Structural Concrete - Hassoun

850 Chapter 20 Seismic Design of Reinforced Concrete Structures
20.5.2.6 Summary: Design of Special Structural Wall
Step 1. Determine minimum reinforcement ratio according to Section 20.5.2.1 and design horizontal
and vertical reinforcement for the wall web.
Step 2. Check the shear strength of the wall according to Section 20.5.2.2.
Step 3. Design the wall for flexure and axial forces, assuming that the wall behaves as a column,
and include all reinforcement in the cross section of the wall and reinforcement in
boundary elements and the web in calculations (Section 20.5.2.3).
Step 4. Check whether the boundary elements need to be specially detailed according to Section
20.5.2.4. If conditions are satisfied, design the transverse reinforcement of boundary
elements by the provisions given for the special moment frame members subjected to
bending and axial forces.
Step 5. Design the coupling beams as shown in Section 20.5.2.5.
Example 20.8
Design the wall section given in Fig. 20.34 as a special structural wall.
Given: Forces are P u = 4000 K, M u = 45,000 kip ⋅ ft, V u = 900 K; boundary elements are 24 ×
24-in. columns; wall web thickness is 16 in.; wall length is 28 ft; wall height is 12 ft; normal-weight concrete
with f c ′ = 4000 psi; normal-weight concrete, and f y = 60,000 psi. Boundary elements are reinforced
with 16 no. 11 bars.
P u = 4000 K
M u
12 ft
V u = 900 K
24 in.
24 in. 24 in.
16 in.
24 in.
28 ft
Figure 20.34
Example 20.8: Structural wall.