软钢阻尼器基于Bouc-Wen模型的参数识别研究

摘要

软钢阻尼器构造简单,在工程中得到越来越多应用.Bouc -Wen模型是一个能很好地描述其力学特性的力学模型.但Bouc -Wen模型因其微分形式的非线性表达式而使得参数辨识存在较大的困难,而且其参数物理意义不明确.为此对Bouc -Wen模型各参数的物理意义进行了阐述,为进一步的理论分析和工程应用提供参考.结合Bouc-Wen特性,提出了Bouc -Wen模型的参数识别过程.利用软钢阻尼器的静力和动力试验结果,采用文中所提方法对其进行了参数识别研究.通过仿真结果与试验结果比较,证明提出的参数识别方法可以取得较好的识别效果.另外通过静力试验和动力试验结果对比分析,软钢阻尼器在动荷载下屈服力和刚度有较大提高,但对其动力模型需做进一步的研究.%Mild steel dampers are increasingly used in seismic design as its simple configuration. Its hysteretic behavior can be modeled properly by Bouc-Wen model. Since the differential expression of Bouc-Wen model, it is hard to identify the model' s parameters and to learn the model' s physical meaning. In this paper, the characteristics and physical meaning of Bouc-Wen model were illustrated. An identification procedure was proposed to identify the parameters. Static and dynamic tests were conducted on mild steel damper. By comparing the identified parameters from the static and dynamic tests, it was observed that the stiffness and the yield force of mild steel dampers are increased in dynamic load.