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重载列车作用下桥墩-桩基竖向动荷载特性试验研究 被引量:2
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作者 郭风琪 王鹏蛟 +3 位作者 杨奇 余志武 冷伍明 陈琛 《土木工程学报》 EI CSCD 北大核心 2021年第11期79-90,共12页
为探明大轴重、长编组和高密度重载列车作用下桥墩和桩基承台顶的动荷载特性,开展不同车速和轴重条件下的桥墩-桩基体系竖向动荷载响应现场试验。分析桥墩动荷载曲线的时域、频域特征,采用Kolmogorov法对动荷载幅值进行正态性检验,建立... 为探明大轴重、长编组和高密度重载列车作用下桥墩和桩基承台顶的动荷载特性,开展不同车速和轴重条件下的桥墩-桩基体系竖向动荷载响应现场试验。分析桥墩动荷载曲线的时域、频域特征,采用Kolmogorov法对动荷载幅值进行正态性检验,建立列车参数与动荷载频域特征的联系;基于3σ原则对不同敞车作用下的动荷载特征值(均值、均幅值和均峰值)进行统计,结合实测数据建立重载列车作用下的墩顶动力系数计算公式,并提出墩顶和桩基承台顶的荷载谱公式及其参数取值。结果表明:动荷载响应在时域上可分为快速增加,周期波动和快速衰减3个阶段,在频域上服从倍频规律和幅值调制效应,0~5Hz频段激振对动荷载起控制作用;动荷载幅值服从正态分布,动荷载均峰值和振动能量沿墩身衰减明显,动荷载均值和均峰值随轴重增大而增大,均幅值随轴重的增加而减小;建议采用φ=1+0.0045v计算墩顶动力系数,采用三角级数式拟合桥墩荷载谱效果显著。研究成果可为重载列车作用下桩基的长期承载变形性状及环境振动评估的研究提供关键参数和可靠检验样本。 展开更多
关键词 重载铁路 桥墩-桩基 现场试验 动荷载特性 力系数 荷载
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An Experimental Study for Inverse Load Reconstruction 被引量:1
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作者 Bin Yang 《Journal of Energy and Power Engineering》 2012年第11期1826-1834,共9页
This paper performs an experimental study for inverse load reconstruction. By measuring and analyzing the load characteristics of different home and office electric devices, the author shows that a reconstruction of t... This paper performs an experimental study for inverse load reconstruction. By measuring and analyzing the load characteristics of different home and office electric devices, the author shows that a reconstruction of the individual power consumption of different loads from the total measurement of a single power meter is possible. 展开更多
关键词 Load measurement load analysis inverse load reconstruction NIALM.
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A Discussion on Dynamic Characteristics of Undisturbed Loess by Dynamic Triaxial Test
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作者 Zhang Lirong Shi Yucheng +1 位作者 Qiu Gongrong Liu Kun 《Earthquake Research in China》 2011年第3期352-357,共6页
Based on the dynamic triaxial test system and using the fitted wave of the Wenchuan earthquake and 1 Hz constant amplitude sinusoid,the paper compares the results of tests on undisturbed loess samples under different ... Based on the dynamic triaxial test system and using the fitted wave of the Wenchuan earthquake and 1 Hz constant amplitude sinusoid,the paper compares the results of tests on undisturbed loess samples under different loads and vibration modes but under same saturated conditions.Results of the comparative experiment show:The stress-strain curves have a similar trend under random seismic loading and constant amplitude sinusoidal loading,but the random seismic loading is more sensitive to failure strength of the undisturbed loess samples under the same stress. 展开更多
关键词 Dynamic triaxial test Wenchuan earthquake random wave Constantamplitude sinusoid Dynamic stress-strain curve
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