bars, with core dimensions measured to the outside of the transverse reinforcement not less than bw/2 and bw/5. It should be noted that, in practice, minimum required reinforcement clearance often controls the thickness of walls. Typically, a wall thickness of 16 in. or larger is required for the detailing of diagonally reinforced coupling beams.

The required area of longitudinal reinforcement Avd is calculated as follows:

2ffy sin a

This is the same as Eq. 21.9, written in a different form. An upper limit of lO^f Acp is imposed for the nominal capacity Vn = f . For the example problem, the upper limit is equal to

This is greater than the design value of Vu = 21O kips. OK

Referring to Fig. 4.47, we have tan a = h - ^sa^n• This is a transcendental equation, best solved by trial and error.

Try a = 30°. tan a = tan 30° = 0.577, cos 30° = 0.866

ln 72

tan a = tan 30° = 0.577. Compared to 0.50, this is not close enough. Try a = 28°, tan 28° = 0.552, cos 28° = 0.883

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