Abstract

In this study, shaking table tests were performed on a 1/8-scaled test model equipped with and without a tuned mass damper (TMD) to validate the effectiveness of TMD on a transmission tower under seismic excitations and to investigate its damping mechanism. Based on the experimental results, the vibration control performance of TMD and the effects of earthquake characteristics were analysed. The results showed that TMD had efficient control effects on the transmission tower responses, but the control performance varied. Moreover, the vibration control performance was related to the earthquake types and decreased with the increase in excitation intensity. The vibration control performance along the height was also analysed comprehensively. Finally, the dynamic responses of the transmission tower model with TMD were simulated using the finite element software, ANSYS, which agreed well with the shaking table test results. Based on the finite element model, the effect of the damping ratio of TMD on the vibration control performance was determined through a parametric study, indicating that adding the damping ratio can improve the vibration control performance within a specific range. The experimental results and the numerical simulation method reported in this paper are applicable in transformation towers located in active seismic areas.

摘要

在这项研究中，在配备和不配备调谐质量阻尼器 (TMD) 的 1/8 比例测试模型上进行了振动台测试，以验证 TMD 在地震激励下对输电塔的有效性并研究其阻尼机制。基于试验结果，分析了TMD的振动控制性能和地震特性的影响。结果表明，TMD对输电塔响应具有有效的控制效果，但控制性能各不相同。此外，振动控制性能与地震类型有关，并随着激励强度的增加而降低。对沿高度的振动控制性能也进行了综合分析。最后，使用有限元软件ANSYS对具有TMD的输电塔模型的动力响应进行了模拟，与振动台试验结果吻合良好。基于有限元模型，通过参数研究确定了TMD阻尼比对振动控制性能的影响，表明在特定范围内增加阻尼比可以提高振动控制性能。本文报道的实验结果和数值模拟方法适用于位于地震活动区的变电塔。表明增加阻尼比可以提高特定范围内的振动控制性能。本文报道的实验结果和数值模拟方法适用于位于地震活动区的变电塔。表明增加阻尼比可以提高特定范围内的振动控制性能。本文报道的实验结果和数值模拟方法适用于位于地震活动区的变电塔。