Analyzes on the Lateral Resistance of Nailed Timber Joints

钉接木节点的侧向阻力分析

基本信息

批准号：
05660176
负责人：
HIRAI Takuro
金额：
$ 1.41万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

Maximum lateral resistance and typical fracture modes of nailed timber joints were investigated both experimentally and theoretically.First, destructive single shear tests of nailed timber joints in loading perpendicular to the grain were conducted to observe their defomation and fracture behavior and the resultant maximum lateral resistance.Timber main-members and Duglas-fir plywood side-members or steel side-members were connected with CN50 or CN75 nails in the first test group.Timber main-members and timber side-members were connected with CN75 nails considering four possible combinations of grain directions of the timber members in the second test group.Test results showed the great possibility of brittle cracking fractures of timber members when they were loaded perpendicular to the grain.Second, the maximum lateral resistance and the possible fracture modes of nailed timber-plywood joints were analyzed using the theory of a beam on an elastic foundation.In which, a particular fracture criterion, "fracture bearing displacement (FBD)", which had been originally introduced by the author, was adopted to analyze the cracking fracture of timber members in loading prependicular to the grain.Punching shear of the plywood side-members was also taken into consideration, because most of the specimens loaded parallel to the grain failed in this mode.The criterion for this fracture mode was assumed that the joint failed when any part of the contour of the nail head penetrated through the plywood.These two fracture criteria were examined on every step of each analysis, then the fracture mode and the maximum lateral resistance were determined if either of them is satisfied first.The results of analyzes agreed with the test reaults in the prediction of the fracture modes, the resultant maximum lateral resistance and the maximum joint slips.

在实验和理论上研究了钉木接头的最大侧向电阻和典型的骨折模式。首先，在垂直于谷物的载荷中，对钉木接头的破坏性单剪切试验进行了观察，以观察它们的衰竭和最大的侧面抵抗。 were connected with CN50 or CN75 nails in the first test group.Timber main-members and timber side-members were connected with CN75 nails considering four possible combinations of grain directions of the timber members in the second test group.Test results showed the great possibility of brittle cracking fractures of timber members when they were loaded perpendicular to the grain.Second, the maximum lateral resistance and the possible fracture modes of nailed timber-plywood joints were analyzed using the theory of a beam on an elastic foundation.In which, a particular fracture criterion, "fracture bearing displacement (FBD)", which had been originally introduced by the author, was adopted to analyze the cracking fracture of timber members in loading prependicular to the grain.Punching shear of the plywood side-members was also taken into consideration, because most在这种模式下，与平行于谷物平行的标本失败。该断裂模式的标准假定，当指甲头的任何部分穿过胶合板渗透到胶合板上的任何部分时，关节失败了。在每个分析的每个分析中都检查了两个分析的裂缝标准。断裂模式，最大最大侧向电阻和最大关节滑动。