| 长期负载下CFRP约束混凝土圆柱轴压试验研究 |
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| 引用本文： | 潘毅,吴晓飞,万里,袁双.长期负载下CFRP约束混凝土圆柱轴压试验研究[J].西南交通大学学报,2016,29(5):847-854. |
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| 作者姓名： | 潘毅 吴晓飞 万里 袁双 |
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| 基金项目： | 国家自然科学基金资助项目（51108389）国家留学基金资助项目（20123022） |
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| 摘 要： | 为探讨长期负载下混凝土的收缩徐变和CFRP（碳纤维布）徐变对CFRP约束混凝土柱轴向受压性能的影响，在3种不同加载模式下对12个圆柱进行了长期负载轴压试验，研究了在不同加载模式和不同负载水平下试件的破坏特征及长期荷载对约束柱变形、峰值点应力和应变的影响。试验结果表明:CFRP包裹后的试件均是由于纤维环向拉断导致柱子最终丧失承载力，且CFRP拉断位置一般集中分布在试件的中部附近；在长期荷载作用下，CFRP包裹后的试件比未包裹试件的长期变形要小，并随负载水平的提高，试件的长期变形增大；在不同加载模式下，长期负载对峰值点应力、应变的影响各不相同；初始负载对峰值点应力、应变的影响随负载水平的提高而增大，在负载水平较高时，峰值点应力降低约13%，峰值点应变降低约6%。
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| 关 键 词： | CFRP 约束混凝土柱 长期负载 徐变 |
| 收稿时间： | 2015-03-28 |
Experimental Study on Axially Loaded Circle-Section Concrete Columns Confined by CFRP under Long-Term Load |
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| PAN Yi,WU Xiaofei,WAN Li,YUAN Shuang.Experimental Study on Axially Loaded Circle-Section Concrete Columns Confined by CFRP under Long-Term Load[J].Journal of Southwest Jiaotong University,2016,29(5):847-854. |
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| Authors: | PAN Yi WU Xiaofei WAN Li YUAN Shuang |
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| Abstract: | In order to analyze the effect of creep in concrete and CFRP(Carbon Fiber Reinforced Plastic)on the axial compressive behavior of CFPP confined concrete column under the sustained load, a total of twelve circular columns specimens were tested under three types of the long-term axial load modes. The failure characteristics of specimens were observed and the influence of sustained load on the deformation, the peaks of the strain and the stress of CFPP confined concrete columns were studied under different load modes and ratio of sustained load. The experimental results show that all of the CFRP confined columns lose carrying capacity due to the rupture of CFRP in loop direction, and the position of rupture generally locates at the mid-height of concrete column. The axial strain of CFRP confined concrete is smaller than that of unconfined specimens, and the deformation increases with the load magnitude. Under different sustained load types, the long-term axial preload have different effects on peak stress and peak strain of CFRP confined concrete. In general, the peaks of the stress and strain of concrete decrease along with the increment of the ratio of sustained load. When the ratio of sustained load is relatively high, peak stress and strain will decrease about 13% and 6% , respectively. |
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