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Research on the Flexural Performance of RC Beams Under Coupling of Flexural Loads and Acid-Alkali Dry-Wet Cycles
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摘要: 为了得到养殖场环境下混凝土结构抗弯性能的影响规律，通过模拟真实养殖场环境，以腐蚀环境类型、腐蚀循环时间和初始裂缝宽度作为变量，开展弯曲荷载及酸-碱干湿循环耦合作用下钢筋混凝土（RC）梁的抗弯性能试验研究。通过四点弯曲试验得到试验现象、裂缝分布情况和荷载-跨中挠度曲线，对比分析得到各试验变量对抗弯性能的影响规律。研究结果表明：所有试件都呈延性破坏；酸性干湿循环对试件极限承载能力有一定增强，但削弱了其变形能力，碱性干湿循环对试件抗弯能力的影响不大，酸-碱干湿循环轻微降低了试件的极限荷载，但较大降低了试件的变形能力；初始裂缝的存在对试件屈服荷载和极限荷载有一定降低，对试件的变形能力有一定影响；酸-碱干湿循环时间的增长降低了试件的变形能力，并对45 mm保护层厚度试件的刚度和变形能力影响较大。Abstract: In order to obtain the influence law of livestock farm environment on the flexural performance of concrete structures, the experimental study of flexural performance of reinforced concrete (RC) beams under the coupling effect of bending load and acid-alkali dry-wet cycles was carried out by simulating the real livestock farm environment with the type of corrosive environment, corrosion cycle time and initial crack width as variables. The test phenomena, crack distribution and load-midspan deflection curves were obtained by the four-point bending tests, and the influence laws of each test variable on the flexural performance were compared and analyzed. The results showed that:all specimens were ductile failure; acid dry-wet cycles could enhance the ultimate bearing capacity of the specimen but weaken its deformation capacity, alkaline dry-wet cycles had little effect on the flexural capacity of the specimen, acid-alkali dry-wet cycles slightly reduced the ultimate load of the specimen, while greatly reducing the deformation capacity; the presence of initial cracks reduced the yield and ultimate load of the specimen, had a certain effect on the deformation capacity of the specimen; the increase in acid-alkali wet-dry cycle time decreased the deformation capacity of the specimen and had a greater effect on the stiffness and deformation capacity of the specimen with 45 mm protective layer thickness.
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