基于单振动台考虑行波效应的试验方法研究
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TU317+.1; TH69

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国家自然科学基金资助项目(51878529,52078386)


Experimental Method Considering Traveling Wave Effect Based on Single Shaking Table
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    摘要:

    提出一种利用常规单振动台考虑行波效应的试验方法。为了验证该试验方法的可行性,首先,将模型箱简化为通过弹簧、阻尼器连接的主动块和从动块,理论推导两质量块模型和三质量块模型的弹簧、阻尼参数的计算公式,并通过数值案例验证公式的准确性;其次,设计并实施两质量块和三质量块模型的小型单向振动台试验。试验结果表明,在简谐荷载激励下从动块加速度响应主频和时滞与目标值非常接近,表明通过弹簧阻尼器来实现行波效应的方法具有一定的可行性。该研究结果可为考虑行波效应的非一致振动试验提供参考。

    Abstract:

    Since most of the non-uniform shaking table tests use a multi-point shaking table array system, the seismic response of underground structures under non-uniform earthquakes is restricted by the conditions of the test equipment and it is difficult to carry out extensively. Therefor, an experiment technology by using conventional single shaking table to consider the traveling wave effect is proposed. In order to verify the feasibility of the test method, the model box is simplified into a driving block and a driven block connected by springs and dampers. The calculation formulas for the spring and damping parameters of the two-mass model and the three-mass model are theoretically deduced, and the accuracy of the formulas are verified through numerical cases, and then a series of small single shaking table test of the two-mass and three-mass model are designed and implemented. The experimental results show that the dominant frequency and time delay of the acceleration response of the driven block are very close to the target value under the excitation of simple harmonic load, which shows that the method of implementing the traveling wave effect through the spring damper is feasible. The research results can provide some reference to non-uniform shaking table test under traveling wave.

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  • 在线发布日期: 2022-05-06
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