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根据地面运动强度和频率特性以及粘滞型阻尼器的参数,比较了具有或没有粘滞型阻尼器的人字型支撑的钢框架的抗震性能。对于单层和多层设有和没有粘滞型阻尼器的人字型支撑的钢框架,进行了包括小、中等、高强度各种频率特性的地面运动的非线性时间序列分析。以单层和多层带有粘滞型阻尼器的人字型支撑的钢框架的非线性时间序列分析为基础,研究了粘滞型阻尼器的减幅率和速度指数对框架的抗震性能的作用。研究结果显示,没有粘滞型阻尼器的人字型支撑的钢框架的抗震性能低,由于支撑失稳的影响,对频率和地面运动的强度敏感。而安装粘滞型阻尼器后,由于其维持了这种结构的弹性,极大提高了它的抗震性能。此外,小速率指数和大减幅比率的粘滞型阻尼器在提高带有人字型支撑的钢框架的抗震性能上更有效,然而,减幅比率大于50%的粘滞型阻尼器,在人字型支撑的钢框架的抗震性能上没有更多的改善。
The seismic performance of steel frames with herringbone braces with or without viscous dampers was compared according to the strength and frequency characteristics of the ground and the viscous damper parameters. Nonlinear time series analysis of ground motions involving various frequency characteristics of small, medium and high intensity is performed for single and multiple herringbone supported steel frames with and without viscous dampers. Based on the nonlinear time series analysis of single-layer and multi-layer herringbone supported steel frames with viscous dampers, the effects of the damping rate and velocity index of viscous dampers on the seismic performance of frame effect. The results show that the herringbone supported steel frame without viscous damper has low seismic performance and is sensitive to the frequency and the intensity of ground motion due to the support instability. The installation of viscous damper, because it maintains the flexibility of this structure, greatly improving its seismic performance. In addition, viscous dampers with a small rate index and a large reduction ratio are more effective at improving the seismic performance of steel frames with herringbone braces. However, viscous dampers with a reduction ratio greater than 50% There is no more improvement in the seismic performance of the framed steel frame.