氯盐干湿循环下TRC加固钢筋混凝土柱轴心受压性能  

Axial Compression Performance of Reinforced Concrete Column Strengthened with TRC Under Chloride Dry-wet Cycles

作　　者：尹世平[1,2] 李耀[2] 李贺东[3] 彭驰[2] 艾珊霞[2] YIN Shi-ping LI Yao LI He-dong PENG Chi AI Shan-xia(State Key Laboratory for Geomechanics ~ Deep Underground Engineering, China Universily of Mining and Technology, Xuzhou 221008, Jiangsu, China Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China Institute of Advanced Engineering Structures and Materials, Zhejiang University, Hangzhou 310058, Zhejiang, China)

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008 [2]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,江苏徐州221116 [3]浙江大学高性能建筑结构与材料研究所,浙江杭州310058

出　　处：《中国公路学报》2017年第6期230-238,共9页China Journal of Highway and Transport

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)

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。In order to further investigate the compression behavior of reinforced concrete （RC） columns strengthened with textile rein{orced concrete （TRC） under dry-wet cycles of chloride salt, the axial compression test on 12 RC columns strengthened with TRC was carried out. The influences of different numbers （0, 60, 90 and 120） of dry-wet cycles, sustained load ratios （0, 0.1, 0.2 and 0.4）, coupling effects of dry-wet cycles of chloride salt and sustained load were analyzed as well as the modified high-performance concrete with short-cut fibers on reinforcement effect of TRC were analyzed. The results show that the ultimate bearing capacity and deformation properties of TRC-strengthened columns tend to decrease under dry-wet cycles. After 120 times of dry-wet cycles, the ultimate bearing capacity of the TRC-strengthened column decreases by 6.71~. Compared with the single dry-wet cycle, the deformation and bearing capacities of TRC- strengthened columns decrease dramatically under coupling effects of dry-wet cycles of chloride salt and sustained load. When 90 dry-wet cycles remain constant, with the increase of the sustained load ratio, the reinforcement effect of TRC decreases. With the increase of coupling effects of both dry-wet cycling and sustained load, the failure pattern of the TRC-strengthened column may be changed. The modified high-performance concrete with short-cut PVA fibers, taken as matrix of TRC, contributes to improve the durability of RC columns. A simplified formula is given to describe the ultimate bearing capacity of the axial compression of RC columns reinforced with TRC. The calculated value is congruent with the experimental one.

关 键 词：桥梁工程 纤维编织网增强混凝土 轴心受压 承载能力 钢筋混凝土柱 干湿循环 

分 类 号：U441[建筑科学—桥梁与隧道工程]