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Steel and Composite Structures
  Volume 37, Number 4, November25 2020 , pages 391-404

Vibration behavior of large span composite steel bar truss-reinforced concrete floor due to human activity
Liang Cao, Jiang Li, Xing Zheng and Y. Frank Chen

    Human-induced vibration could present a serious serviceability problem for large-span and/or lightweight floors using the high-strength material. This paper presents the results of heel-drop, jumping, and walking tests on a large-span composite steel rebar truss-reinforced concrete (CSBTRC) floor. The effects of human activities on the floor vibration behavior were investigated considering the parameters of peak acceleration, root-mean-square acceleration, maximum transient vibration value (MTVV), fundamental frequency, and damping ratio. The measured field test data were validated with the finite element and theoretical analysis results. A comprehensive comparison between the test results and current design codes was carried out. Based on the classical plate theory, a rational and simplified formula for determining the fundamental frequency for the CSBTRC floor is derived. Secondly, appropriate coefficients (Brp) correlating the MTVV with peak acceleration are suggested for heel-drop, jumping, and walking excitations. Lastly, the linear oscillator model (LOM) is adopted to establish the governing equations for the human-structure interaction (HSI). The dynamic characteristics of the LOM (sprung mass, equivalent stiffness, and equivalent damping ratio) are determined by comparing the theoretical and experimental acceleration responses. The HSI effect will increase the acceleration response.
Key Words
    vibration serviceability; composite steel bar truss-reinforced concrete (CSBTRC) floor; human-structure interaction; large-span floor; fundamental frequency
Liang Cao, Jiang Li and Xing Zheng: School of Civil Engineering, Chongqing University, Chongqing 400045, China;
Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University),
Ministry of Education, Chongqing 400045, China
Y. Frank Chen: Department of Civil Engineering, The Pennsylvania State University, Middletown, PA 17055, USA

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