Experimental testing and analytical modeling of CFRP-confined large circular RC columns subjected to cyclic axial compression
Experimental testing and analytical modeling of CFRP-confined large circular RC columns subjected to cyclic axial compression
复制标题
受循环轴压作用的 CFRP 约束大型圆形 RC 柱的实验测试和分析模型
DOI：
10.1016/j.engstruct.2012.01.004
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发表时间：
2012-07
影响因子：
5.5
通讯作者：
Lu Dagang
中科院分区：
文献类型：
--
作者：
Wang Zhenyu;Wang Daiyu;Smith Scott;Lu Dagang
一个物理信息分析模型描述了纤维增强聚合物（FRP）复合材料包裹的钢筋混凝土（RC）柱的循环轴向应力-应变行为，对于此类柱的非线性分析和抗震设计是必要的。尽管人们对小型 FRP 约束无筋混凝土柱的单调轴向行为进行了广泛的研究，但缺乏对 FRP 约束 RC 柱及其循环轴向响应的研究。因此，缺乏能够通过数值手段可靠地模拟地震响应的循环轴向应力-应变模型。由于这种知识差距，本研究报告了 30 个 CFRP 约束的大型无筋和 RC 圆柱承受单调和循环轴向压缩载荷的结果。试验结果表明，CFRP 约束混凝土的应力-应变曲线的整体形状、峰值压应力和破坏应变、卸载/再加载路径以及 CFRP 约束混凝土的塑性应变均受到 CFRP 包裹层和内部箍筋的影响。根据实验结果，提出了 CFRP 约束圆形 RC 柱的循环应力-应变模型。所提出的模型由三个主要部分组成，即（i）描述包络曲线的单调上升部分，（ii）描述卸载路径的多项式方程，以及（iii）描述重新加载路径的直线。还考虑了内部箍筋对单调模型以及卸载和重新加载响应的影响。使用本文报告的测试数据以及从公开文献中提取的其他相关测试结果验证了所提出模型的准确性。
A physically informed analytical model which describes the cyclic axial stress–strain behavior of reinforced concrete (RC) columns confined with fiber-reinforced polymer (FRP) composite wraps is necessary for the non-linear analysis and seismic design of such columns. Although extensive studies have been conducted on the monotonic axial behavior of small sized FRP-confined unreinforced concrete columns, there is a lack of research on FRP-confined RC columns and also their cyclic axial response. As a consequence, there is a lack of cyclic axial stress–strain models which can enable seismic response to be reliably simulated by numerical means. Due to such knowledge gaps, this study reports the results of thirty CFRP-confined large-scale unreinforced and RC circular columns subjected to monotonic and cyclic axial compression loading. The test results indicate that the overall shape of the stress–strain curves, the peak compressive stress and strain at failure, the unloading/reloading paths, and also the plastic strain of CFRP-confined concrete are influenced by the CFRP wrap and internal hoop steel reinforcement. On the basis of the experimental results, a cyclic stress–strain model for CFRP-confined circular RC columns is then proposed. The proposed model consists of three main components, namely (i) a monotonically ascending portion to describe the envelope curve, (ii) a polynomial equation to describe unloading paths, and (iii) a straight line to describe reloading paths. The influence of internal hoop reinforcement on the monotonic model, as well as the unloading and reloading responses is also considered. The accuracy of the proposed model is validated with the test data reported in this paper as well as other test results of relevance extracted from the open literature.
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影响因子：
10.5
作者：
Y. Shao;Z. Zhu;A. Mirmiran
通讯作者：
Y. Shao;Z. Zhu;A. Mirmiran
DOI：
10.1061/(asce)0733-9445(1988)114:8(1804
发表时间：
1988-08-01
期刊：
JOURNAL OF STRUCTURAL ENGINEERING-ASCE
影响因子：
--
作者：
MANDER, JB;PRIESTLEY, MJN;PARK, R
通讯作者：
PARK, R
影响因子：
4.6
作者：
Carlo Pellegrino;C. Modena
通讯作者：
Carlo Pellegrino;C. Modena
影响因子：
1.8
作者：
M. Chajes;Ted F. Januszka;D. Mertz;T. A. Thomson;W. Finch
通讯作者：
M. Chajes;Ted F. Januszka;D. Mertz;T. A. Thomson;W. Finch
影响因子：
4.6
作者：
Cui, C.;Sheikh, S. A.
通讯作者：
Sheikh, S. A.