The effects of raised access flooring on the vibrational performance of long-span concrete floors.
The effects of raised access flooring on the vibrational performance of long-span concrete floors.
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高架活动地板对大跨度混凝土地板振动性能的影响。
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
P. Reynolds
中科院分区：
文献类型：
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作者：
P. Reynolds
目前的趋势是越来越细长的混凝土楼板结构，
导致它们的振动适用性更频繁地出现问题。预测
振动正常使用性的方法不仅要考虑结构本身，
而且还包括连接到它们的非结构元件，因为这些元件可能具有
对楼盖结构体系的动力特性影响显著。因为
过去在这方面的研究很少，本文描述了一个调查，
高架楼板对大跨度混凝土结构振动正常使用性能的影响
地板.
基于电动振动台的新型模态试验装置的研制
激励，这是能够产生高质量的估计模式
全尺寸地板结构的性能，描述。后来，它被用于
确定模态特性的三个全尺寸的地板结构，前后，
安装各种结构的高架通道地板。这些人的反应
还测量了结构对受控行人激励的响应。真实有限元
所有结构的模型都是使用
实验工作。这些后来被用于调查
实验测量的高架通道地板的影响。
结果发现，高架通道地板对结构的模态特性只有很小的影响，
大跨度的混凝土地板自然频率的降低是由于
质量，在某种程度上，抵消了刚度略有增加后，
安装入口地板。模态阻尼比增加的一些模式，
振动，但这些变化是相当不可预测的，因此他们也
在设计中使用不可靠。
结构在受控行人激励下的响应随
安装各种构造的高架通道地板。减少似乎
对于较深的通道地板（500 - 600 mm），
通道地板（150 - 200 mm）。因此，建议访问的影响
楼板可通过应用折减系数，
通过假设裸露地板计算的预测响应的系数。拟议
对于完工楼层高度小于
500 mm和0.8（对于完工楼层高度为500 mm或更高的通道楼层）。
There is a current trend towards ever more slender concrete floor structures, which is
resulting in more frequent problems with their vibration serviceability. Predictive
methods for vibration serviceability must consider not only the structures themselves,
but also the non-structural elements which are attached to them, as these may have a
significant effect on the dynamic characteristics of the floor structural system. As there
has been very little past research in this area, this thesis describes an investigation into
the effects of raised access floors on the vibration serviceability of long-span concrete
floors.
The development of a new modal testing facility based on electrodynamic shaker
excitation, which was capable of producing high quality estimates of the modal
properties of full-scale floor structures, is described. This was subsequently utilised to
determine the modal properties of three full-scale floor structures, before and after the
installation of various configurations of raised access floors. The response of these
structures to controlled pedestrian excitation was also measured. Realistic finite element
models of all structures were developed and updated using the results from the
experimental work. These were subsequently utilised for investigation of the
experimentally measured effects of the raised access floors.
It was found that raised access floors had only minor effects on the modal properties of
the long-span concrete floors. Reductions in natural frequencies due to the increased
mass were, to some extent, offset by the slight increases in stiffness following the
installation of the access floors. Modal damping ratios increased for some modes of
vibration, but these changes were rather unpredictable and hence they were too
unreliable to be used in design.
The response of the structures under controlled pedestrian excitation reduced following
the installation of various configurations of raised access floors. The reduction appeared
to be greater for relatively deep access floors (500 - 600 mm) than for relatively shallow
access floors (150 - 200 mm). Therefore, it is recommended that the effects of access
floors may be included in vibration serviceability analyses by applying a reduction
factor to predicted responses calculated by assuming a bare floor. The proposed
reduction factors are 0.9 for access floors where the finished floor height is less than
500 mm and 0.8 for access floors where the finished floor height is 500 mm or greater.