形状记忆合金－摩擦串联复合阻尼器对偏心结构振动控制的研究

摘要

采用自行研制的SMA－摩擦串联复合阻尼器控制偏心结构的平扭耦联振动。SMA－摩擦串联复合阻尼器能根据结构的地震响应自动调节耗能单元工作状态，且构造简单、经济实用。建立了SMA－摩擦串联复合阻尼器控制下偏心结构在双向水平地震作用下的运动方程，并编写程序计算结构的时程响应。以一六层剪切型偏心钢框架为例，计算结果表明：合理布置的阻尼器能有效抑制结构质心位移和质心层间位移，且对扭转振动的控制效果更佳；阻尼器对结构质心平移加速度的影响不大，但显著改变了扭转加速度。%Self-made shape memory alloy (SMA)-friction tandem dampers were used to control the translational-torsional coupled vibration of an eccentric structure.The SMA-friction tandem damper could adjust the working status of energy consumption elements automatically according to seismic responses of the structure,and had advantages of simple structure and small cost.The motion equations of the eccentric structure with the SMA-friction tandem dampers subjected to the bidirectional horizontal seismic actions were established,and the time history responses of the structure were computed with a procedure programmed.Taking a six-story shear-type eccentric steel frame as an example,the numerical results showed that the dampers deployed on the structure reasonably can attenuate the displacements and the inter-story displacements of the mass center of the structure,their control effects on torsional vibrations are better;their control effects on the translational accelerations of the mass center of the structure are slight,but they change the torsional aeeclerations obviously.