为研究地震作用下硬管母线连接特高压电气设备之间的动力相互作用,进行了由硬管母线连接的1 000 k V避雷器和电容电压式互感器（CVT）组成的互连耦合结构体系的振动台试验。通过白噪声扫频和抗震试验,测定了设备频率以及关键部位的位移...为研究地震作用下硬管母线连接特高压电气设备之间的动力相互作用,进行了由硬管母线连接的1 000 k V避雷器和电容电压式互感器（CVT）组成的互连耦合结构体系的振动台试验。通过白噪声扫频和抗震试验,测定了设备频率以及关键部位的位移、应变和加速度响应。对比分析等效单体设备与互连耦合结构的地震响应,获得了硬管母线对电气设备地震响应的影响规律。结果表明：与等效单体设备相比,互连耦合结构的设备频率、位移和应变响应均有所降低,可采用在单体设备顶端施加配重的方式来等效简化互连耦合结构;由于硬管母线和滑动金具阻尼耗能的影响,高频互感器设备的地震响应降幅较大,其频率和应变响应的降幅均为21%。互连耦合结构在双向激励下的设备地震响应与单向激励时相比有所放大,放大倍数在1.19~1.22之间。展开更多
This paper describes a shake table test study on the seismic response of low-cap pile groups and a bridge structure in liquefiable ground. The soil profile, contained in a large-scale laminar shear box, consisted of a...This paper describes a shake table test study on the seismic response of low-cap pile groups and a bridge structure in liquefiable ground. The soil profile, contained in a large-scale laminar shear box, consisted of a horizontally saturated sand layer overlaid with a silty clay layer, with the simulated low-cap pile groups embedded. The container was excited in three E1 Centro earthquake events of different levels. Test results indicate that excessive pore pressure （EPP） during slight shaking only slightly accumulated, and the accumulation mainly occurred during strong shaking. The EPP was gradually enhanced as the amplitude and duration of the input acceleration increased. The acceleration response of the sand was remarkably influenced by soil liquefaction. As soil liquefaction occurred, the peak sand displacement gradually lagged behind the input acceleration; meanwhile, the sand displacement exhibited an increasing effect on the bending moment of the pile, and acceleration responses of the pile and the sand layer gradually changed from decreasing to increasing in the vertical direction from the bottom to the top. A jump variation of the bending moment on the pile was observed near the soil interface in all three input earthquake events. It is thought that the shake table tests could provide the groundwork for further seismic performance studies of low-cap pile groups used in bridges located on liquefiable groun.展开更多
Severe damage to suspended ceilings of metal grids and lay-in panels was observed in public buildings during the 2013 M7.0 Lushan earthquake in China. Over the past several years, suspended ceilings have been widely u...Severe damage to suspended ceilings of metal grids and lay-in panels was observed in public buildings during the 2013 M7.0 Lushan earthquake in China. Over the past several years, suspended ceilings have been widely used practice in public buildings throughout China, including government offices, schools and hospitals. To investigate the damage mechanism of suspended ceilings, a series of three-dimensional shake table tests was conducted to reproduce the observed damage. A full-scale reinforced concrete frame was constructed as the testing frame for the ceiling, which was single-story and infilled with brick masonry walls to represent the local construction of low-rise buildings. In general, the ceiling in the tests exhibited similar damage phenomena as the field observations, such as higher vulnerability of perimeter elements and extensive damage to the cross runners. However, it exhibited lower fragility in terms of peak ground/roof accelerations at the initiation of damage. Further investigations are needed to clarify the reasons for this behavior.展开更多
文摘为研究地震作用下硬管母线连接特高压电气设备之间的动力相互作用,进行了由硬管母线连接的1 000 k V避雷器和电容电压式互感器（CVT）组成的互连耦合结构体系的振动台试验。通过白噪声扫频和抗震试验,测定了设备频率以及关键部位的位移、应变和加速度响应。对比分析等效单体设备与互连耦合结构的地震响应,获得了硬管母线对电气设备地震响应的影响规律。结果表明：与等效单体设备相比,互连耦合结构的设备频率、位移和应变响应均有所降低,可采用在单体设备顶端施加配重的方式来等效简化互连耦合结构;由于硬管母线和滑动金具阻尼耗能的影响,高频互感器设备的地震响应降幅较大,其频率和应变响应的降幅均为21%。互连耦合结构在双向激励下的设备地震响应与单向激励时相比有所放大,放大倍数在1.19~1.22之间。
基金Major Research Plan of National Natural Science Foundation of China Under Grant No.90815009National Natural Science Foundation of China Under Grant No.50378031 and 50178027Western Transport Construction Technology Projects Under Grant No.2009318000100
文摘This paper describes a shake table test study on the seismic response of low-cap pile groups and a bridge structure in liquefiable ground. The soil profile, contained in a large-scale laminar shear box, consisted of a horizontally saturated sand layer overlaid with a silty clay layer, with the simulated low-cap pile groups embedded. The container was excited in three E1 Centro earthquake events of different levels. Test results indicate that excessive pore pressure （EPP） during slight shaking only slightly accumulated, and the accumulation mainly occurred during strong shaking. The EPP was gradually enhanced as the amplitude and duration of the input acceleration increased. The acceleration response of the sand was remarkably influenced by soil liquefaction. As soil liquefaction occurred, the peak sand displacement gradually lagged behind the input acceleration; meanwhile, the sand displacement exhibited an increasing effect on the bending moment of the pile, and acceleration responses of the pile and the sand layer gradually changed from decreasing to increasing in the vertical direction from the bottom to the top. A jump variation of the bending moment on the pile was observed near the soil interface in all three input earthquake events. It is thought that the shake table tests could provide the groundwork for further seismic performance studies of low-cap pile groups used in bridges located on liquefiable groun.
基金Research fund for earthquake engineering of China Earthquake Administration(201508023)a project of the National Science&Technology Support Program during the Twelfth Five-year Plan Period of China(2015BAK17B03)a general program of National Natural Science Foundation of China(51578515)
文摘Severe damage to suspended ceilings of metal grids and lay-in panels was observed in public buildings during the 2013 M7.0 Lushan earthquake in China. Over the past several years, suspended ceilings have been widely used practice in public buildings throughout China, including government offices, schools and hospitals. To investigate the damage mechanism of suspended ceilings, a series of three-dimensional shake table tests was conducted to reproduce the observed damage. A full-scale reinforced concrete frame was constructed as the testing frame for the ceiling, which was single-story and infilled with brick masonry walls to represent the local construction of low-rise buildings. In general, the ceiling in the tests exhibited similar damage phenomena as the field observations, such as higher vulnerability of perimeter elements and extensive damage to the cross runners. However, it exhibited lower fragility in terms of peak ground/roof accelerations at the initiation of damage. Further investigations are needed to clarify the reasons for this behavior.
