Techno Press

Computers and Concrete   Volume 14, Number 2, August 2014, pages 163-174
Damping determination of FRP-confined reinforced concrete columns
Xiaoran Li, Yuanfeng Wang and Li Su

Abstract     [Full Text]
    Damping as a material property plays an important role in decreasing dynamic response of structures. However, very little is known about the evaluation and application of the actual damping of Fiber Reinforced Polymer Confined Reinforced Concrete (FRP-C RC) material which is widely adopted in civil engineering at present. This paper first proposes a stress-dependent damping model for FRP-C RC material using a validated Finite Element Model (FEM), then based on this damping-stress relation, an iterative scheme is developed for the computations of the non-linear damping and dynamic response of FRP-C RC columns at any given harmonic exciting frequency. Numerical results show that at resonance, a considerable increase of the loss factor of the FRP-C RC columns effectively reduces the dynamic response of the columns, and the columns with lower concrete strength, FRP volume ratio and axial compression ratio or higher longitudinal reinforcement ratio have stronger damping values, and can relatively reduce the resonant response.
Key Words
    reinforced concrete columns; fiber reinforced polymers; energy dissipation; damping; finite element method; dynamic response
Xiaoran Li, Yuanfeng Wang and Li Su: Department of Civil Engineering, Beijing Jiaotong University, No.3 Shang Yuan Cun, Hai Dian District, Beijing, China

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