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FAQ
What is the difference between Caltrans hinge and fiber hinge?
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The fiber hinge uses multiple axial stress-strain curves. It is more "realistic". Each fiber has its own hysteresis behavior, so it can track any PMM variation. It is computationally more intensive.
How exactly is ICrack determined for Caltrans hinges?
Extended question: It is not clear how exactly is the ICrack determined. Is it the "traditional" Icr that neglects the contribution of concrete in tension that would be calculated at Mcr?
Answer: "Icr" represents the cracked moment of inertia and is calculated from the basic principles as follows:
Icr = Mp / (Cp * E)
where, Cp = (Cy * Mp)/ My
Mp = Plastic moment (idealized)
Cp = Plastic curvarure
E = Modulus of elasticity
Cy = Yield curvature
My = Yield moment