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ICONS
d b = Diameter of longitudinal reinforcement (average at tensile) [m]
L p = Plastic hinge length [m]
L s = Shear opening [m]
f co = Uncovered concrete compressive strength
f sy = Yield strength of reinforcement steel
f ck = Characteristic pressure of concrete strength
f yk = Characteristic yield strength of reinforcement steel
ϕ y = Yield curvature [m -1 ]
ϕ u = slump curvature [m -1]
θ p (GÖ)= allowable plastic rotation limit for Pre- migration performance level [rad]
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As seen in the picture above, the yield curvature ϕ y is the curvature that occurs when the tensile reinforcement flows in the section under the effect of bending moment. Immigration curvature φ u , crushing of concrete or plastic deformation of the section as a result of rupture of the reinforcement capability is calculated in the lost point where curvature. L p , plastic hinge length is calculated as half of the section height. L s is the cut clearance; It is taken as approximately half the span in columns and beams. d b is the average diameter of longitudinal rebars.
Stress-Strain Relations Curves for Concrete and Reinforcing SteelReinforcement Materials
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After the moment-curvature relationship is calculated, the stability curve of the plastic hinge is subtracted and then the rotation limits can be placed on this skeleton curve. The picture below shows a graph showing the moment-plastic rotation relationship. Plastic rotation limits for all performance levels are defined in this way and the damage status of the section is determined according to the plastic rotation result of the plastic joint.
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Stress-Strain Relations Curves for Concrete and Reinforcing SteelReinforcement Materials Since they take different values, the plastic hinge properties and plastic rotation limit values calculated in these approaches will also be different.
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The winding effect shown in Figure 5A.1 is calculated automatically according to the transverse reinforcement conditions of the section while calculating the moment-curvature relationship.
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