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

Integrated Publishing, Inc. |