Analytical Study on the Hysteretic Properties of Mechanical Timber Joints

机械木节点迟滞性能的分析研究

• 批准号: 07660205
• 负责人: HIRAI Takuro
• 金额: $ 1.6万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07660205/
• 关键词: nailed joint; drift-pinned joint; beam on elastic foundation; stepwise linear analysis; hysteretic property; bearing property; 面圧試験; 構造用針葉樹材; 数値解析; 片振; 両振

Hysteretic behavior of mechanical timber joints subjected to cyclic loading was analyzed theoretically. Stepwise linear analyzes based on the theory of a beam on an elastic foundation was adopted in this study. Load-slip relationships of Nailed timber joints with plywood side-members, which are popular in light frame timber construction, under cyclic loading particularly were analyzed in the first year. In the second year, cyclic load-slip relationships of drift-pinned joints with steel center webs, which are popular in heavy timber construction, were analyzed.In the first year, mechanical properties of the nail, which were required to evaluate the elasto-plastic bending stiffness of the nail, was determined by tensile tests of the wire material of the nails. Bearing stiffness of the timber under a nail, which also is required, were determined by monotonic, semi-cyclic and cyclic bearing tests. In the bearing tests, nails were driven into thin wood bearing specimens without lead holes … More so that the nails initially are gripped tight which could simulate the actual initial condition of the nail. From these test results, a hysteresis loop model was proposed considering the loading direction to the grain, impairment of bearing stress due to cyclic loading. To verify the analyzes, single-shear tests of nailed specimens with timber main-members and plywood side-members were conducted. The load-slip curves analyzed with the hysteresis loop model obtained in this study showed good agreement with the experimental results.In the second year, similar experimental and analytical procedures are traced for the analyzes of the load-slip relationships of drift-pinned joints. Elasto-plastic bending stiffness of the drift-pin was determined directly from the test results of pure bending tests. Bearing stiffness of the timber under a drift-pin was determined ordinary bearing tests. Cyclic tests of drift-pinned joints with steel center webs were done to verify the analyzes. The computing program made for nailed joints were modified for drift-pinned joints. Analytical results successfully fitted the experimental results. Less

理论上分析了经受循环载荷的机械木接头的滞后行为。在本研究中采用了基于弹性基础上光束理论的逐步线性分析。在第一年，在循环载荷下，在轻框木材结构中很受欢迎的钉木接头与胶合板侧成员的负载滑移关系在第一年进行了分析。在第二年，分析了在重型木材结构中流行的钢中心网的循环载荷滑移关系。在第一年中，由指甲的弹性型弯曲刚度进行了指甲的机械性能，这是由指甲的弹性型弯曲刚度进行的。通过单调，半循环和循环轴承测试确定了指甲下木材的刚度。在轴承测试中，指甲被驱动到没有铅孔的薄木轴承标本中……更重要的是，指甲最初是紧密的，可以模拟指甲的实际初始状态。从这些测试结果中，提出了一个磁滞回路模型，考虑到谷物的载荷方向，由于循环载荷而导致轴承应力受损。为了验证分析，进行了用木材主会员和胶合板侧成员的钉子标本的单剪切测试。在这项研究中获得的磁滞回路模型分析的载荷滑动曲线与实验结果相吻合。第二年，可以追溯到第二年的实验和分析程序，以分析漂移拟合关节的载荷滑移关系。从纯弯曲测试的测试结果直接确定漂移杆的弹性塑料弯曲刚度。在漂移脚架下木材的轴承刚度是普通的轴承测试。对钢中心网的漂移小键接头进行了循环测试，以验证分析。针对钉子的接头制定的计算程序已修改为漂移拟的关节。分析结果成功拟合了实验结果。较少的

项目成果

Wakashima, Y. ; Hirai, T: "Nail-Wood Bearing Properties I." Mokuzai Gakkaishi. 42 (6). 574-580 (1996)

若岛，Y.；