Rotational Spring Stiffness for Ultimate Limit State

Rotational spring stiffness for ultimate limit state

C_{φ, ULS} = K_{d} \cdot I_{p}

C_φ,ULS	Rotational spring stiffness for ultimate limit state
K_d	Design value of the modulus of displacement
I_p	Polar moment of inertia without component of fastener surfaces

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