Simplified Design for Columns - Simplified Design of Reinforced Concrete Buildings - page 178

(b) Factored moments in 1st story edge columns:

gravity loads: M u = 327.6 ft-kips (see Section 3.8.3 - Step (2), M u @ exterior columns) portion of M u to 1st
story column = 327.6/2 = 164 ft-kips

wind loads (see Fig. 2-13):

P = 10.91 kips

M = 61.53 ft-kips

(2) LOAD COMBINATIONS

For the 1st story column:

gravity loads:

P u = 268 kips ACI Eq. (9-2)

M u = 164 ft-kips

gravity + wind loads:

P u = 1.2(176) + 0.8(10.91) = 220 kips ACI Eq. (9-3)

M u = 1.2(99.5) + 0.8(61.53) = 169 ft-kips

or

P u = 1.2(176) + 0.50(35.1) + 1.6(10.91) = 247 kips ACI Eq. (9-4)

M u = 1.2(99.5) + 0.50(27.7) + 1.6(61.53) = 232 ft-kips

or

P u = 0.9(176) + 1.6(10.91) = 176 kips ACI Eq. (9-6)

M u = 0.9(99.5) + 1.6(61.53) = 188 ft-kips

Factored loads and moments, and load combinations, for the 2nd and 3rd story columns are calculated in a sim-
ilar manner, and are summarized in Table 5-11.