Effect of Stress Amplitude on the Damping of Recycled Aggregate Concrete

Materials

Chaofeng Liang²  Tiejun Liu¹  Jianzhuang Xiao³  Dujian Zou¹  Qiuwei Yang² 

[1] Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China; E-Mail:;Department of Civil Engineering, Shaoxing University, Shaoxing 312000, China; E-Mails:;Department of Structural Engineering, Tongji University, Shanghai 200092, China; E-Mail:

关键词: stress amplitude-dependent damping;    loss factor;    recycled aggregate concrete;    damping energy coefficient;    damping energy exponent;   

DOI  :  10.3390/ma8085242

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.