E = Ω oQ E 0.2S DS D
(EQ. 4-6)
E = 3Q E 0.2(0.93)D
E = 3Q E 0.186D
B-10 Calculate combined load effects.
Load combinations per ANSI/ASCE 7-95 are as follows;
(1)
1.4D
(2)
1.2D+1.6L+0.5Lr
(3)
1.2D+0.5L+1.6Lr
(4)
1.2D+E+0.5L
(5)
0.9D+E
However, per Paragraph 4-6;
E = ρQE 6 0.2SDSD
= 1.0QE 6 0.2(0.93)D
= QE 6 0.186D
Therefore, Equations 4 and 5 become;
(4a) 1.386D+QE+0.5L
(5a) 0.714D+QE
B-11 Determine structural member sizes.
(1) Transverse shear wall design; use fc'= 4,000psi (27.58MPa), and fy = 60ksi (413.7MPa)
Per Paragraph 7-2.f. (1), shear walls will be designed in accordance with ACI 318-95 as modified by the
provisions given in Chapter 9 of FEMA 303.
Walls on grid lines 1 and 9;
Determine design loads;
The following diagram shows the maximum shear and overturning moment at each level;
1-ft = 0.30m, 1-kip = 4.448KN
H2-27
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