氯盐侵蚀作用下TRC加固二次受力RC梁的弯曲性能（英文）

Bending performance of TRC-strengthened RC beams with secondary load under chloride erosion

纤维编织网增强混凝土(Textile Reinforced Concrete, TRC)具有良好的承载、限裂和耐腐蚀的能力,适用于海洋严酷环境下混凝土结构的修复加固。本文采用四点弯曲加载的方式,分析了盐水浓度、损伤程度、环境和荷载耦合作用等因素对TRC加固二次受力梁弯曲性能的影响。研究结果表明:随着盐水浓度的增加,梁的裂缝宽度和跨中挠度发展较快,承载力有所降低;随着损伤程度的增大,梁前期裂缝和跨中挠度的发展受影响较小,而其极限承载力有较大的降幅;此外,环境和荷载耦合作用对二次受力梁有明显的影响。随着持载水平的增大,加固梁的极限承载力有所降低,加载后期梁的裂缝发展较快。受持载腐蚀时的初始挠度的影响,在同级加载下梁的跨中挠度有所降低。

Textile reinforced concrete(TRC)has good bearing capacity,crack resistance and corrosion resistance and it is suitable for repairing and reinforcing concrete structures in harsh marine environments.The four-point bending method was used to analyze the influence of the salt concentration,the damage degree and the coupled effect of the environment and load on the bending performance of TRC-strengthened beams with a secondary load.The results showed that as the salt concentration increased,the crack width and mid-span deflection of the beam quickly increased,and its bearing capacity decreased.As the damage degree increased,the early-stage crack development and mid-span deflection of the beam were less affected and the ultimate bearing capacity significantly decreased.In addition,the coupled effect of the environment and load on the beams with a secondary load was significant.As the sustained load increased,the ultimate bearing capacity of the strengthened beam decreased,and cracks developed faster in the later stage.In addition,the mid-span deflection of the beam decreased at the same load level because of the influence of the initial deflection due to the sustained load corrosion.