TMD型防屈曲支撑构造及减振与抗震性能研究(Ⅱ)

为使防屈曲支撑功能实现复合化,设计并制作了一种具有调谐质量减振功能的防屈曲支撑(tuning mass dampered-buckling restrained brace,TMD-BRB).通过对6个动力试件的拟斜动试验和2个静力试件的滞回性能试验,考察了试件的复合减震功能,以及接触面做法、弹簧布置和套筒加长等几个关键技术对试件减震性能的影响,得出最优构造.试验结果表明:轮式-套筒加长型TMD-BRB,其TMD调谐精度高,动力系数大,周期特性明显;BRB性能方面,支撑在1/85支撑长度加载范围内滞回曲线稳定饱满,压拉比均值1.07,刚度退化和骨架曲线规律正常,30圈疲劳试验耗能下降10%,各项指标均满足国内外有关规定,且伴随钢芯变形能够实现TMD和BRB两种减震功能之间的自动切换.

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.