Li Zuohua, Peng Zhihan, Teng Jun, Wang Ying
School of Civil and Environment Engineering, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China.
IoT Application Technology Center of NDT, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China.
Materials (Basel). 2016 Apr 8;9(4):278. doi: 10.3390/ma9040278.
This paper presents an experimental study on circular stirrup-confined concrete specimens under uniaxial and monotonic load. The effects of stirrup volume ratio, stirrup yield strength and concrete strength on damage evolution of stirrup-confined concrete were investigated. The experimental results showed that the strength and ductility of concrete are improved by appropriate arrangement of the stirrup confinement. Firstly, the concrete damage evolution can be relatively restrained with the increase of the stirrup volume ratio. Secondly, higher stirrup yield strength usually causes larger confining pressures and slower concrete damage evolution. In contrast, higher concrete strength leads to higher brittleness, which accelerates the concrete damage evolution. A plastic strain expression is obtained through curve fitting, and a damage evolution equation for circular stirrup-confined concrete is proposed by introducing a confinement factor () based on the experimental data. The comparison results demonstrate that the proposed damage evolution model can accurately describe the experimental results.
本文介绍了圆形箍筋约束混凝土试件在单轴单调荷载作用下的试验研究。研究了箍筋体积比、箍筋屈服强度和混凝土强度对箍筋约束混凝土损伤演化的影响。试验结果表明，通过合理布置箍筋约束可提高混凝土的强度和延性。首先，随着箍筋体积比的增加，混凝土损伤演化可得到相对抑制。其次，较高的箍筋屈服强度通常会导致较大的约束压力和较慢的混凝土损伤演化。相比之下，较高的混凝土强度会导致更高的脆性，从而加速混凝土损伤演化。通过曲线拟合得到了塑性应变表达式，并基于试验数据引入约束系数（）提出了圆形箍筋约束混凝土的损伤演化方程。对比结果表明，所提出的损伤演化模型能够准确描述试验结果。
