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为研究受损钢筋混凝土梁采用粘贴钢板加固方法后承载力的变化,制作了2根混凝土梁试件.首先将试验梁加载开裂至正常损伤状态并测量对应的最大裂缝宽度,然后将其中一根梁按照规范设计方法进行加固处理,随后对试验梁进行抗弯承载力试验.在试验中通过采集应变、挠度和裂缝宽度等数据,综合评价钢板加固方法的效果.并通过比较各种材料应变随荷载的发展曲线,分析钢筋应变与钢板应变变化协同关系,验证平截面假定是否成立,最后通过各规范所提供的设计方法,将计算结果与试验结果进行对比分析.结果证明:粘贴钢板加固方法对提高受损钢筋混凝土梁的抗弯承载力具有显著效果,加固梁相对于未加固梁承载力提高58.2%;通过试验数据与规范计算结果的对比,可认为现有设计方法具有一定的安全性.研究内容和结果可以为规范公式的使用提供理论依据,也为实际工程钢板加固设计和施工提供参考.
In order to study the change of bearing capacity of damaged RC beams after using the method of bonding steel plate reinforcement, two concrete beam specimens were made. Firstly, the test beam was loaded and cracked to the normal damage state and the corresponding maximum crack width was measured. The beam is reinforced according to the standard design method, and then the test beam is subjected to the flexural capacity test.The effect of the steel plate reinforcement method is comprehensively evaluated by collecting the data of strain, deflection and crack width in the test, Load curve, the synergetic relationship between the strain of steel bar and the strain of steel plate is analyzed to verify whether the assumption of cross-section is valid or not, and finally the calculated results are compared with the test results by the design methods provided in each code.The results show that: Increasing the flexural capacity of damaged RC beams has a significant effect. The load-carrying capacity of RC beams is increased by 58.2% compared with that of un-reinforced beams. The comparison between the experimental data and the standard calculation results shows that the existing design methods have certain safety. The research contents and results can provide theoretical basis and norms for the use of standard formulas Engineering design and construction of steel reinforcement to provide a reference.