力与氯盐侵蚀耦合作用下TRC叠合梁的力学性能退化研究
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摘要
使用预制织物增强混凝土(TRC)永久性模板制作叠合梁构件,并采用电化学侵蚀方法,加速侵蚀,继而开展抗弯试验,分析了2根对比梁和5根TRC叠合梁在氯盐侵蚀作用下溶液浓度、持荷状态、锈蚀率的不同对TRC叠合梁受弯性能的影响.结果表明:锈蚀状态下TRC叠合梁的力学性能退化情况优于普通梁;U型TRC梁模可以阻碍氯离子的渗入,延缓梁内钢筋锈蚀;溶液浓度的提高、钢筋锈蚀率的增大是影响TRC叠合梁承载力下降的直接因素;在较小的锈蚀率下,TRC叠合梁的屈服荷载和极限荷载略有提升.在试验分析的基础上,给出了TRC叠合梁在锈蚀状态下的承载力计算公式,理论计算结果与试验结果较为吻合.
Prefabricated fabric reinforced concrete permanent formwork was used to make composite beams. The method of electrochemical corrosion was used to accelerate the erosion of composite beams,and then the bending test was carried out. In the experiment,2 contrast beams and 5 TRC composite beams were analyzed. Analysis shows the impact of different solution concentration,holding states and corrosion rates on the bending behavior of composite beams under the action of chloride erosion. The results showed that the degradation of mechanical properties of TRC composite beams under corrosion condition is better than that of ordinary beams. The TRC type U beam model can prevent the infiltration of chloride ions and delay the corrosion of steel bars in the beam; the increase of the concentration of the solution and the increase of the corrosion rate of the steel bar are the direct factors that affect the bearing capacity of the TRC composite beam; The yield load and ultimate load of the TRC composite beam are slightly increased at a low corrosion rate. Based on the analysis of the experimental phenomena,the formula of the bearing capacity of TRC composite beam under corrosion condition is given,and the theoretical calculation results are in good agreement with the experimental results.
Prefabricated fabric reinforced concrete permanent formwork was used to make composite beams. The method of electrochemical corrosion was used to accelerate the erosion of composite beams,and then the bending test was carried out. In the experiment,2 contrast beams and 5 TRC composite beams were analyzed. Analysis shows the impact of different solution concentration,holding states and corrosion rates on the bending behavior of composite beams under the action of chloride erosion. The results showed that the degradation of mechanical properties of TRC composite beams under corrosion condition is better than that of ordinary beams. The TRC type U beam model can prevent the infiltration of chloride ions and delay the corrosion of steel bars in the beam; the increase of the concentration of the solution and the increase of the corrosion rate of the steel bar are the direct factors that affect the bearing capacity of the TRC composite beam; The yield load and ultimate load of the TRC composite beam are slightly increased at a low corrosion rate. Based on the analysis of the experimental phenomena,the formula of the bearing capacity of TRC composite beam under corrosion condition is given,and the theoretical calculation results are in good agreement with the experimental results.
引文
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[12]尹世平,盛杰,吕恒林,等.TRC加固RC梁在静载下的受弯性能[J].中国公路学报,2015(1):45-53.YIN Shiping,SHENG Jie,LU Henglin,et al.Flexural behavior of RC beams strengthened with TRC under static loading[J].China Journal of Highway and Transport,2015(1):45-53.(in Chinese)
[13]徐业辉,李彬,荀勇.织物增强混凝土薄板加固钢筋混凝土梁的二次受弯性能试验研究[J].工业建筑,2015(1):173-178.DOI:10.13204/j.gyjz201501035.XU Yehui,LI Bin,XUN Yong.Experimental research on secondary bending behavior of reinforced concrete beams strengthened with textile reinforced concrete sheets[J].Industrial Construction,2015(1):173-178.DOI:10.13204/j.gyjz201501035.(in Chinese)
[14]徐业辉.织物增强混凝土永久性模板及其钢筋混凝土叠合梁的抗弯性能试验研究[D].镇江:江苏大学,2015.
[2]SCHNEIDER H N,BERGMANN I.The application potential of textile-reinforced concrete[C]//Textile-Reinforced Concrete.Farmington Hills:American Concrete Institute,2008:7-22.
