Design Considerations for Earthquake Forces - Simplified Design of Reinforced Concrete Buildings - page 293

Table 11-2 ACI Detailing Requirements for Seismic Design

Structural System Section

(a) Ordinary moment frames 21.2

(b) Ordinary RC structural walls N/A

(c) Intermediate moment frames 21.3

(d) Intermediate precast walls 21.4

(e) Special moment frames 21.1.3—21.1.7 & 21.5 21.8

(f) Special structural walls 21.1.3—21.1.7 & 21.9

(g) Special structural walls constructed using precast concrete 21.1.3—21.1.7 & 21.10

11.11 EXAMPLES

Two examples are provided to illustrate the application of the equivalent lateral force procedure. The two
examples provide design calculations for shearwalls (Example 1) and typical frame flexural member (Example
2). For comprehensive coverage for other seismic design requirements see Reference 11.3.

11.11.1 Example 1 - Building # 2 Alternate (2) Shearwalls

Seismic design data

Assuming that the building is located in the Midwest with the maximum considered earthquake spectral
response accelerations for short period (0.2 second) and one second period determined from IBC maps
(2009 IBC Figures 1613.5(1) through 1613.5(14)) as follows:

S S = 0.26 g
S 1 = 0.12 g

Soil site class definition is D

Occupancy category I