中文摘要：

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。

英文摘要：

The simulative experiment was carried out for researching the degradation rule of shear strength,deformation,stiffness and failure mechanism of the reinforced concrete beams under the action of different persistent loading and freeze-thaw cycles and mixed aggressive solution.The conclusion indicate that persistent loading influence the shear capacity of RC beams observably,and the degradation of stiffness and ductility of RC beams arise in part from stirrup corrosion and concrete deterioration in shear-compression zone.Calculation mehtod of shear strength of RC beam under the alternative action of freeze-the cycles and mixed aggressive solution based on the experiment data was also proposed.