氯盐干湿循环下TRC加固钢筋混凝土柱轴心受压性能
发布时间：2019-05-18 03:02
【摘要】：为进一步探究纤维编织网增强混凝土(TRC)修复加固钢筋混凝土柱在氯盐侵蚀环境下的受压性能,对12根TRC加固钢筋混凝土柱进行轴心受压性能试验研究,分析了不同干湿循环次数(0,60,90和120)、不同持续荷载比(0,0.1,0.2和0.4)、氯盐干湿循环与持续荷载耦合作用以及短切纤维改性高性能混凝土对TRC加固效果的影响。研究结果表明:干湿循环作用后TRC加固柱的极限承载力及变形性能有下降趋势,在干湿循环作用次数达到120次后,TRC加固柱的极限承载力降低6.71%;相比于单一的干湿循环作用,在氯盐干湿循环与持续荷载耦合作用下,TRC加固柱的变形和承载力下降更多;在干湿循环(90次)不变时,持续荷载比的增加会降低TRC的加固效果;干湿循环与持续荷载耦合作用的增加会改变TRC加固柱的破坏形态;使用短切PVA纤维改性高性能混凝土作为TRC基体加固钢筋混凝土柱会使其耐久性能稍有提高;给出了氯盐干湿循环作用下TRC加固RC柱的轴心受压极限承载力简化计算公式,计算值与试验值吻合较好。
[Abstract]:In order to further investigate the compression performance of reinforced concrete columns strengthened with fiber braided mesh reinforced concrete (TRC) under chloride erosion environment, the axial compression performance of 12 reinforced concrete columns strengthened with TRC was studied. The effects of different dry and wet cycle times (0, 60, 90 and 120), different continuous load ratios (0, 0.1, 0.2 and 0.4), the coupling of chlorine dry and wet cycle and continuous load, and the effect of short cut fiber modified high performance concrete on the reinforcement effect of TRC were analyzed. The results show that the ultimate bearing capacity and deformation performance of TRC reinforced columns decrease after dry and wet cycle. after the number of dry and wet cycles reaches 120 times, the ultimate bearing capacity of TRC reinforced columns decreases by 6.71%. Compared with the single dry and wet cycle, the deformation and bearing capacity of TRC reinforced columns decrease more under the coupling of chlorine dry and wet cycle and continuous load. When the dry-wet cycle (90 times) is constant, the increase of the continuous load ratio will reduce the reinforcement effect of TRC, and the increase of the coupling effect of dry-wet cycle and continuous load will change the failure mode of TRC reinforced column, and the increase of the coupling effect of dry-wet cycle and continuous load will change the failure mode of TRC reinforced column. The durability of reinforced concrete columns strengthened with short cut PVA fiber modified high performance concrete as TRC matrix will be slightly improved. A simplified formula for calculating the ultimate bearing capacity of RC columns strengthened by TRC under dry and wet cycle of chlorine salt is given, and the calculated values are in good agreement with the experimental values.
【作者单位】： 中国矿业大学深部岩土力学与地下工程国家重点实验室;中国矿业大学江苏省土木工程环境灾变与结构可靠性重点实验室;浙江大学高性能建筑结构与材料研究所;
【基金】：国家自然科学基金项目(51478458,51108451) 中国博士后科学基金项目(2014T70559)
【分类号】：TU375.3
[Abstract]:In order to further investigate the compression performance of reinforced concrete columns strengthened with fiber braided mesh reinforced concrete (TRC) under chloride erosion environment, the axial compression performance of 12 reinforced concrete columns strengthened with TRC was studied. The effects of different dry and wet cycle times (0, 60, 90 and 120), different continuous load ratios (0, 0.1, 0.2 and 0.4), the coupling of chlorine dry and wet cycle and continuous load, and the effect of short cut fiber modified high performance concrete on the reinforcement effect of TRC were analyzed. The results show that the ultimate bearing capacity and deformation performance of TRC reinforced columns decrease after dry and wet cycle. after the number of dry and wet cycles reaches 120 times, the ultimate bearing capacity of TRC reinforced columns decreases by 6.71%. Compared with the single dry and wet cycle, the deformation and bearing capacity of TRC reinforced columns decrease more under the coupling of chlorine dry and wet cycle and continuous load. When the dry-wet cycle (90 times) is constant, the increase of the continuous load ratio will reduce the reinforcement effect of TRC, and the increase of the coupling effect of dry-wet cycle and continuous load will change the failure mode of TRC reinforced column, and the increase of the coupling effect of dry-wet cycle and continuous load will change the failure mode of TRC reinforced column. The durability of reinforced concrete columns strengthened with short cut PVA fiber modified high performance concrete as TRC matrix will be slightly improved. A simplified formula for calculating the ultimate bearing capacity of RC columns strengthened by TRC under dry and wet cycle of chlorine salt is given, and the calculated values are in good agreement with the experimental values.
【作者单位】： 中国矿业大学深部岩土力学与地下工程国家重点实验室;中国矿业大学江苏省土木工程环境灾变与结构可靠性重点实验室;浙江大学高性能建筑结构与材料研究所;
【基金】：国家自然科学基金项目(51478458,51108451) 中国博士后科学基金项目(2014T70559)
【分类号】：TU375.3
【参考文献】
相关期刊论文 前10条
1 尹世平;盛杰;贾申;;纤维束编织网增强混凝土加固钢筋混凝土梁疲劳破坏试验研究[J];建筑结构学报;2015年04期
2 尹世平;盛杰;吕恒林;贾申;;TRC加固RC梁在静载下的受弯性能[J];中国公路学报;2015年01期
3 尹世平;盛杰;徐世p，
本文编号：2479616
本文链接：https://www.wllwen.com/jianzhugongchenglunwen/2479616.html
