In cold environment, the damage of freezing and thawing poses a great threat to the safety of concrete structures. In this study, six frost-damaged squat reinforced concrete (RC) shear walls were subjected to low cyclic reversal loading to investigate the effects of axial compression ratio, concrete strength and freeze-thaw cycles (FTCs) on the seismic performance of squat RC shear walls. The seismic behavior of the test specimens was evaluated in terms of the frost action at the microstructure level, frost-heave crack patterns, damage processes, failure patterns, hysteretic behaviors, skeleton curves, deformations, and energy dissipation capacities. It shows that the boundary elements and distributed reinforcements had obvious restraining effects on the development of frost-heave cracks. The FTC action weakened the load-carrying capacity, energy dissipation capacity, and shear resistance capacity of the walls. When the number of FTCs is kept at 200, with the increase of the concrete strength, the gel structure (C-S-H) gradually evolved from fibrous to nets, also the width and number of frost-heave cracks started to reduce, and the distribution of frost-heave cracks evolved from the middle of the specimen to the perimeter. Moreover, the energy dissipation capacity and the ratio of the shear displacement on the whole displacement after cracking loading condition started to increase.

中文翻译：

---

人工气候环境下冻害蹲式钢筋混凝土剪力墙的抗震性能：进一步的实验研究

在寒冷的环境中，冻融的破坏对混凝土结构的安全性构成了极大的威胁。在这项研究中，对六个冻害的蹲式钢筋混凝土剪力墙进行低周向反向荷载，以研究轴向压缩比，混凝土强度和冻融循环（FTC）对蹲式钢筋混凝土剪力的抗震性能的影响。墙壁。根据微观结构水平的霜冻作用，霜冻裂纹模式，破坏过程，破坏模式，滞后行为，骨架曲线，变形和能量耗散能力，评估了试样的抗震性能。结果表明，边界元和分布的钢筋对冻胀裂缝的发展具有明显的抑制作用。FTC行动削弱了承载能力，能量耗散能力和墙体的抗剪能力。当FTC的数量保持在200时，随着混凝土强度的增加，凝胶结构（CSH）从纤维逐渐演化为网状，冻胀裂纹的宽度和数量也开始减少，霜冻的分布-从试样的中间到周边逐渐形成裂纹。此外，开裂载荷条件后的能量耗散能力和剪切位移在整个位移上的比率开始增加。冻胀裂纹的分布从试样的中部向周边扩展。此外，开裂载荷条件后的能量耗散能力和剪切位移在整个位移上的比率开始增加。冻胀裂纹的分布从试样的中部向周边扩展。此外，开裂载荷条件后的能量耗散能力和剪切位移在整个位移上的比例开始增加。