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Vibrations of Cross-Laminated Timber Floors

机译：交叉层压木材地板的振动

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This paper investigates the vibrations caused by human action of five-layer cross-laminated timber panels with a height of 14 cm. Analysis is made of three floor panels of identical height, but with different combinations of thicknesses of the laminas in cross-layers, varying their spans. The longitudinal layers of the panels have better physical and mechanical characteristics than transverse layers. The relevant criteria to be observed in floor construction at the designing stage are specified in order to ensure acceptable behavior regarding the dynamic load. Limit values are also given. As it is very difficult to determine the threshold of human acceptability, since vibrations that someone finds disturbing do not have to be disturbing for others, the relevant criteria used in the work has been chosen on the basis of the highest representation in the literature: Natural Frequency Limit, Unit Load Deflection Limit and the Combined Criterion. Calculation of the effective bending stiffness of the panel was performed using Gamma method, K-method and Kreuzinger analogy. The natural frequency of each panel was determined analytically, and so was the maximum deflection due to unit static force and the obtained results were compared with the values obtained by modal and static analysis in the Ansys software package. All the obtained data were compared with the valid criteria, and panels that meet the criteria in terms of the serviceability limit state were selected. The results showed that the analyzed floor panels of the span up to 4.5 m are acceptable in terms of adequate dynamic behavior related to human action according to all criteria. Also, the results showed that the Combined Criterion and the Unit Load Deflection Limit are significantly stricter due to the unit static force compared to the Natural Frequency Limit. If the minimum required natural frequency of the CLT panel were accepted with a value of 8 Hz, which corresponds to the milder recommendations in the available literature, the spans could go up to 6 m. On the basis of the obtained results, it can be concluded that in the design of floor structures, in addition to static stability, an adequate dynamic response to the initiative caused by everyday human activities must be provided. The results also show that the analyzed floor CLT panels can be very successfully applied in the floor constructions of residential and commercial buildings, provided that the required dynamic calculations are made.
机译：本文研究了由高度为14厘米的五层交叉层压木材面板的人类作用引起的振动。分析由三个相同高度的面板制成，但在跨层中的厚度的厚度厚度不同，改变它们的跨度。面板的纵向层具有比横向层更好的物理和机械特性。指定了在设计阶段的地板结构中观察到的相关标准，以确保有关动态负荷的可接受的行为。还给出了限制值。由于非常难以确定人类可接受性的阈值，因为有人发现令人不安的振动不必对他人令人不安，因此在文献中最高代表的基础上选择了工作中使用的相关标准：自然频率限制，单位载荷偏转限制和组合标准。使用γ方法，K法和Kreuzinger类比进行面板的有效弯曲刚度的计算。分析确定每个面板的固有频率，因此由于单位静力而导致的最大偏转，并将所得结果与通过ANSYS软件包中的模态和静态分析所获得的值进行比较。将所有获得的数据与有效标准进行比较，选择符合可维护性限制状态的标准的面板。结果表明，根据所有标准，在与人类行动有关的充分动态行为方面，高达4.5米的分析的地板面板是可接受的。此外，结果表明，由于单位静态力与固有频率极限相比，组合标准和单位载荷偏转极限是显着更严格的。如果CLT面板的最低所需的固有频率被值为8 Hz，那么与可用文献中的较高版本相对应，跨度可能会高达6米。在获得的结果的基础上，可以得出结论，在楼层结构的设计中，除了静态稳定性之外，必须提供对由日常人类活动引起的倡议的充分动态响应。结果还表明，分析的地板CLT面板可以非常成功地应用于住宅和商业建筑的地板结构中，只要需要所需的动态计算。

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