Evaluation on structural performance of compressed wood as shear dowel
Evaluation on structural performance of compressed wood as shear dowel
复制标题
DOI：
10.1515/hf.2008.073
复制
发表时间：
2008-07
期刊：
影响因子：
--
通讯作者：
K. Jung;A. Kitamori;K. Komatsu
中科院分区：
文献类型：
--
作者：
K. Jung;A. Kitamori;K. Komatsu
摘要本研究探讨以日本柳杉为原料之压缩材，取代高密度硬木，应用于剪力传力杆。采用木材-木材双向剪切试验，研究了CW的顺纹剪切力学性能，并与几种传力杆材料进行了比较。年轮与加载方向（0°）呈径向的CW具有独特的双剪性能特点，其强度和延性较好，显示出良好的传力性能。相比之下，其年轮与加载方向相切（90°）的CW和枫木表现出脆性破坏。当基础构件的厚度变化时，对于主构件和侧构件，接头的延性分别在直径超过36 mm和厚度超过24 mm时变得稳定。当基础构件的密度增加时，其刚度、屈服载荷和最大载荷随着不同的倾角呈现成比例的改善;然而，在枫木销钉的情况下，增加很小。随着基体密度的增加，极限荷载呈线性正增长趋势，塑性模量呈下降趋势。因此，尽管密度增加，但观察到几乎恒定的能量吸收。通过引入适当的基础构件，可以设计压缩木质销钉接头的最佳承载能力和延性。
Abstract This study addresses the application of compressed wood (CW) made of Japanese cedar, as a substitute for high-density hardwood, to shear dowel. A double wood-to-wood shear test was performed to evaluate the mechanical shear properties of CW perpendicular to the grain, and the results were compared with those of several types of dowel material. CW with its annual ring radial to loading direction (0°) had a unique double shear performance characteristic, and showed good properties as a dowel material by virtue of its strength and rich ductility. In contrast, CW with its annual ring tangential to loading direction (90°) and maple exhibited brittle failure. While thickness of the base member was varied, the ductility of the joint became stable for diameter over 36 mm and 24 mm thickness for the main and side members, respectively. When the density of the base member increased, its stiffness, yield load, and maximum load exhibited proportional improvement with different inclinations; however, in the case of a maple dowel, the increases were small. When the density of the base member was increased, the ultimate load had positive linear tendency, whereas plastic modulus decreased. Consequently, almost constant energy absorption was observed in spite of the increased density. The optimum load-carrying capacity and ductility of a compressed wooden dowel joint could be designed by introducing an appropriate base member.