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Finite-Element Model Tuning of Global Modes of a Grandstand Structure Using Ambient Vibration Testing |
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| Authors: | Ghada Saudi Paul Reynolds Mohammed Zaki Hossam Hodhod |
| Affiliation: | 1Lecturer, Institute of Structures and Metallic Constructions, Housing and Building National Research Center, 87 Tahrir St., Doki, Giza, Egypt 12311. E-mail: ghadasaudi@yahoo.com 2Senior Lecturer, Dept. of Civil and Structural Engineering, Univ. of Sheffield, Mappin St., Sheffield S1 3JD, U.K. (corresponding author). E-mail: p.reynolds@sheffield.ac.uk 3Associate Professor, Institute of Structures and Metallic Constructions, Housing and Building National Research Center, 87 Tahrir St., Doki, Giza, Egypt 12311. E-mail: mazakiyy@gmail.com 4Professor, Dept. of Civil and Structural Engineering, Cairo Univ., Giza, Egypt 12613. E-mail: hodhodh2002@yahoo.com |
| Abstract: | This paper describes the experimental and analytical modal analysis of a full-scale cantilevered grandstand. A 3D finite-element model was successfully updated manually based on the global modes identified from ambient vibration measurements. The ambient vibration testing was effective in capturing the global modes of the large grandstand. A number of global vibration modes of the entire grandstand were reliably identified in the frequency range 0–3.1 Hz, in addition to modes in the same frequency range that engaged primarily the cantilever roof structure. Following a two-stage manual FE model updating process, the correlation between the experimental and analytical results showed good agreement, with physically meaningful updated parameters. It was clearly illustrated that both the roof system and the nonstructural elements contributed significantly to the stiffness and mass of the global modes. Useful and novel lessons are highlighted for efficient and reliable future finite-element modeling of global modes of similar grandstand structures. |
| Keywords: | Vibration Finite element method Nonstructural elements Roofs |