Experimental identification of exponential damping for reinforced concrete cantilever beams

Abstract

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.