Theoretical modal analysis of freely and simply supported RC slabs

Ahmed, M.S. and Mohammad, F.A. ORCID: 0000-0001-6955-4261, 2014. Theoretical modal analysis of freely and simply supported RC slabs. International Journal of Mechanical, Aerospace, Industrial, Mechatronic and Manufacturing Engineering, 8 (12), pp. 2042-2046.

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Abstract

This paper focuses on the dynamic behavior of reinforced concrete (RC) slabs. Therefore, the theoretical modal analysis was performed using two different types of boundary conditions. Modal analysis method is the most important dynamic analyses. The analysis would be modal case when there is no external force on the structure. By using this method in this paper, the effects of freely and simply supported boundary conditions on the frequencies and mode shapes of RC square slabs are studied. ANSYS software was employed to derive the finite element model to determine the natural frequencies and mode shapes of the slabs. Then, the obtained results through numerical analysis (finite element analysis) would be compared with the exact solution. The main goal of the research study is to predict how the boundary conditions change the behavior of the slab structures prior to performing experimental modal analysis. Based on the results, it is concluded that simply support boundary condition has obvious influence to increase the natural frequencies and change the shape of the mode when it is compared with freely supported boundary condition of slabs. This means that such support conditions have the direct influence on the dynamic behavior of the slabs. Thus, it is suggested to use free-free boundary condition in experimental modal analysis to precisely reflect the properties of the structure. By using free-free boundary conditions, the influence of poorly defined supports is interrupted.

Item Type: Journal article
Publication Title: International Journal of Mechanical, Aerospace, Industrial, Mechatronic and Manufacturing Engineering
Creators: Ahmed, M.S. and Mohammad, F.A.
Publisher: World Academy of Science, Engineering and Technology
Date: 2014
Volume: 8
Number: 12
Identifiers:
NumberType
scholar.waset.org/1999.8/10000108Other
Divisions: Schools > School of Architecture, Design and the Built Environment
Depositing User: Jill Tomkinson
Date Added: 26 Feb 2016 11:53
Last Modified: 09 Jun 2017 13:59
URI: http://irep.ntu.ac.uk/id/eprint/27051

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