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Structural Concrete - Hassoun

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826 Chapter 20 Seismic Design of Reinforced <strong>Concrete</strong> Structures<br />

Step 2.<br />

Step 3.<br />

Step 4.<br />

Step 5.<br />

Calculate the member forces, and use the different load combinations to determine the<br />

values of member forces that govern the design (Section 20.4). Design for flexural reinforcement.<br />

Check whether the frame member is a flexural member and check the general requirements<br />

for the special moment frame member according to Section 20.5.1.1.1.<br />

Check the special requirements for the longitudinal reinforcement according to Section<br />

20.5.1.1.2.<br />

Design the transverse reinforcement for confinement and shear resistant using Section<br />

20.5.1.1.3.<br />

Example 20.6<br />

Design a beam AB on the second floor of a building, as shown in Fig. 20.17. The building is constructed<br />

in a region of high seismic risk on soil class B. Additional information are:<br />

6 @ 12'<br />

A<br />

B<br />

30' 30'<br />

Figure 20.17<br />

Example 20.6: Building elevation.<br />

Material properties:<br />

Loads:<br />

Member dimensions<br />

<strong>Concrete</strong>: f c ′ = 4000 psi, w c = 150 pcf<br />

Steel f y = 60,000 psi<br />

Live loads = 40 psf<br />

Super imposed dead load = 35 psf<br />

Beams = 20 × 24 in.<br />

Columns = 20 × 24 in.<br />

Slab thickness = 7in.<br />

Effective depth = 21.5in.

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