Experimental identification of exponential damping for reinforced concrete cantilever beams

•The validity of the relaxation factor identification with a recently proposed iterative method is verified.•Comparisons are made with different complex modal identification methods and experimental datum.•The exponential damping model gives a precise description of the damping property of reinforce...

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Bibliographic Details
Published in:Engineering structures 2019-05, Vol.186, p.161-169
Main Authors: Su, Li, Mei, Sheng-Qi, Pan, Yu-Hua, Wang, Yuan-Feng
Format: Article
Language:English
Subjects:
Cantilever beams
Cantilevers
Complex mode analysis
Concrete
Concrete structures
Damping capacity
Damping identification
Dynamic tests
Energy dissipation
Exponential damping
Frequency dependence
Frequency response functions
Identification methods
Model accuracy
Non-viscous damping
Parameter identification
Reinforced concrete
Relaxation factor
Resonant frequencies
Vibration
Viscous damping
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Summary:•The validity of the relaxation factor identification with a recently proposed iterative method is verified.•Comparisons are made with different complex modal identification methods and experimental datum.•The exponential damping model gives a precise description of the damping property of reinforcement concrete cantilever beam. Exponential damping is an improved version of the viscous damping model and better represent energy dissipation character of actual structures. This study aims at verifying the applicability of the exponential damping model for concrete structures and the accuracy of model parameter identification methods. In this paper, the dynamic tests are conducted on a series of reinforced concrete cantilever beams to obtain frequency response functions. The obtained results show that the exponential damping model can better reflect the energy dissipation capacity of concrete components, especially in the high frequency vibration modal. The recently proposed identification method based on FEM updating for the exponential damping system can predict accurately not only natural frequencies but also the FRFs of concrete beams. The research of the exponential damping will increase the accuracy and efficiency of dynamic behavior analysis of actual concrete structures.
ISSN:0141-0296
1873-7323
DOI:10.1016/j.engstruct.2019.02.015