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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Apparent damping induced by spurious pitching in shaking-table testing
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Apparent damping induced by spurious pitching in shaking-table testing

机译：振动台测试中由虚假俯仰引起的表观阻尼

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摘要

A seismic shaking-table test performed on a one-storey steel frame with an 8 ton RC floor slab was reproduced on a similar specimen by means of the pseudo-dynamic (PsD) method. A satisfactory agreement of the results could only be achieved after recalibration of the theoretical mass in the PsD equation and proper inclusion in the PsD test input of the horizontal and pitching accelerations measured on the table. In the shaking-table test, the spurious pitching motion produced a significant increase in the apparent damping that could be estimated as a function of the pitching dynamic flexibility of the system. Dynamic and PsD snap-back tests were also performed to provide an additional check of the reliability of the PsD method. The spurious pitching motion of the shaking table should always be measured during the tests and reported as a mean to increase the reliability and usefulness of the results.
机译：通过拟动力（PsD）方法在类似的试样上复制了在具有8吨RC楼板的一层钢框架上进行的地震台试验。只有在重新校准PsD方程中的理论质量并将PsD测试输入中正确包含表上测量的水平和俯仰加速度后，才能获得令人满意的结果。在振动台测试中，虚假的俯仰运动会导致视在阻尼的显着增加，这可以根据系统的俯仰动态灵活性进行估算。还进行了动态和PsD骤回测试，以进一步检查PsD方法的可靠性。在测试过程中，应始终测量振动台的寄生俯仰运动，并将其报告为提高结果可靠性和实用性的一种手段。

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