近海大气环境下低矮RC剪力墙抗震性能试验

郑山锁,秦卿,杨威,甘传磊,张艺欣,丁莎

(西安建筑科技大学 土木工程学院,710055 西安)



摘要:

为了解近海大气环境下低矮RC剪力墙的抗震性能,采用人工气候实验室对6片剪跨比1.0的低矮RC剪力墙试件进行模拟近海大气环境腐蚀试验,进而对其进行拟静力试验,得到不同轴压比和不同锈胀裂缝宽度下腐蚀试件的滞回曲线,绘制出各个试件的骨架曲线,分析轴压比和锈胀裂缝宽度对腐蚀试件强度、刚度、延性、耗能能力等抗震性能指标的影响.结果表明:随轴压比增加,腐蚀试件的承载力和刚度不断提高,而延性和变形恢复能力却降低,表明在近海大气环境下对低矮RC剪力墙进行抗震设计时需要严格控制其轴压比；随锈胀裂缝宽度的增加,试件的开裂荷载和峰值荷载不断降低,刚度、延性和耗能能力均变差,当遭受腐蚀较为严重时,脆性破坏更为显著,说明在近海大气环境下低矮RC剪力墙内部钢筋锈蚀越来越严重,抗震性能越来越差.

关键词:  近海大气环境  低矮RC剪力墙  锈胀裂缝宽度  拟静力试验  抗震性能

DOI：10.11918/j.issn.0367-6234.2015.12.011

分类号:TU375

基金项目:国家科技支撑计划(2013BAJ08B03)；教育部高等学校博士学科点专项科研基金(20136120110003).



Experimental research on theseismic behaviors of squat RC shear walls under offshore atmospheric environment

ZHENG Shansuo, QIN Qing, YANG Wei, GAN Chuanlei, ZHANG Yixin, DING Sha

(School of Civil Engineering, Xi’an University of Architecture and Technology, 710055 Xi’an, China)

Abstract:

The accelerated corrosion tests of six squat shear walls with span ratio of 1.0 were conducted by artificial climate laboratory to understand the seismic performance of squat RC shear walls under offshore atmospheric environment. Their quasi-static experiments were implemented. The hysteresis loops regarding the relation between horizontal load and displacement of specimens with different axial compression ratio and various degrees of corrosion crack width were obtained. The skeleton curves of specimens were further achieved. Based on the test results, some performance aspects, such as the ultimate capacity, rigidity, ductility and energy dissipation capacity, were analyzed. The result shows that with the increase of axial compression ratio the bearing capacity and stiffness of corrosion specimens continued to improve, while their ductility and the deformation recovery capability are reduced. These manifest that the axial compression ratio must be strictly controlled during seismic design under offshore atmospheric environment. In addition, the crack load and the ultimate load, rigidity, ductility, energy dissipation capacity decrease with the increase of corrosion crack width of specimens. Moreover, when the specimen subjected to serious corrosion, the brittle failure is more obvious without any warning. Above findings demonstrate that with concrete ages growing over time, the internal rebar under this condition suffers increasingly severe corrosion and behaves worse in seismic performance.

Key words:  offshore atmospheric environment  squat RC shear wall  corrosive crack width  quasi-static tests  seismic behavior