\r郑山锁，董晋琦，荣先亮，张艺欣，董立国\r
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AuthorsHTML:\r郑山锁，董晋琦，荣先亮，张艺欣，董立国\r
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AuthorsListE:\rZheng Shansuo，Dong Jinqi，Rong Xianliang，Zhang Yixin，Dong Liguo\r
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AuthorsHTMLE:\rZheng Shansuo，Dong Jinqi，Rong Xianliang，Zhang Yixin，Dong Liguo\r
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Unit:\r西安建筑科技大学土木工程学院，西安 710055\r
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Unit_EngLish:\rSchool of Civil Engineering，Xi’an University of Architecture and Technology，Xi’an 710055，China\r
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Abstract_Chinese:\r通过人工气候快速冻融技术仿真混凝土结构所处的冻融环境，制作4 榀剪跨比为2.14 的RC 剪力墙试件进行冻融循环试验，继而采用悬臂梁式加载方案对其进行拟静力加载试验，以研究轴压比变化和冻融循环作用对RC剪力墙承载能力、变形能力、强度衰减、初始刚度、刚度退化以及耗能能力等抗震性能指标的影响规律．结果表明：相同轴压比下，经冻融循环作用后的RC 剪力墙试件加载破损更加严重，其初始刚度、水平承载能力、变形能力和耗能能力均有不同程度的退化，同时，强度衰减幅度、刚度退化速率、不同受力状态下的剪切变形及其占总变形的比例均有不同程度的增大；冻融循环次数相同时，随轴压比的增加，RC 剪力墙试件破坏时裂缝分布范围、墙顶水平承载能力、初始刚度、强度衰减幅度以及刚度退化速率均逐渐增大，而变形能力、耗能能力、不同受力状态下的剪切变形、屈服状态下剪切变形占总变形的比例逐渐降低，在峰值状态下则逐渐增大并逐渐成为主要变形．综合考虑冻融损伤参数D 与轴压比n 对RC 剪力墙峰值荷载与极限位移的影响，通过多参数拟合得到了考虑冻融损伤的RC 剪力墙峰值荷载与极限位移计算式．该研究可为严寒地区以剪力墙为主要抗侧力构件的在役高层建筑结构的性能评估提供参考．\r
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Abstract_English:\rThe freeze-thaw cycle test of four RC shear wall specimens with the shear span ratio of 2.14 was carried out by simulating the actual freeze-thaw environment of concrete structure with artificial climate rapid freeze-thaw technology. Then a quasi-static loading test was carried out using a cantilever beam loading scheme to investigate the influence of both freeze-thaw cycles and axial compression ratio on the seismic behavior of RC shear wall，that include bearing capability，deformation capacity，strength degradation，initial stiffness，stiffness degradation，and energy-dissipating capacity．The results reveal that the RC shear wall specimens subjected to freeze-thaw cycles suffered more serious damage than the intact specimen with the same axial compression ratio．Their initial stiffness，horizontal bearing capacity，deformation capacity，and energy dissipation capacity all showed different degrees of degradation．In addition，the strength attenuation amplitude，rate of stiffness degradation，shear deformation under different stress states，and ratio of shear deformation to total deformation under different loading conditions increased to varying degrees．When the number of freeze-thaw cycles is the same，with the increase in axial compression ratio，the crack distribution range，horizontal bearing capacity，initial stiffness，strength attenuation amplitude，and rate of stiffness degradation of RC shear wall specimens gradually increased，while the deformation capacity，energy dissipation capacity，and the shear deformation under different stress states decreased．The ratio of shear deformation to total deformation gradually decreased in the yield state，but it gradually increased and became the main deformation in the peak state．Considering the influence of freeze-thaw damage parameter D and axial compression ratio n on the peak load and ultimate displacement of RC shear wall，the calculation formula of RC shear wall peak load and ultimate dislacement correction factor that accounts for the influence of freeze-thaw damage was established by using multi-parameter fitting．This research can provide a reference for performance evaluation of in-service highrise building structures using shear walls as the main lateral load resisting system in severely cold areas．\r
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Keyword_Chinese:RC剪力墙；轴压比；冻融循环；拟静力加载；抗震性能\r

Keywords_English:RC shear wall；axial compression ratio；freeze-thaw cycle；pseudo-static loading；seismic performance\r


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