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针对现有规范中对于钢筋混凝土结构刚度计算公式没有考虑锈蚀这一因素,该文改进了规范公式,提出了钢板加固锈蚀梁刚度计算的方法,进而推导出挠度计算公式。制作了9片钢板加固锈蚀梁,通过静载试验结果,验证了计算方法的正确性,同时通过分析不同锈蚀率、不同钢板厚度对于挠度值的影响,进而探究两因素对于刚度的影响。试验和理论分析结果表明:锈蚀率对于刚度的降低是有限的,当钢板厚度达到6 mm,锈蚀率达到30%后,挠度变化将减小,同时,锈蚀率的大小对于刚度的影响比钢板厚度大。
In view of the fact that the formula for calculating the stiffness of reinforced concrete structures does not consider the factor of corrosion in the existing code, this paper improves the standard formula and proposes the method of calculating the stiffness of the corrosion beam strengthened by steel plate, and then deduces the formula of deflection. Through the static load test results, the correctness of the calculation method is verified. At the same time, by analyzing the influence of different corrosion rates and different steel plate thickness on the deflection, the influence of two factors on the stiffness is explored. The experimental and theoretical analysis results show that the corrosion rate is limited for the decrease of the stiffness. When the thickness of the steel plate reaches 6 mm and the corrosion rate reaches 30%, the deflection change will decrease. Meanwhile, the influence of the corrosion rate on the rigidity is smaller than the steel plate thickness Big.