现有关于混凝土受酸腐蚀的研究多集中于对混凝土结构在不受荷载或受单调荷载作用下力学行为的探究，为研究盐酸腐蚀环境下在役混凝土构件承受反复荷载时的力学性能变化规律，文中首先设计并制作6组混凝土棱柱体试件，以质量分数为1%的盐酸对试件进行全浸泡加速腐蚀，开展不同腐蚀龄期下混凝土的单调及反复轴压荷载试验，探讨腐蚀对混凝土在反复轴压荷载作用下力学性能的影响；然后提出了有效承载截面积比的概念，引入有效承载面积比的下降段修正系数，建立反复荷载下盐酸腐蚀混凝土的实用本构模型，并对模型进行验证。结果表明：盐酸腐蚀对混凝土破坏特征具有显著影响，荷载作用下腐蚀混凝土表面易剥落，随着荷载递增，表面剥落面积变大；同时，随着腐蚀龄期的增加，抗压强度明显下降，承载能力迅速降低。不同腐蚀龄期混凝土在反复荷载作用下的应力-应变曲线包络线与单调加载基本一致；但由于腐蚀混凝土内部损伤的累积，反复荷载下应力-应变曲线下降段较单调荷载下的斜率更大，破坏较为突然，混凝土的峰值应变较单调荷载下的有所减小，但变化不大。随着盐酸腐蚀龄期的增长，在反复荷载作用下混凝土峰值应变、极限应变明显增大，而峰值应力、弹性模量大幅度下降，相较于未腐蚀混凝土，腐蚀混凝土的实测峰值应力和弹性模量分别下降了53.25%和74.1%，峰值应变和极限应变分别提高了55.7%和77.87%。基于文中建立的模型计算的应力-应变曲线与试验结果吻合良好，该模型具有较好的拟合效果。

Most of the existing studies on acid corrosion of concrete focus on the mechanical behavior of concrete structures without loading or under monotonic loading.In order to study the variation law of mechanical properties of in-service concrete members under cyclic loading，six groups of concrete prism specimens were prepared and immersed in hydrochloric acid of 1%（mass fraction）for accelerated corrosion.The monotonic and cyclic axial compression loading tests were carried out to examine the influence of corrosion on the mechanical properties of concrete under cyclic axial compression loading.Then，the concept of effective load-bearing cross-area ratio was proposed，and the descending correction coefficient of effective load-bearing cross-area ratio was introduced to establish the practical constitutive model of hydrochloric acid corrosion concrete under cyclic loading.And the model was verified.The results show that hydrochloric acid corrosion has a significant effect on the failure characteristics of concrete.The surface of corroded concrete is easy to peel off under loading effects，and the area of spalling enlarges gradually with the increase of loading.Meanwhile，with the increase of corrosion period，the compressive strength reduces of concrete obviously，and the bearing capacity decreases rapidly.The envelope of stress-strain curve of concrete with different corrosion ages under cyclic loading is basically consistent with that of the monotonic loading.However，the degradation rate of descending section for the stress-strain curve of concrete under cyclic loading is larger than that under monotonic loading due to the accumulation of internal damage of corroded concrete，and the failure is relatively more prominent.The peak strain of concrete under cyclic loading is slightly less than that of the monotonic loading.As the continuing increases of the corrosion period，the peak strain and ultimate strain of concrete under cyclic loading increase observably，while the peak stress and elastic modulus decrease significantly.Compared with uncorroded concrete，the test peak stress and elastic modulus of corroded concrete decreases by 53.25% and 74.1%，respectively，and meanwhile the peak strain and ultimate strain increased by 55.7% and 77.87%，respectively.The stress-strain curves calculated by using the model established in this paper match well with the test results，indicating the desirable fitting effect of the model.