文献类型：期刊文献

英文题名：Effects of Strongbacks and Strappings on Vibrations of Timber Truss Joist Floors

作者：Xue, Shuo[1] Zhang, Zhanyi[2,3] Zhou, Haibin[2,4] Shen, Yinlan[5]

第一作者：Xue, Shuo

通信作者：Zhou, HB[1];Zhou, HB[2]

机构：[1]China State Railway Grp Co Ltd, Beijing 100844, Peoples R China;[2]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China;[3]China Orient Inst Noise & Vibrat, Beijing 100085, Peoples R China;[4]Natl Engn Res Ctr Wood Ind, Beijing 102300, Peoples R China;[5]Beijing Univ Technol, Beijing 100124, Peoples R China

年份：2021

卷号：2021

外文期刊名：SHOCK AND VIBRATION

收录：;EI(收录号：20213010679790);Scopus(收录号：2-s2.0-85111016306);WOS:【SCI-EXPANDED(收录号:WOS:000675820600001)】；

基金：This project was supported by the National Natural Science Foundation of China under Grant no. 31770603.

语种：英文

外文关键词：Building materials - Natural frequencies - Plate metal - Strapping - Timber - Transmissions - Trusses - Vibrations (mechanical)

摘要：It is well known that the vertical vibrations of lightweight timber floors would cause discomfort to the occupants. As a new kind of flooring system, the metal-plate-connected timber truss joist floors were developed due to their larger spans and easier crossing of pipes and cables after sawn timber and I-joist floors. In this paper, the vibration modes and transfer functions of sixteen metal-plate-connected timber truss joist floors over a nominal span of 6 m were determined experimentally to measure the changes in vibration frequencies and transmissions obtained after the installation of strongbacks and strappings. The results showed that the fundamental natural frequencies of the metal-plate-connected timber truss joist floors at a 400 mm joist spacing were about 15 Hz, while the frequencies of the floors at a 600 mm joist spacing were about 12.5 Hz. The bracing elements of the strongbacks and strappings mainly enhanced the system stiffness in the across-joist direction of the flooring system, but they did not govern the fundamental natural frequencies of the floors and just changed the spacing of adjacent natural frequencies. The bracing elements as secondary elements of the floors also altered the vibration transmission paths in the across-joist direction. The frequencies where the stronger vibration transfers happened in the direction perpendicular to floor joists were generally above 15 Hz. Proper installation measurements of bracing elements in practical control need to be taken to alleviate the vibration response intensity at the targeted locations and frequencies.