氯盐侵蚀下TRC加固承载RC受弯梁抗裂性能  

Crack resistance of loaded flexural TRC-strengthened beams under chloride erosion

作　　者：尹世平[1,2] 余玉琳 那明望 YIN Shiping;YU Yulin;NA Mingwang(State Key Laboratory for Geomechanics ＆ Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,China;Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering China University of Mining and Technology,Xuzhou 221116,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221116 [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

出　　处：《水利学报》2018年第7期886-891,共6页Journal of Hydraulic Engineering

基　　金：国家自然科学基金项目(51478458);中国博士后基金项目(2014T70559)

摘　　要：进一步完善对纤维编织网增强混凝土(Textile Reinforced Concrete,TRC)加固受弯梁的研究,考虑了干湿循环及其与弯曲应力耦合作用对TRC加固承载RC梁抗裂性能的影响。采用四点弯曲加载的方式,对加固梁进行分级加载,分析了上述因素对加固梁的裂缝分布及发展情况的影响。研究表明:随着干湿循环次数的增加,TRC的限裂性能有所减弱,裂缝发展加快,最大裂缝宽度增大;随着弯曲应力的增大,梁的延性减弱,裂缝开展加快,最大裂缝宽度增大;承载加固对在较高弯曲应力水平情况下的梁影响较大,弯曲应力越大,对TRC和老混凝土之间的界面性能影响越大,一定程度上影响了TRC的抗裂性能。Further study on the flexural beams strengthened with textile reinforced concrete（TRC） is conducted,considering the influence of dry-wet cycle and its coupling with bending stress on the crack resistance of the loaded TRC-strengthened RC beams. Four-point bending loading method was used for gradedloading to analyze the influence of the above factors on the distribution and development of the crack. Theresults show that with the increase of dry-wet cycle times,the crack resistance of TRC was weakened,thecrack developed faster, and the maximum crack width enlarged; With the increase of bending stress, theductility of beam was weakened, the crack developed faster, and the maximum crack width enlarged; Theload-bearing reinforcement had greater influence on the beam in the condition of higher bending stress,and the greater the bending stress, the greater the influence on the interfacial performance between TRC and old concrete,affecting the crack resistance of TRC.

关 键 词：纤维编织网增强混凝土 干湿循环 弯曲应力 裂缝开展 裂缝宽度 

分 类 号：TU375.1[建筑科学—结构工程]