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通过室内模拟试验,研究混合侵蚀溶液、冻融循环与持续荷载耦合作用下,钢筋混凝土梁斜截面承载力和刚度退化、斜截面破坏形态等规律。试验结果表明,预加载比例对侵蚀和冻融环境下钢筋混凝土梁斜截面承载力影响明显,梁的刚度和延性退化程度与箍筋锈蚀和剪压区混凝土劣化有关。最后,给出混合侵蚀、冻融与持续荷载耦合作用下钢筋混凝土梁斜截面承载力计算方法。
Through indoor simulation test, the law of bearing capacity and stiffness degradation of inclined section of reinforced concrete beam and failure mode of oblique section under mixed erosion solution, freeze-thaw cycle and continuous load coupling are studied. The experimental results show that the preloading ratio has a significant influence on the bearing capacity of RC beams under erosion and freezing-thawing conditions. The degradation of ductility and ductility of the beams is related to the corrosion of stirrups and the deterioration of concrete in the shear zone. Finally, the calculation method for the bearing capacity of RC beams under the coupling of mixed erosion, freeze-thaw and continuous load is given.