Special Truss Moment Frame Component Test 11 - 2C6x13

Specimen 11, made of double channels, 2C6x13, was tested under cyclic loading. The test setup represents the intermediate vertical members in the special segment of a prototype STMF. The specimen was welded to a gusset plate and the 2C12x20.7 column that resembles the chord members of the STMF. The weld length between the gusset plate and the specimen was 6 in. while the weld free length was 4 in. Based on the good result of the connection detailing in experiment 10, 2 pairs of 0.25 in.-thick stiffeners and one pair of horizontal stitches were used here. Even though 2HSS6x13 could only sustain strength up to 1.5% story drift, its hysteretic behavior was still stable and ductile considering that the member rotation of approximately 6% was achieved. Loss of strength seemed to be caused by fracture and flange local buckling since large bulging of the web was not observed.