Effective Resistance of Timber Joints with Multiple Fastenings due to their Lead Hole Clearances

由于其铅孔间隙，具有多个紧固件的木接头的有效阻力

基本信息

批准号：
09660172
负责人：
HIRAI Takuro
金额：
$ 2.18万
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：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

First we conducted an experimental study on effective moment resistance of drift-pinned joints with lead hole clearances. We prepared test specimens with two kinds of lead hole clearance (1 and 2mm), two kinds of drift-pin number (4 and 8 drift-pins), and two kinds of length/diameter ratio of drift-pins (6 and 12). Destructive tests of them showed : 1.Centers of rotation of the joints were irregular due to the initial conditions of each drift-pin and they traveled through the loading. 2.The drift-pins with larger length/diameter ratio gave greater maximum resistance of the joints. 3.Spacing between the fastenings gave a obvious effect on the maximum resistance, so that the joints assembled with fewer drift-pins which were arranged with enough spaces had greater maximum resistance.Next we simulated the effective moment resistance of the drift-pinned joints by the Monte Carlo method. Basic data required for the simulation were obtained from the destructive double-shear tests with single drift-pins. Preceding the Monte Carlo simulation, ideal moment-rotation relationship of the joints was analyzed definitely assuming that all drift-pins bore evenly the applied moment An arbitrary assumption that a couple of drift-pins diagonal to each other had the same initial gap along their slip directions was adopted in the Monte Carlo simulation, because anisotropic strength properties of timber joints and indetermination of load distribution among the fastenings made the strict simulations too difficult Major conclusions were : 1 .Effective stiffness of the joints with lead hole clearances were able to be estimated by the Monte Carlo simulation. 2.The definite analysis assuming the initial gaps of 50 percent to the clearance also gave practically appropriate estimation. 3.End/side margins and spacing had great effects on the maximum resistance, which made the prediction of the effective maximum resistance very difficult.

首先，我们对带有铅孔间隙的漂移小链接头有效矩抗性进行了实验研究。我们用两种铅孔间隙（1和2mm），两种漂移杆数（4和8漂移杆）和两种漂移杆的长度/直径比（6和12）准备了测试样品。它们的破坏性测试表明：1。由于每个漂移销的初始条件，关节的旋转中心是不规则的，并且它们穿过载荷。 2.具有较大长度/直径比的漂移杆使关节的最大电阻更大。 3.固定之间的缝隙对最大电阻产生了明显的影响，因此，与足够的空间排列的较少的漂移杆组装在一起的接头具有更大的最大电阻。接下来，我们模拟了Monte Carlo方法对漂移量的有效力矩电阻。模拟所需的基本数据是从单个漂移杆的破坏性双剪切测试中获得的。 Preceding the Monte Carlo simulation, ideal moment-rotation relationship of the joints was analyzed definitely assuming that all drift-pins bore evenly the applied moment An arbitrary assumption that a couple of drift-pins diagonal to each other had the same initial gap along their slip directions was adopted in the Monte Carlo simulation, because anisotropic strength properties of timber joints and indetermination of load distribution among the fastenings made the strict simulations too difficult主要结论是：1。关节具有铅孔间隙的刚度有效的刚度可以通过蒙特卡洛模拟估算。 2.假设清除率50％的初始差距的确定分析也实际上给出了适当的估计。 3.端/侧缘和间距对最大电阻具有很大的影响，这使得有效最大电阻的预测非常困难。