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为研究酸雨侵蚀环境中RC框架梁的抗震性能,设计了3组不同剪跨比(剪跨比分别为5.0、4.2、3.4)的RC框架梁,采用人工气候盐雾箱对其进行酸雨环境(pH值为3.0)加速侵蚀试验,随后对其进行拟静力试验,分析了不同酸雨酸化深度下的钢筋锈蚀程度和剪跨比对RC框架梁抗震性能的影响。结果表明:在酸雨溶液中的H~+和SO_4~(2-)的共同侵蚀作用下,RC框架梁混凝土表面出现坑蚀小洞,且蚀洞随着侵蚀程度的增加而逐渐加重;当酸化深度小于混凝土保护层厚度时,RC框架梁的承载力和延性略有增加;随着酸雨侵蚀程度的加深,相同剪跨比的试件,其破坏状态由弯曲破坏转变为以弯曲变形为主的弯剪破坏,当纵筋锈蚀率为6.5%时,承载力下降了17.6%,延性降低了5.24%,累积耗能减少30.87%;当钢筋锈蚀程度相近时,试件的弯剪破坏形态随着剪跨比的减小逐渐明显,承载力增大,延性和耗能能力随之减小。
In order to study the seismic behavior of RC frame beams in an acid rain eroded environment, three RC frame beams with different shear-span ratios (shear span ratios of 5.0, 4.2, and 3.4, respectively) were designed and their weather conditions were analyzed using an artificial climate salt spray tank pH value of 3.0) accelerated corrosion test, followed by quasi-static test to analyze the degree of acid corrosion under different acid rain depth and shear span ratio of RC frame beam seismic performance. The results show that pitting corrosion holes appear on the RC frame beam concrete surface under the common erosion of H ~ + and SO_4 ~ (2-) in acid rain solution, and the corrosion pits increase with the increase of erosion degree. When acidification When the depth is less than the thickness of concrete cover, the bearing capacity and ductility of RC frame beam increase slightly. With the deepening of acid rain erosion, the failure state of specimen with the same shear-span ratio changes from bending failure to bending deformation When the corroded rate of longitudinal reinforcement is 6.5%, the bearing capacity decreases by 17.6%, the ductility decreases by 5.24% and the accumulated energy consumption decreases by 30.87% The shear-span ratio decreases obviously, the bearing capacity increases, ductility and energy dissipation capacity decreases.