How is the plastic torsion determined in the plastic hinge definition?


The plastic rotation is determined automatically for each hinge, based on the previously determined cross-section and the member length. For this, the following formula is used:

$\varphi_{y,pl}=\frac{W_{y,pl}\cdot f_y\cdot l_b}{6\cdot E\cdot I_y}$


FEMA Plastic hinge

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