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Materials 2015, 8(8), 5298-5312; doi:10.3390/ma8085242

Effect of Stress Amplitude on the Damping of Recycled Aggregate Concrete

1
Department of Civil Engineering, Shaoxing University, Shaoxing 312000, China
2
Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China
3
Department of Structural Engineering, Tongji University, Shanghai 200092, China
*
Author to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 23 July 2015 / Revised: 5 August 2015 / Accepted: 11 August 2015 / Published: 14 August 2015
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Abstract

Damping characterizes the energy dissipation capacity of materials and structures, and it is affected by several external factors such as vibrating frequency, stress history, temperature, and stress amplitude. This study investigates the relationship between the damping and the stress amplitude of environment-friendly recycled aggregate concrete (RAC). First, a function model of a member’s loss factor and stress amplitude was derived based on Lazan’s damping-stress function. Then, the influence of stress amplitude on the loss tangent of RAC was experimentally investigated. Finally, parameters used to determine the newly derived function were obtained by numerical fitting. It is shown that the member’s loss factor is affected not only by the stress amplitude but also by factors such as the cross section shapes, boundary conditions, load types, and loading positions. The loss tangent of RAC increases with the stress amplitude, even at low stress amplitude. The damping energy exponent of RAC is not identically equal to 2.0, indicating that the damping is nonlinear. It is also found that the energy dissipation capacity of RAC is superior to that of natural aggregate concrete (NAC), and the energy dissipation capacity can be further improved by adding modified admixtures. View Full-Text
Keywords: stress amplitude-dependent damping; loss factor; recycled aggregate concrete; damping energy coefficient; damping energy exponent stress amplitude-dependent damping; loss factor; recycled aggregate concrete; damping energy coefficient; damping energy exponent
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Liang, C.; Liu, T.; Xiao, J.; Zou, D.; Yang, Q. Effect of Stress Amplitude on the Damping of Recycled Aggregate Concrete. Materials 2015, 8, 5298-5312.

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