Modeling the axial compressive stress-strain behavior of CFRP-confined rectangular RC columns under monotonic and cyclic loading
Modeling the axial compressive stress-strain behavior of CFRP-confined rectangular RC columns under monotonic and cyclic loading
复制标题
模拟单调和循环荷载下 CFRP 约束矩形 RC 柱的轴向压缩应力应变行为
DOI：
10.1016/j.compstruct.2017.11.023
复制
发表时间：
2018-02-01
影响因子：
6.3
通讯作者：
Wang, Zhenyu
中科院分区：
文献类型：
--
作者：
Isleem, Haytham F.;Wang, Daiyu;Wang, Zhenyu
建立了碳纤维复合材料约束钢筋混凝土矩形柱在循环轴压作用下的应力-应变模型。该模型主要基于试验观测和配套研究中报道的一系列试验的结果，其中24个大尺寸CFRP约束的无筋和钢筋混凝土矩形柱在单调和反复轴压下进行了试验。文中还使用了从现有文献汇编的相关实验结果。试验数据库涵盖了无约束混凝土的抗压强度从17.6兆帕到51.5兆帕，横截面边长从90毫米到400毫米。提出的应力-应变模型由三个主要部分组成：(1)循环响应包络曲线的单调应力-应变模型；(2)卸载路径的抛物线表达式；(3)重新加载路径的直线。该模型还考虑了碳纤维布的截面尺寸、高宽比、有效破坏应变、内部纵筋和箍筋等关键参数的影响。最后，通过将该模型的预测结果与选定的测试结果以及其他研究人员的20多个模型的预测结果进行比较，验证了该模型的性能。
This paper presents a stress-strain model for rectangular reinforced concrete (RC) columns confined with carbon fiber-reinforced polymer (CFRP) composites and subjected to cyclic axial compression. The model is mainly based on experimental observations and results from a series of tests reported in the companion study, in which 24 large-size CFRP-confined rectangular unreinforced and reinforced concrete columns under monotonic and cyclic axial compression were tested. Relative experimental results compiled from the available literature are also used. The test database covers unconfined concrete compressive strengths ranging from 17.6 MPa to 51.5 MPa and cross-sectional side lengths ranging from 90 mm to 400 mm. The proposed stress-strain model is composed of three main components: (1) a monotonic stress-strain model for the envelope curve of cyclic response; (2) a parabolic expression for the unloading path; and (3) a straight line for the reloading path. The model also considers the effects of key parameters including cross-sectional size, aspect ratio, effective rupture strain of the CFRP, and internal longitudinal and hoop steel reinforcement. The performance of the model is finally verified through comparison of predictions made by this model with selected test results, as well as the predictions of more than 20 models of other researchers.