| 马辉*,贾晨俊,吴亚楠,贾梦璐,黄成.碳纤维条带约束型钢再生混凝土短柱轴压性能试验研究[J].实验力学,2021,36(5):655~667 |
| 碳纤维条带约束型钢再生混凝土短柱轴压性能试验研究 |
| Experimental study on axial compression behavior of steel reinforced recycled concrete short columns confined by CFRP strips |
| 投稿时间：2020-09-10 修订日期：2020-11-18 |
| DOI：10.7520/1001-4888-20-186 |
| 中文关键词: CFRP约束再生混凝土 型钢再生混凝土 短柱 轴压性能 承载力计算 |
| 英文关键词:CFRP confined recycled concrete steel reinforced recycled concrete short column axial compression performance bearing capacity calculation |
| 基金项目:国家自然科学基金项目(51408485);陕西省自然科学基础研究计划项目(2019JM-193);陕西省住房城乡建设科学技术计划项目(2015-K129) |
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| 中文摘要: |
| 为研究碳纤维(CFRP)条带约束型钢再生混凝土短柱的轴压性能，对9根短柱进行了轴心受压加载试验，分析了试件的破坏特征、荷载-位移曲线、荷载-应变曲线、横向变形系数等性能指标，研究了再生粗骨料取代率、CFRP条带间距、CFRP条带宽度以及再生混凝土强度等参数对试件轴压性能的影响。结果表明：短柱破坏模式为内部型钢先达到屈服状态，随后纵筋、箍筋相继屈服，再生混凝土被压溃，最后CFRP条带拉断，导致试件丧失承载力而发生破坏。再生粗骨料取代率对试件轴压承载力影响较小，最大降幅仅为4.8%；增加CFRP条带宽度或减小CFRP条带间距可以提高构件轴压承载力，最大增幅分别为10.5%和11.4%；提高再生混凝土的强度对构件轴压承载力是有利的。CFRP条带约束下型钢再生混凝土柱的承载力和延性均得到了一定程度的提高。在此基础上，考虑CFRP条带的约束作用和再生骨料的不利影响，本文提出了CFRP条带约束型钢再生混凝土短柱的轴压承载力计算公式。 |
| 英文摘要: |
| To study the axial compression behavior of steel reinforced recycled concrete (SRRC) short columns confined by CFRP strips, nine short columns confined by CFRP strips were tested under axial compression. The failure feature of all specimens, the load-displacement curves, the load-strain curves and the transverse deformation coefficient were obtained and analyzed. The effects of the replacement ratio of recycled coarse aggregate, the spacing of CFRP strips, the width of CFRP strips and the strength of recycled concrete on the axial compression properties of specimens were studied. The test results show that: the failure characteristics of the short column can be described as that the internal section steel first reaches the yield state, then the longitudinal reinforcement and stirrup yield successively, the recycled concrete is crushed, and finally the carbon fiber strip is broken, resulting in the failure of the specimen. The replacement rate of recycled coarse aggregate has little effect on the bearing capacity of specimens under axial compression, and the maximum decrease is only 4.8%; increasing the strip width or decreasing the strip spacing can improve the bearing capacity of short columns, and the maximum increase is 10.5% and 11.4%, respectively; it is beneficial to improve the strength of recycled concrete for the axial compression bearing capacity of specimens. The bearing capacity and ductility of steel reinforced recycled concrete columns confined by CFRP strips have been improved to a certain extent. On this basis, considering the restraint effect of CFRP strips and the adverse effects of recycled aggregate, a formula for calculating the axial bearing capacity of RAC short columns confined by CFRP strips is proposed. |
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