多阶段屈服及失效型金属套管阻尼器性能试验及分析

Experimental study and analysis on performance of metal tube damper with multi-stage yield and failure

针对传统金属阻尼器屈服性能单一的不足,提出一种由两种不同高宽比钢条作为耗能构件的金属套管阻尼器,其具有多阶段屈服和失效的特性。采用拟静力试验对其力学性能进行全面研究,验证该阻尼器的多阶段屈服与失效性能,揭示其破坏机制,研究其滞回性能、刚度退化性能和耗能能力,以及不同高宽比钢条分别采用低屈服点钢带来的影响。试验结果表明:该阻尼器具有多阶段屈服与破坏特性,且变形能力、耗能性能良好,阻尼器不同部位采用低屈服点钢可以实现不同的功能。建立该阻尼器的有限元模型,模拟结果与试验结果吻合较好,验证了有限元模型的正确性。最后,提出其关键性能参数的计算公式,验证三线性模型和Bouc-Wen模型表征该阻尼器的可行性。

To overcome the disadvantage of single yield performance of traditional metal damper, the metal tube damper with energy dissipation members composed of two steel strips with different aspect ratios was proposed, and it has the multi-stage yield and failure characteristics.The mechanical properties of the damper were studied based on quasi-static test, so that the multi-stage yield and failure performance of the metal tube damper was verified and its failure mechanism was revealed.Furthermore, the hysteretic behavior, stiffness degradation performance and energy dissipation capacity of the metal tube damper were investigated, and the influence of low yield point steel of steel strips with different aspect ratios was studied.The experimental results indicate that the damper has multi-stage yield and failure characteristics, good deformation capacity and energy dissipation performance.By applying low yield point steel to different parts of the damper, different functions can be realized.The finite element model of the damper was established, and then the simulation results were in good agreement with the experimental results, verifying the correctness of the finite element model.Finally, the calculation formulas of its key performance parameters were proposed, and the feasibility of the trilinear model and the Bouc-Wen model for characterizing the damper was validated.