This paper aims to investigate the seismic motion characteristics of bedrock and overburden layer slope with the prototype model taken from slopes in the Zheduo Mountain in Northwest Plateau of Sichuan Province,China....This paper aims to investigate the seismic motion characteristics of bedrock and overburden layer slope with the prototype model taken from slopes in the Zheduo Mountain in Northwest Plateau of Sichuan Province,China.Based on dimensional analysis and similarity principle,two model tests with different slope angles were carried out.A transfer function analysis method was proposed to interpret the results from shaking table tests.After eliminating trend terms and signal filtering,the time-domain acceleration was transformed into frequency domain.Then the transfer function was calculated by an average periodic chart.The variation of transfer function from different positions was analyzed by Pearson correlation coefficient,and the least square iteration method was used for modal analysis.The effect of seismic intensity on the dynamic response was highlighted.It is found that the transfer function obviously changes when the slopes are destroyed.Results from modal analysis show that the natural frequency decreases with the increase of the excitation intensity,and the damping ratio increases due to slope damage.展开更多
通过对420 k V避雷器设备进行模拟振动台抗震试验,对其抗震性能提出评价。首先利用白噪声激励扫频得到实际设备的自振频率,进而分析结构的动力特性,同时对设备分别输入EL Centro波、汶川波和人工波,测定模型在不同地震作用下关键部位加...通过对420 k V避雷器设备进行模拟振动台抗震试验,对其抗震性能提出评价。首先利用白噪声激励扫频得到实际设备的自振频率,进而分析结构的动力特性,同时对设备分别输入EL Centro波、汶川波和人工波,测定模型在不同地震作用下关键部位加速度、应变等主要参数,考核设备的抗震性能以及支架与上部设备的连接受力性能。试验结果表明,在不同的地震波作用下,输入不同地震波加速度峰值时,420 k V避雷器设备无结构损伤,具有一定的抗震能力,为后期评定避雷器设备的抗震性能提供一定的理论参考。展开更多
基金financially supported by National Natural Science Foundation of China(No.52078426)National Key Research and Development Plan(Grant No.2018YFE0207100)Sichuan Provincial Science and Technology Support Project(Grant No.2020YJ0253,c)。
文摘This paper aims to investigate the seismic motion characteristics of bedrock and overburden layer slope with the prototype model taken from slopes in the Zheduo Mountain in Northwest Plateau of Sichuan Province,China.Based on dimensional analysis and similarity principle,two model tests with different slope angles were carried out.A transfer function analysis method was proposed to interpret the results from shaking table tests.After eliminating trend terms and signal filtering,the time-domain acceleration was transformed into frequency domain.Then the transfer function was calculated by an average periodic chart.The variation of transfer function from different positions was analyzed by Pearson correlation coefficient,and the least square iteration method was used for modal analysis.The effect of seismic intensity on the dynamic response was highlighted.It is found that the transfer function obviously changes when the slopes are destroyed.Results from modal analysis show that the natural frequency decreases with the increase of the excitation intensity,and the damping ratio increases due to slope damage.
文摘通过对420 k V避雷器设备进行模拟振动台抗震试验,对其抗震性能提出评价。首先利用白噪声激励扫频得到实际设备的自振频率,进而分析结构的动力特性,同时对设备分别输入EL Centro波、汶川波和人工波,测定模型在不同地震作用下关键部位加速度、应变等主要参数,考核设备的抗震性能以及支架与上部设备的连接受力性能。试验结果表明,在不同的地震波作用下,输入不同地震波加速度峰值时,420 k V避雷器设备无结构损伤,具有一定的抗震能力,为后期评定避雷器设备的抗震性能提供一定的理论参考。
