Steel and Composite Structures

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Experimental study on vibration serviceability of cold-formed thin-walled steel floor

  • Bin Chen (Chengdu Architectural Design & Research Institute Co., LTD.) ;
  • Liang Cao (College of Civil Engineering, Hunan University) ;
  • Faming Lu (Chengdu Architectural Design & Research Institute Co., LTD.) ;
  • Y. Frank Chen (Department of Civil Engineering, The Pennsylvania State University)
  • Received : 2022.11.17
  • Accepted : 2023.01.19
  • Published : 2023.02.25
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Abstract

In this study, on-site testing was carried out to investigate the vibration performance of a cold-formed thin-walled steel floor system. Ambient vibration, walking excitation (single and double persons), and impulsive excitation (heel-drop and jumping) were considered to capture the primary vibration parameters (natural frequencies, damping ratios, and mode shapes) and vertical acceleration response. Meanwhile, to discuss the influence of cement fiberboard on structural vibration, the primary vibration parameters were compared between the systems with and without the installation of cement fiberboard. Based on the experimental analysis, the cold-formed thin-walled steel floor possesses high frequency (> 10 Hz) and damping (> 2%); the installed cement fiberboard mainly increases the mass of floor system without effectively increasing the floor stiffness and may reduce the effects of primary vibration parameters on acceleration response; and the human-structure interaction should be considered when analyzing the vibration serviceability. The comparison of the experimental results with those in the AISC Design Guide indicates that the cold-formed thin-walled steel floor exhibits acceptable vibration serviceability. A crest factor 𝛽rp (ratio of peak to root-mean-square accelerations) is proposed to determine the root-mean-square acceleration for convenience.

Keywords

Acknowledgement

The authors are grateful to the supports provided by the National Natural Science Foundation of China (Grant No. 52278175, 51908084), the Fundamental Research Funds for the Central Universities (Grant No. 531118010784), and Technical Research and Innovation Project of Chengdu Architectural Design & Research Institute Co., LTD.

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