文献类型：期刊文献

英文题名：Effect of Stress Amplitude on the Damping of Recycled Aggregate Concrete

作者：Liang, Chaofeng[1];Liu, Tiejun[2];Xiao, Jianzhuang[3];Zou, Dujian[2];Yang, Qiuwei[1]

机构：[1]Shaoxing Univ, Dept Civil Engn, Shaoxing 312000, Peoples R China;[2]Harbin Inst Technol, Shenzhen Grad Sch, Shenzhen 518055, Peoples R China;[3]Tongji Univ, Dept Struct Engn, Shanghai 200092, Peoples R China

年份：2015

卷号：8

期号：8

起止页码：5298

外文期刊名：MATERIALS

收录：SCI-EXPANDED(收录号：WOS:000360643900046)、、EI(收录号：20153501217591)、Scopus(收录号：2-s2.0-84940054662)、WOS

基金：This work is supported by National Nature Science Foundation of China (Grant NO. 51422804, 51308340, 51308322), Program for New Century Excellent Talents in University (NCET-13-0171), and Zhejiang Provincial Natural Science Foundation of China (Grant NO. Y1110184)

语种：英文

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

外文摘要：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.