套索式黏滞阻尼器位移放大系数的理论和实验研究

The theoretical and experimental research on the displacement magnification coefficient in Toggle-Brace-System

考虑了支撑杆弹性变形的影响,提出了精确计算套索式黏滞阻尼器位移放大系数的方法;借助SAP2000分析软件,研究了套索式黏滞阻尼器在不同工况下放大系数的变化情况,并通过试验对理论分析和模拟结果进行了验证。研究结果表明:套索式黏滞阻尼器的实际位移放大系数小于刚性理论计算值,支撑杆的弹性变形应予以考虑;在其他条件一定的情况下,位移放大系数随加载频率的增大而减小。本文提出的方法考虑了支撑杆件的刚度,能够更加合理地计算套索式黏滞阻尼器的位移放大系数。

It is common that the brace in the Toggle-Brace-System is usually regarded as a rigid rod when calculating the displacement amplification factor in the existing theoretical methods. However, this methodology ignoring the influence of the elastic deformation of the brace, may induce some inevitable errors. In order to overcome this limitation, a numerical method to exactly calculate the displacement amplification factor is proposed in this paper, in which the impact of elastic deformation of brace is taken into account. With the aid of SAP2000 software, the amplification factor variation of Toggle-Brace-System under different working cases are investigated systematically and an experiment is designed and carried out to verify and validate the numerical results. The results show that the actual displacement amplification factor of the Toggle-Brace-System is smaller than the theoretical calculation based on infinite stiffness and the elastic deformation of the brace should be considered. In the case where the other conditions are the same, the displacement amplification factor decreases as the loading frequency increases. The method proposed in this paper considers the stiffness of the brace and can more reasonably calculate the displacement amplification factor of the Toggle-Brace-System.