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Test results revealed that both specimens failed by brittle fracture of complete joint penetration (CJP) welds between the beam flange and the column during a story drift angle of less than 1% rad, which resulted in no plastic rotation in the connections.
A story drift angle of 4% rad was used to compare the connection behaviors under highly strained states because a special moment-resisting frame is assumed to be capable of sustaining a story drift angle of at least 4% rad [20].
The moment at the column face versus story drift angle (θ) relationship for model LF30-T is shown in Figure 14.
Story drift angle is computed by dividing the total beam tip displacement by the distance from the beam tip to the column centerline.
Local buckling of the beam flanges was noticed in the cycles with 4% rad story drift angle.
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