Steel and Composite Structures

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Experimental studies on vibration serviceability of composite steel-bar truss slab with steel girder under human activities

  • Cao, Liang (Key Laboratory for Damage Diagnosis of Engineering Structures of Hunan Province, Hunan University) ;
  • Tan, Yongchao (School of Civil Engineering, Central South University) ;
  • Li, Jiang (School of Civil Engineering, Chongqing University)
  • Received : 2020.12.17
  • Accepted : 2021.07.26
  • Published : 2021.09.10
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Abstract

In this study, the vibration serviceability of a composite steel-bar truss slab with steel girder system considering the human-structure interaction was investigated systematically through the on-site testing. Impulse excitations (heel-drop and jumping) and steady-state motions (walking and running) were performed to capture the primary vibration parameters (natural frequency, model shape, and damping ratio) and the distribution of peak accelerations. The composite floor possesses a low frequency of approximately 7.90 Hz and the damping ratio of ≈ 2.10%. The walking and running excitations by one person (single excitations) were considered to evaluate the vibration serviceability of the composite floor. The measured accelerations show a satisfactory vibration perceptibility. For design convenience and safety, a crest factor 𝛽rp (the ratio of peak acceleration to root-mean-square acceleration induced from an excitation) is proposed. Comparisons of the modal parameters determined from the tests (walking, running, heel-drop, and jumping) reveal there is an interaction exists between the human excitation and the composite floor. This interaction effect reduces the damping ratio of the composite floor.

Keywords

Acknowledgement

The authors are grateful to the support provided by the National Natural Science Foundation of China (Grant No. 51908084), China Postdoctoral Science Foundation (Grant No. 2020M673139), and Natural Science Foundation of Chongqing, China (Project No. cstc2019jcyj-bshX0013).

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