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A Fundamental Study about the Design of Impact Fatigue Strength for Metal-fastener Joints of Wood-based Board Construction

人造板建筑金属扣件接头冲击疲劳强度设计的基础研究

基本信息

批准号：
07456082
负责人：
MATAKI Yoshihiro
金额：
$ 3.33万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07456082/
关键词：
wood-based board construction wood screw joint impact bending test behavior of impact response shear-wall nailed joint shear test impact fatigue strength 二面せん断試験衝撃力金具接合 AE発生挙動

项目摘要

In this research, first, the fundamental response behavior of the acceleration pulse and strain developed by impact loading were investigated, and secondly the transition of the response behavior and the decrease process of joint stiffness with the repetition of impact loading were examined. For the experiment, some simplified models of typical joint (nail and wood screw) between various wood-based boards such as plywood, oriented strand board, particleboard, and medium density fiberboard or between wood-based boards and frame materials (wood) were prepared under various joint conditions.First, static bending test with AE (Acoustic emission) measurement was carried out for H-figured joint specimen of particleboard jointed with wood screw as a simple model of a typical wood-based board construction.As a result, itwas evident that the minute destruction progress in the joint, the decrease of joint stiffness and the distribution of stress in the beam were closely related each other. In im … More pact bending test, both the influences of joint stiffness on strain distribution over the beam and of the impact load level on the joint stiffness were elucidated. It was suggested that the amount of the strain in the joint point and the quarter point of the beam was available for the evaluation of the joint stiffness, as a result of analyzing the strain distribution (moment distribution) in the mechanical model of the beam elastically supported at both ends.Secondarily, the static and repetitive impact tests were carried out for the compression type shearing specimen, in which various wood-based boards were connected with nail to both sides of the main member (frame), as a simple model of nailed joint in shear wall. The following results were obtained ; it was evident that the optimum thickness of side member were existed, when the length of nail was constant as used in this experiment. The rate of increase in amount of slipping displacement tended to decrease largely, depending on the combination of the kind of side member and the magnitude of impact load, because of the densification of wood due to the irreversible compressive deformation of members around shank of nail. It was also confirmed that the fatigue process, such as loosening between both members and decreasing of stiffness of joints subjected to repetitive impact loading, depended to a great extent upon the kind and thickness of side member and the magnitude of impact load. Less

本文首先研究了冲击载荷作用下的加速度脉冲和应变的基本响应特性，然后研究了响应特性随冲击载荷重复作用的转变和节点刚度的衰减过程。为了进行试验，对典型节点进行了简化模型在各种接合条件下制备各种木基板如胶合板、定向刨花板、刨花板和中密度纤维板之间或木基板与框架材料（木材）之间的钉（钉子和木螺钉）。声发射静态弯曲试验以刨花板的H型接头试件作为典型木材的简单模型，对用木螺钉连接的刨花板进行了声发射测试。结果表明，节点的微小破坏过程、节点刚度的降低与梁中应力分布密切相关。在im ...更多信息通过冲击弯曲试验，阐明了节点刚度对梁上应变分布的影响以及冲击荷载水平对节点刚度的影响。通过对节点处应变分布的分析，提出了用节点处和四分之一点处的应变大小来评价节点刚度的方法其次，对压缩型剪切试件进行了静态和重复冲击试验，其中各种人造板通过钉连接到主要构件（框架）的两侧，作为剪力墙钉连接的简单模型。结果表明，在钉长一定的情况下，存在最佳的侧梁厚度。由于钉体周围构件的不可逆压缩变形使木材致密化，滑移位移量的增长率有大幅度下降的趋势，这取决于侧构件的类型和冲击载荷的大小。研究还证实，在反复冲击载荷作用下，侧梁的类型、厚度以及冲击载荷的大小在很大程度上决定了侧梁的疲劳过程，如侧梁之间的松动以及连接处刚度的降低。少