开槽U型金属屈服阻尼器横向性能试验研究

发布时间：2018-08-07 13:25

【摘要】：在隔震层安装金属屈服阻尼器可以有效控制隔震层在地震下的位移。由于隔震层在地震下产生多向变形,因此要求安装在隔震层中的金属屈服阻尼器需具有多向的变形能力。既往研究表明U型金属屈服阻尼器在面内具有良好的耗能能力,对于提高结构阻尼比,控制隔震结构的位移具有非常显著的作用。然而关于其面外性能的深入研究尚未见报道。提出了开槽U型阻尼器以提高其面外性能,并通过拟静力试验考察了阻尼器宽度,高度,以及长度对其面外性能的影响,实验表明合理设计的开槽U型阻尼器具有良好的耗能能力和低周疲劳性能。同时采用有限元方法补充了试件的数量,进行了参数分析。根据参数分析的结果提出了开槽型U型金属屈服阻尼器的屈服位移,屈服恢复力设计公式。另一方面,根据虚功原理提出了开槽U型阻尼器的极限恢复力计算公式,并通过试验结果与有限元模型的计算结果校对了该公式的精度和适用范围。
[Abstract]:Metal yield damper can effectively control the displacement of isolation layer under earthquake. Due to the multidirectional deformation of the isolation layer under the earthquake, the metal yield damper installed in the isolation layer is required to have multi-directional deformation ability. Previous studies show that U-type metal yield dampers have a good energy dissipation capacity in the plane and play an important role in improving the damping ratio of structures and controlling the displacement of isolated structures. However, the further study of its out-of-plane performance has not been reported. A grooved U-damper is proposed to improve its out-of-plane performance, and the effects of the width, height and length of the damper on its out-of-plane performance are investigated by quasi-static test. The experiments show that the slotted U-damper has good energy dissipation capacity and low cycle fatigue performance. At the same time, the finite element method is used to supplement the number of specimens, and the parameter analysis is carried out. Based on the results of parameter analysis, a formula for designing yield displacement and yield restoring force of grooved U-type yield damper is presented. On the other hand, according to the principle of virtual work, a formula for calculating the ultimate restoring force of slotted U-damper is proposed, and the accuracy and application range of the formula are verified by the experimental results and the results of the finite element model.
【作者单位】：清华大学土木工程安全与耐久教育部重点试验室;北京羿射旭科技有限公司;
【基金】：国家自然科学基金(51178250,51422809) 清华大学自主科研项目(2014Z22067)
【分类号】：TU352.12

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