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An Experimental Study on Flexural Property of Damaged Concrete Beams Reinforced with High Ductile Concrete
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摘要: 高延性混凝土（HDC）具有良好的延性、黏结性能和耐损伤性能，利用其加固受损混凝土梁不仅能提高梁的承载力还能阻止其裂缝的进一步发展。使用HDC进行面层加固，对5个HDC加固震损混凝土梁进行受弯性能试验，研究HDC加固震损混凝土梁的承载能力和变形能力及混凝土内部损伤情况。试验结果表明：利用HDC加固的震损混凝土梁承载力和变形能力较加固前得到了大幅度提高，RCL1~RCL5加固后承载力分别提高86.1%、75.7%、56.0%、84.4%和65.7%；其初始裂缝对应荷载分别提高36.4%、86.6%、64.3%、28.9%和29.7%。HDC加固震损混凝土梁破坏前后对比，表明HDC发挥了良好的黏结性能和耐损伤性能，原有混凝土和HDC能够共同受力，协同变形。基于HDC加固震损混凝土梁的受弯性能研究，给出了HDC加固震损混凝土梁受弯承载力计算公式，计算结果与试验结果相吻合。Abstract: High ductile concrete (HDC) has positive ductility, bond property, and damage resistance feature. Therefore, it can be used to reinforce damaged concrete beams, which can not only improve the bearing capacity of the beams, but also prevent the further development of cracks. This paper used HDC for surface reinforcement, tested the flexural property of five earthquake-damaged concrete beams reinforced with HDC, and studied the bearing and deformation capacity of the earthquake-damaged concrete beams reinforced with HDC, as well as the internal damage of the concrete. The experimental results show that the bearing capacity and deformation capacity of the earthquake-damaged concrete beams reinforced with HDC are greatly improved. The bearing capacity of reinforced RCL1-RCL5 is increased by 86.1%, 75.7%, 56.0%, 84.4%, and 65.7%, respectively, and the corresponding load of the initial crack is increased by 36.4%, 86.6%, 64.3%, 28.9%, and 29.7%, respectively. By comparing the earthquake-damaged concrete beams reinforced with HDC before and after the failure, this paper finds that HDC has shown positive bond and damage resistance properties, and both the original concrete and HDC are subjected to forces and deform. According to the study on the flexural property of earthquake-damaged concrete beams reinforced with HDC, the calculation formula of the flexural capacity of the earthquake-damaged concrete beams reinforced with HDC is deduced, and the calculated results agree with the experimental ones.
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