防屈曲钢支撑阻尼器的试验研究

An experimental study of anti-buckling steel damping-braces

对7个一字形内芯外包钢管的防屈曲钢支撑阻尼器进行静力往复试验和子结构拟动力试验研究。在静力往复试验中根据试件的破坏特征不断完善其构造措施以确定其合理构造,并研究合理构造的防屈曲钢支撑阻尼器的滞回性能。静力往复试验结果表明这类防屈曲钢支撑阻尼器具有很好的滞回特性和耗能性能。为研究装有防屈曲钢支撑阻尼器的框架在地震作用下的动力反应,对一个单自由度框架结构进行子结构拟动力试验。子结构拟动力试验表明地震作用下钢支撑阻尼器结构的抗震能力得到了很大的提高,有效地降低结构的最大位移。用ANSYS软件计算得到的和试验得到的钢支撑阻尼器结构的地震反应吻合得很好,说明ANSYS计算时所用的阻尼器恢复力模型及参数的确定是合理的。

Static cyclic tests and substructure pseudo-dynamic tests were conducted on seven steel buckling-restrained braces （BRBs） , each consisting of a flat steel bar encased in a square steel tube. Compositions of the braces were improved one by one, according to the failure models observed in the static cyclic tests, to determine the rational composition and to investigate its hysteretic characteristics. The test results demonstrate a stable hysteretic behavior and a substantial energy absorption capacity of the brace. In order to study the response of structures with steel BRBs, substructure pseudo-dynamic tests were performed on frame with a single degree of freedom （SDOF） The steel BRBs, in the substructure pseudo-dynamic tests, significantly suppress the seismic response of the structure by dissipating most of the vibration energy through inelastic deformation. The structural responses calculated by using the ANSYS software are similar to those from the tests, which demonstrate the validity of the model and parameters of the brace.