摘要
试验研究了马尾松Pinus massoniana木材榫卯结构拉伸试验的破坏特征及干、湿2种初始含水率状态下的抗拉伸强度随含水率变化的情况.结果表明榫卯接合构件的强度-行程曲线是一条峰、谷值不断下降的锯齿状曲线,分析认为榫卯结构的拉伸破坏过程是一个静磨擦与动磨擦交替变化的过程;高含水率马尾松材制作的榫卯结构随着含水率进一步下降,抗拉强度下降非常明显,而低含水率马尾松材制作的榫卯结构随着含水率升高,抗拉强度会增加.因此,用于制作木制品的木材需将含水率干燥到当地气候的平衡含水率以下,以保证木制品结构的稳定性;增加榫头与榫眼的过盈量实现紧配合有助于提高榫卯结构的接合强度.
Effects of moisture content and embedding tolerance on the pull-out resistance of the rectangular mortise and tenon joint of mason pine（Pinus massoniana）wood were studied.The main findings were summarized as follows： 1） The pull-out load vs.pull-out displacement curve of the rectangular mortise and tenon joint insisted of a linearly ascending part and a descending part,which was thought to be a cyclic static and dynamic friction procedure.2） The pull-out strength increased when the moisture content of the mortise-tenon joint was increasing from low initial moisture content（13.3%）,whereas the pull-out strength decreased when the moisture content of mortise-tenon joint was decreasing from high initial moisture content（22.1%）.The initial moisture content of mortise-tenon joint must be dried below the point of the equilibrium moisture content of the local area to maintain the designed strength of the wood products.3） The pull-out load increased with the increase of the assembling tolerance within the range,in which the mortise and tenon joint would not be damaged while assembling.
出处
《华南农业大学学报》
CAS
CSCD
北大核心
2007年第4期108-111,共4页
Journal of South China Agricultural University
基金
华南农业大学校长基金(4400-K05107)
关键词
榫卯结构
拉伸强度
含水率
木制品
mortise-tenon connection
tensile strength
moisture content
wood products
