 180.2 143.2 35.2 28.0 1 220 654 16.2 101 180.2 143.2 27.8 22.0 1.0 kip = 4.45 kN. at roof cannot be less than: Fpx = 0.2SDSIewpr (Eq. 12.10-2) Fpr = 0.2(1.0)(1.0)(194.1) = 38.8 kips (transverse direction) = 0.2(1.0)(1.0)(175.6) = 35.1 kips (longitudinal direction) at the floor levels cannot be less than: Fpx 0.2SDSIewpx (Eq. 12.10-2) Fpx=
The lateral seismic force at any level is determined as Fx = CvxV (Eq. 12.8-11) Where (Eq. 12.8-12) For T ≤ 0.5 sec., k = 1.0 Force distribution along the height of the building is shown in the table below Level x wx (kips) hx (ft) wxhxk (ft-kips) Cvx Fx (kips) 3 2 1 ∑ 214 220 220 654 31 18 9 6634 3960 1980 12,574 0.53 0.31 0.16 1.00 53.4 31.4 16.2 101 1.0 kip = 4.45 kN, 1.0 ft = 0.3048 m, 1.0 ft-kip = 1.36 kN-m Strength level diaphragm design force: Diaphragm design force is given by the larger of Fx determined above and Fpx determined below. (Eq. 12.10-1) Strength level diaphragm forces are determined in the table below. Level wi (kips) (kips) Fi (kips) (kips) wpx (kips) Fpx (kips) Trans. Long. Trans. Long. Roof 214 214 53.4 53.4 194.1 175.6 48.4 43.8 2 220 434 31.4 84.8 180.2 143.2 35.2 28.0 1 220 654 16.2 101 180.2 143.2 27.8 22.0 1.0 kip = 4.45 kN. Fpx at roof cannot be less than: Fpr = 0.2SDSIewpr (Eq. 12.10-2) = 0.2(1.0)(1.0)(194.1) = 38.8 kips (transverse direction) = 0.2(1.0)(1.0)(175.6) = 35.1 kips (longitudinal direction) Fpx at the floor levels cannot be less than: Fpx= 0.2SDSIewpx (Eq. 12.10-2)