No. 4 hoops with two legs provide Ash = 2 x 0.2 = 0.4 in.2 > 0.29 in.2 OK Confinement parallel to the wall.

With two hoops, Ash provided = 4 x 0.2 = 0.8 in2 > 0.7 in.2 OK

Figure 4.52 shows a schematic layout of reinforcement in wall pier W1. The analysis and design performed thus far does not consider post-elastic behavior of coupled walls, nor does it explain how a plastic analysis may be performed for seismic forces when the elements of the wall are yielding. This type of post-yield analysis is not required by ACI 318-02 but is recommended in the 1999 Blue Book, Recommended Lateral force Requirements and Commentary, published by the Structural Engineers Association of California (SEAOC). The designer is referred to Chapter 4 of this reference for further details.

A construction photograph of a diagonally reinforced coupling beam is shown in Fig. 4.52a.

Figure 4.52. Schematic reinforcement layout for wall pier, example 2.

Figure 4.52a. Construction photograph of a diagonally reinforced coupling beam. (Photo courtesy of Mr. Walter Steimle, John A. Martin and Assoc., Los Angeles, CA.)

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