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Structural Concrete - Hassoun

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16.12 Rotation of Plastic Hinges 589<br />

Figure 16.28<br />

Curvature distribution along the plastic hinge.<br />

16.12.5 Rotation Capacity Provided<br />

Typical tensile plastic hinges at the support and midspan sections of a frame are shown in Fig. 16.29.<br />

The rotation capacity depends mainly on the following:<br />

1. The ultimate strain capacity of concrete, ε ′ c, which may be assumed to be 0.003 or 0.0035, as<br />

used by Baker [7].<br />

2. The length, l p , over which yielding occurs at the plastic hinge, which can be assumed to be<br />

approximately equal to the effective depth of the section where the plastic hinge developed<br />

(l p = d).

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