Model for the prediction of the tensile strength and tensile stiffness of knot clusters within structural timber
Model for the prediction of the tensile strength and tensile stiffness of knot clusters within structural timber
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DOI：
10.1007/s00107-014-0781-0
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发表时间：
2014-05-01
影响因子：
2.6
通讯作者：
Kohler, Jochen
中科院分区：
文献类型：
--
作者：
Fink, Gerhard;Kohler, Jochen
本文提出了一种预测局部强度和刚度特性的模型。与现有模型相比，本文根据木材的形态特征来描述木材的局部材料特性，即将木材板材细分为有节段(节段)和无节段(透明木段)。在非破坏性拉伸试验过程中，使用光学摄像设备测量相应截面的应变。在这些测量的基础上，估算了每个特定截面的拉伸刚度。为了估计抗拉强度，进行了破坏性拉伸试验。在此，测量了整个木板的抗拉强度。其他节点簇的强度使用删失回归分析来估计。考虑到实验研究的结果，建立了材料模型来预测节点簇的抗拉强度和抗拉刚度。
In the present paper, a model for the prediction of the local strength and stiffness properties is developed. Compared to existing models, here the local material properties are described according to their morphological characteristics; i.e. the timber boards are subdivided into sections containing knots (knot sections) and sections without knots (clear wood sections). The strains of the corresponding sections are measured during non-destructive tensile tests using an optical camera device. Based on these measurements the tensile stiffness of each particular section is estimated. For the estimation of the tensile strength, destructive tensile tests are performed. Herewith, the tensile strength of the entire timber board is measured. The strength of the other knot clusters are estimated using censored regression analysis. Taking into account the results of the experimental investigation, material models are developed to predict the tensile strength and the tensile stiffness of knot clusters.