A hysteresis model for timber joints with dowel-type fasteners
A hysteresis model for timber joints with dowel-type fasteners
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DOI：
10.1016/j.engstruct.2017.12.011
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发表时间：
2018-02
影响因子：
5.5
通讯作者：
Matteo Izzi;G. Rinaldin;A. Polastri;M. Fragiacomo
中科院分区：
文献类型：
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作者：
Matteo Izzi;G. Rinaldin;A. Polastri;M. Fragiacomo
预测带有销钉型紧固件的木材接头的机械行为和失效机制需要考虑多种因素，包括金属紧固件的几何和机械性能、木材的物理性能以及这些元素之间的相互作用。本文提出了一种数值模型，其中接头被示意为非线性介质中具有仅压缩行为的弹塑性梁。与文献中发表的大多数磁滞模型采用的微分方法不同，该模型使用简单的机械关系和基本输入参数来预测载荷-位移响应。此外，该模型能够再现木材压碎在紧固件周围形成的空腔的影响，并模拟循环条件下的迟滞行为和能量耗散。在交叉层压木材中的钉钢与木材接头上进行剪切测试，并将结果与在类似的单紧固件接头上获得的实验测试数据进行比较。仿真可以准确预测机械行为（初始刚度、最大承载能力、负载曲线的整体形状和滞后循环）以及测试中观察到的总能量耗散。
Predicting the mechanical behaviour and the failure mechanism of timber joints with dowel-type fasteners requires consideration of several factors, including the geometrical and mechanical properties of the metal fastener, the physical properties of timber and the interaction between such elements. This paper proposes a numerical model where a joint is schematized as an elasto-plastic beam in a non-linear medium with a compression-only behaviour. Unlike the differential approach adopted by most of the hysteresis models published in literature, this model predicts the load-displacement response using simple mechanical relationships and basic input parameters. Furthermore, the model is capable of reproducing the effect of the cavity formed around the fastener by timber crushing, and simulates the hysteretic behaviour and the energy dissipation under cyclic conditions. Shear tests are reproduced on nailed steel-to-timber joints in Cross-Laminated Timber and results are compared to the experimental test data obtained on similar single fastener joints. Simulations lead to accurate predictions of both the mechanical behaviour (initial stiffness, maximum load-carrying capacity, global shape of the loading curve and of the hysteresis cycles) and the total energy dissipation observed in the tests.