Joints Ductility (NTC-18)

Adequate ductility should be possessed by both the structural elements and the structure as a whole according to section 7.4.4.2.1 of NTC-18. 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 γRd is taken according to table 7.2.I of NTC-18, ΣMc,Rd is the sum of the design values of the moments of resistance of the columns framing the joint and ΣMb,Rd is the sum of the design values of the moments of resistance of the beams framing the joint.