Structural dynamics of a dowelled-joist timber floor in the low-frequency range modelled using finite element simulation
Structural dynamics of a dowelled-joist timber floor in the low-frequency range modelled using finite element simulation
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DOI：
10.1016/j.engstruct.2017.07.009
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发表时间：
2017-10
影响因子：
5.5
通讯作者：
M. Filippoupolitis;C. Hopkins;R. Völtl;U. Schanda;J. Mahn;L. Krajči
中科院分区：
文献类型：
--
作者：
M. Filippoupolitis;C. Hopkins;R. Völtl;U. Schanda;J. Mahn;L. Krajči
本文介绍了有限元法（FEM）的发展和验证，以模拟动力响应的销托梁木地板。这是一个由木托梁组成的实心地板，木托梁使用木榫连接，单独的组件使用倾斜的金属螺钉连接。重点是在低频范围内的结构动力学高达200赫兹，这是相关的范围内的冲击声绝缘和振动服务。形成每个组件的托梁之间的销钉连接在FEM模型中使用刚性或弹簧连接器建模。实验模态分析的验证表明，这两种方法是有效的特征频率，模态保证标准（MAC）和空间平均速度与点激励。虽然在MAC分析中，具有弹簧连接器的FEM模型具有更多的相关模式，但这需要在预测响应之前去除许多虚假模式。经验证的模型被用来证明的潜力，在预测评估参数的振动适用性，包含在EN 1995-1-1（欧洲规范5）。这种振动适用性评估的预测方法的优点在于，它可以用于具有非标准边界条件或平面图的非标准木地板。
This paper concerns the development and validation of Finite Element Methods (FEM) to simulate the dynamic response of a dowelled-joist timber floor. This is a solid floor comprised of timber joists connected using timber dowels with individual assemblies connected using inclined metal screws. The focus is on the structural dynamics in the low-frequency range up to 200 Hz which is the relevant range for impact sound insulation and vibration serviceability. Dowel connections between the joists that formed each assembly were modelled using either rigid or spring connectors in the FEM models. The validation against experimental modal analysis showed that both approaches were valid in terms of the eigenfrequencies, Modal Assurance Criterion (MAC) and the spatial-average velocity with point excitation. Whilst the FEM model with spring connectors had a higher number of correlated modes in theMACanalysis, this required removal of many spurious modes before predicting the response. The validated models were used to demonstrate the potential in predicting assessment parameters for vibration serviceability that are contained in EN 1995-1-1 (Eurocode 5). This predictive approach to the evaluation of vibration serviceability has the advantage in that it can be used for non-standard timber floors with non-standard boundary conditions or floor plans.