Effects of Strongbacks and Strappings on Vibrations of Timber Truss Joist Floors
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...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2021/6630719 |
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| _version_ | 1832560648301576192 |
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| author | Shuo Xue Zhanyi Zhang Zhanyi Zhang Haibin Zhou Yinlan Shen |
| author_facet | Shuo Xue Zhanyi Zhang Zhanyi Zhang Haibin Zhou Yinlan Shen |
| author_sort | Shuo Xue |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-16a3f4286a08439d8edadf1449020a84 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-16a3f4286a08439d8edadf1449020a842025-02-03T01:27:01ZengWileyShock and Vibration1070-96221875-92032021-01-01202110.1155/2021/66307196630719Effects of Strongbacks and Strappings on Vibrations of Timber Truss Joist FloorsShuo Xue0Zhanyi Zhang1Zhanyi Zhang2Haibin Zhou3Yinlan Shen4China State Railway Group Co., Ltd., Beijing 100844, ChinaResearch Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, ChinaChina Orient Institute of Noise and Vibration, Beijing 100085, ChinaResearch Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, ChinaBeijing University of Technology, Beijing 100124, ChinaIt 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.http://dx.doi.org/10.1155/2021/6630719 |
| spellingShingle | Shuo Xue Zhanyi Zhang Zhanyi Zhang Haibin Zhou Yinlan Shen Effects of Strongbacks and Strappings on Vibrations of Timber Truss Joist Floors Shock and Vibration |
| title | Effects of Strongbacks and Strappings on Vibrations of Timber Truss Joist Floors |
| title_full | Effects of Strongbacks and Strappings on Vibrations of Timber Truss Joist Floors |
| title_fullStr | Effects of Strongbacks and Strappings on Vibrations of Timber Truss Joist Floors |
| title_full_unstemmed | Effects of Strongbacks and Strappings on Vibrations of Timber Truss Joist Floors |
| title_short | Effects of Strongbacks and Strappings on Vibrations of Timber Truss Joist Floors |
| title_sort | effects of strongbacks and strappings on vibrations of timber truss joist floors |
| url | http://dx.doi.org/10.1155/2021/6630719 |
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