Relationship between clamp force and pull-out strength in lag screw timber joints

作     者：Matsubara, Doppo Wakashima, Yoshiaki Fujisawa, Yasushi Shimizu, Hidemaru Kitamori, Akihisa Ishikawa, Koichiro 

作者机构：Tokyo Metropolitan Ind Technol Res Inst Koto Ku 2-4-10 Aomi Tokyo 1350064 Japan Toyama Prefectural Agr Forestry & Fisheries Res C 4940 Imizu Toyama 9390311 Japan Sugiyama Jogakuen Univ Chikusa Ku Nagoya Aichi 4648662 Japan Kyoto Univ Res Inst Sustainable Humanosphere Uji Kyoto 6110011 Japan Univ Fukui Fukui Fukui 9108507 Japan 

出 版 物：《JOURNAL OF WOOD SCIENCE》 (J. Wood Sci.)

年 卷 期：2017年第63卷第6期

页      面：625-634页

核心收录：

学科分类：0907[农学-林学] 08[工学] 0829[工学-林业工程] 09[农学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Science and Technology Research Promotion Program for Agriculture  Forestry  Fisheries and Food Industry 

主　　题：Lag screw joints Clamp force Pull-out strength Tightening test 

摘      要：This study empirically examines the relationship between clamp force and pull-out strength in lag screw joints of timber members, using data obtained in tightening tests and pull-out tests. Maximum clamp force per unit screw length as determined from the tightening tests was lower than the lower bound for the 95% tolerance range for pull-out strength per unit screw length as determined from the pull-out tests. Moreover, X-ray CT (computed tomography) observations of anchor members from both tests revealed that failure behavior clearly differed between the tightening test and the pull-out test: tightening caused damage to the wooden, female thread in addition to major splitting damage in the wood perpendicular to the grain near the tip of the lag screw.