Non-linear analysis of dowelled timber connections: a new approach for embedding modelling
Non-linear analysis of dowelled timber connections: a new approach for embedding modelling
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销钉木材连接的非线性分析：嵌入建模的新方法
DOI：
10.56748/ejse.546
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发表时间：
2005
影响因子：
0.6
通讯作者：
J.F. Bocquet
中科院分区：
文献类型：
--
作者：
P. Racher;J.F. Bocquet
开发了一个有限元模型来分析木材连接的行为，同时考虑到紧固件下面木材的塑性行为。局部非线性控制着木材节点的刚度和承载能力。其结果是木材内部的应力状态和紧固件之间的荷载分布相互作用，导致了块体剪切破坏等脆性破坏模式。本文提出了一种基于开发紧固件附近木材的伪三维模型的新方法。根据观察到的行为，该有限元模型被开发来描述紧固件下木材的几何和力学非线性行为的微观尺度。考虑到木材的正交各向异性，紧固件周围的木材被建模为一个由基本有限元组成的结构。该模型还考虑了摩擦、接触和木材内部出现的各种不可逆变形。对云杉、冷杉和云杉三种树种的嵌入行为进行了分析。实验结果与仿真结果的比较表明，该方法具有较好的逼近性。在木材连接分析中，附加的敏感性分析验证了模型耦合紧固件变形和木材应力的效率。
A finite element modelling is developed to analyse the behaviour of timber connections taking into account the plastic behaviour of the timber beneath the fasteners. The local non linearities control the stiffness and the load-carrying capacity of the timber joints. It results in interaction effects on the stress states in the timber and the load distribution among the fasteners that can lead to brittle failure modes such as the block shear failure.This paper presents a new approach based on the development of a pseudo three-dimensional model for the timber in the vicinity of the fasteners. According to the observed behaviour, this finite element model was developed to describe the geometrical and mechanical non-linear behaviours at the micro-scale of the wood beneath the fasteners. Considering the orthotropic behaviour of the timber, the timber around the fasteners is modelled as a structure made up of elementary finite elements. The model accounts also for the friction, the contact and the various irreversible deformations which appear within the timber. An analysis of the embedding behaviour is carried out for three species: spruce, hem-fir and iroko. The comparison of experimental and simulated results shows that this new approach provides a good approximation. An additional sensibility analysis calibrates the model efficiency for coupling the fastener deformation and the timber stresses in the analysis of timber connections.