Joints Ductility (ASCE)

Adequate ductility should be possessed by both the structural elements and the structure as a whole according to section 18.7.3 of EN ACI 318-19. In frame buildings with two or more storeys, the following condition should be satisfied at all joints of primary or secondary seismic beams with primary seismic columns:

Where ΣMnc is the sum of the design values of the moments of resistance of the columns framing the joint and ΣMnb is the sum of the design values of the moments of resistance of the beams framing the joint.The joints ductility check is not employed for the joints of the top level of multistorey buildings according to section 18.7.3.1 of ACI 318-19.