Yield rotation value for shear walls is calculated according to TBDY 15A.4 using the moment-curvature relation for linear performance analysis . Moment-curvature analysis is done by considering the information level coefficient and the existing material strengths.
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ICONS
E = Concrete modulus of elasticity
I = Moment of inertia
L p = Plastic hinge length
l c = Element net opening
M y = Effective yield moment
ϕ y = Yield curvature
ϕ t = Total curvature
θ p = Demand for plastic rotation
θ y = Flow rotation
θ yi = flow rotation at end i
θ k = Displaced axis rotation
θ ki = displaced axis rotation at end i
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In these equations, M y is the effective yield moment of curtain . The M y value is calculated with the information level coefficient and the moment-curvature relationship calculated according to the material models and reinforcement placement, which are created considering the existing material strengths . In reinforced concrete walls with cross-section shape I, T, L, U or C, the resultant of the finite element joint forces are obtained as equivalent rod section effects at the cross-section gravity center, based on the reinforced concrete section calculation. Similarly, in reinforced concrete walls with cross-sectional shape I, T, L, U or C from the center of cross-section gravity, the effective yield moment M y is found as a result of the moment curvature analysis as shown below.
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