Rayleigh Damping Coefficients of Laminated Rubber Bearing
Ahmad Idzwan Yusuf1, Norliyati Mohd Amin2
1Ahmad Idzwan Yusuf, Faculty of Civil Engineering, Universiti Teknologi MARA, Pasir Gudang, Malaysia.
2Norliyati Mohd Amin, Faculty of Civil Engineering, Universiti Teknologi MARA, Shah Alam, Malaysia.
Manuscript received on November 17., 2019. | Revised Manuscript received on November 24 2019. | Manuscript published on 30 November, 2019. | PP: 12294-12300 | Volume-8 Issue-4, November 2019. | Retrieval Number: D5203118419/2019©BEIESP | DOI: 10.35940/ijrte.D5203.118419
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: In isolating the ground structure and the above ground structure from seismic loads, a significant device called laminated rubber bearing is usually found in structure. The complexity of the material which is made up from a combination of rubber and steel shim plates in alternate layer, has made it difficult to measure damping value. Damping is a dissipation of energy or energy losses in the vibration of the structure. Measuring the accurate amount of damping is fundamental as damping plays a crucial role in fixing the borderline between stability and instability in structural systems. Therefore, to determine the damping value including dynamic properties in any materials, modal analysis can be used. Hence, the main objective of this research is to determine the Rayleigh’s damping coefficients α and β and to evaluate the performance of the laminated rubber bearing using finite element and experimental modal analysis. Finding shows that, the finite element modal analysis with the addition of Rayleigh’s damping coefficients α and β, shows a good agreement with the experimental modal analysis in term of natural frequencies and mode shapes. Findings show that, the values of natural frequencies reduced when precise Rayleigh’s damping coefficient added in the finite element modal analysis. It can be concluded that both finite element and experimental modal analysis method can be used to estimate the accurate values of damping ratio and to determine the Rayleigh’s damping coefficients α and β as well.
Keywords: Rayleigh Damping, Experimental Modal Analysis, Finite Element Modal Analysis, Laminated Rubber Bearing.
Scope of the Article: Predictive Analysis.