Structure and Vibration-reduction Study on Tuning Mass Dampered-buckling Restrained Brace (Ⅱ)

In order to implement the composite function of BRB, a new type of buckling-restrained brace with tuning mass damper function (TMD-BRB) was designed and constructed. The composite function of vibration reduction and effect by contact surface craft, springs form and extension of tube in end-range place, were investigated by six dynamic and two static specimens. An optimal structure plan was obtained by contrast. Tests show that the wheel-tube with long making type TMD-BRB had an ideal tuning precision, a high dynamic coefficient and an obvious period performance of vibration. For its BRB performance, the specimen had a stable and plump hysteretic curve in 1/85 brace length. Various indexes, including 1.07 tension-compression ratio, normal stiffness deterioration and skeleton curve, 10% energy consumption attenuation by 30 circles fatigue test, was accorded with the international regulations. The mechanical structure could also reach a constructional balance between the two composite vibration reduction functions with an automatic shift from TMD to BRB in earthquake.