| 王海波,李春雷,张昆航.U形渡槽内水体液面晃动对流作用试验研究[J].水利学报,2020,51(12):1453-1461 |
| U形渡槽内水体液面晃动对流作用试验研究 |
| Experimental study on the convective mass of sloshing liquid in a U-shaped aqueduct |
| 投稿时间：2020-06-02 |
| DOI：10.13243/j.cnki.slxb.20200390 |
| 中文关键词: U形薄壁渡槽 自振频率 阻尼比 对流作用 振动台试验 |
| 英文关键词: U-shaped aqueduct eigen-frequency damping ratio convective mass shaking table test |
| 基金项目:国家重点研发计划项目（2016YFC0401807） |
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| 中文摘要: |
| 大型U形渡槽多为薄壁结构，柔性结构与水体间的动力相互作用与刚性壁假定存在明显的不同，渡槽类结构刚度对两类等效质量的影响尚需深入研究。本研究采用几何比尺1/10的大型薄壁U形渡槽物理模型，通过振动台试验研究U形渡槽与水体的动力相互作用。通过深入分析稳态白噪声激励下渡槽结构的动态响应及槽内水体液面自由晃动结构响应，确定U形渡槽中水体液面晃动的自振频率及阻尼比，并通过深入分析试验记录的液面晃动波高幅值与渡槽支座力、弯矩幅值，定量给出了试验对象U形渡槽结构槽内水体对流作用的等效质量及作用位置。可为实际U形渡槽工程抗震设计准确分析及安全性评价提供可靠依据。 |
| 英文摘要: |
| The dynamic interaction between structure and water is the critical problem in numerical procedure for the estimation of seismic responses and safety verification of aqueducts. Most of large U-shaped aqueducts,however,are thin wall structure,evidently different to rigid wall. Therefore,it is necessary to investigate the influence of the stiffness of aqueducts on the mechanical analogue. A physical model of 1/10 in geometrical scale, representing a large thin wall U-shaped aqueduct, was used in our research to study the aqueduct and water interaction on a shaking table. With the analyses of the aqueduct responses to stationary white noise excitations as well as the free surface motion of water post non-stationary excitations, sloshing frequencies and damping ratio related were determined. Furthermore, the convective mass and its position of the U-shaped aqueduct were worked out quantitatively with the wave height, horizontal forces and moments measured. These results can provide reliable basis for the numerical analysis procedure as well as the seismic verification of U-shaped aqueduct. |
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