[3]WEILAND S,ORTLEPP R,HAUPTENBUCHNER B,et al.Textile-reinforced concrete for flexural strengthening of RC-structures-part2:application on a concrete shell[C]//Textile-Reinforced Concrete.Farmington Hills:American Concrete Institute,2008:41-58.
[4]吴庆,曹俊镐,陈小健.氯盐和硫酸盐侵蚀下RC梁受弯性能分析[J].江苏科技大学学报(自然科学版),2013,27(4):322-325.DOI:10.3969/j.issn.1673-4807.2013.04.004.WU Qing,CAO Junhao,CHEN Xiaojian.Analysis of bending behavior of RC beams corroded by sulfate and chloride[J].Journal of Jiangsu University of Science and Technology(Natural Science Edition),2013,27(4):322-325.DOI:10.3969/j.issn.1673-4807.2013.04.004.(in Chinese)
[5]张勤.织物增强混凝土(TRC)加固RC梁正截面抗弯性能试验研究[D].镇江:江苏大学,2009.
[6]荀勇,支正东,张勤.织物增强混凝土薄板加固钢筋混凝土梁受弯性能试验研究[J].建筑结构学报,2010,31(3):70-76.XUN Yong,ZHI Zhengdong,ZHANG Qin.Experimental research on flexural behavior of reinforced concrete beams strengthened with textlile reinforced concrete sheets[J].Journal of Building Structures,2010,31(3):70-76.(in Chinese)
[7]荀勇,尹红宇,肖保辉.织物增强混凝土加固RC梁的斜截面抗剪承载力试验研究[J].2012,45(5):58-64.DOI:10.15951/j.tmgcxb.2012.05.019.XUN Yong,YIN Hongyu,XIAO Baohui.Experimental study on shear capacity of RC beams strengthened with textile reinforced concrete[J].China Civil Engineering Journal,2012,45(5):58-64.DOI:10.15951/j.tmgcxb.2012.05.019.(in Chinese)
[8]牛荻涛.混凝土结构耐久性与寿命预测[M].北京:科学出版社,2003.
[9]吴庆,庄悦.锈蚀钢筋混凝土梁抗弯承载力计算方法[J].混凝土,2011(8):10-14.DOI:10.3969/j.issn.1002-3550.2011.08.004.WU Qing,ZHUANG Yue.Calculation method for flexural capacity of corroded RC beams Reinforced concrete beams[J].Concrete,2011(8):10-14.DOI:10.3969/j.issn.1002-3550.2011.08.004.(in Chinese)
[10]CAURNS J.Strength of concrete beams during concrete breakout[J].I-ABSE Symposium on Extending the lifespan of Structures.San Francisco,1995:500-504.
[11]尹世平,徐世烺.钢筋与纤维编织网联合增强细粒混凝土梁的弯曲试验与理论研究[J].工程力学,2011,28(1):87-95.YIN Shiping,XU Shilang.Experimental and theoretical investigation on the flexural behavior of fine grained concrete beam reinforced with textile-combined steel[J].Engineering Mechanics,2011,28(1):87-95.(in Chinese)
[12]尹世平,盛杰,吕恒林,等.TRC加固RC梁在静载下的受弯性能[J].中国公路学报,2015(1):45-53.YIN Shiping,SHENG Jie,LU Henglin,et al.Flexural behavior of RC beams strengthened with TRC under static loading[J].China Journal of Highway and Transport,2015(1):45-53.(in Chinese)
[13]徐业辉,李彬,荀勇.织物增强混凝土薄板加固钢筋混凝土梁的二次受弯性能试验研究[J].工业建筑,2015(1):173-178.DOI:10.13204/j.gyjz201501035.XU Yehui,LI Bin,XUN Yong.Experimental research on secondary bending behavior of reinforced concrete beams strengthened with textile reinforced concrete sheets[J].Industrial Construction,2015(1):173-178.DOI:10.13204/j.gyjz201501035.(in Chinese)
[14]徐业辉.织物增强混凝土永久性模板及其钢筋混凝土叠合梁的抗弯性能试验研究[D].镇江:江苏大学,2015.
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