海水干湿循环对带裂缝钢筋混凝土柱力学性能及氯离子含量的影响

发布时间：2018-11-26 09:47

【摘要】：通过实验室模拟沿海氯环境和钢筋混凝土结构服役工作条件。使初始裂缝宽度分别为0、0.07、0.10、0.14 mm的钢筋混凝土(RC)偏压柱试件受到100次海水干湿循环作用,观察裂缝发展情况,然后对柱试件进行静力偏压加载试验,并测量受拉区混凝土的氯离子含量。结果表明,不同初始裂缝宽度的RC柱试件经过100次海水干湿循环后,其屈服荷载、极限荷载和延性均随初始裂缝宽度的增加而降低;按规范计算的偏压承载力均高于试验值。与偏压极限荷载试验值相比,当初始裂缝宽度小于0.10 mm时,规范计算极限荷载值的相对误差小于5%,裂缝宽度为0.10 mm及以上时,规范计算极限荷载值的相对误差大于16%。柱试件混凝土受拉表层(0~10 mm)的氯离子含量随初始裂缝宽度的增加而增大;当裂缝宽度小于0.10 mm时,受拉混凝土内层(10~30 mm)的氯离子含量差别不大;裂缝宽度为0.10 mm及以上时,受拉混凝土内层(10~30 mm)的氯离子含量近乎成倍增加。
[Abstract]:The working conditions of coastal chlorine environment and reinforced concrete structure were simulated in laboratory. The specimens of reinforced concrete (RC) eccentric columns with initial crack width of 0 ~ 0.07 ~ 0.10 ~ 0.14 mm were subjected to seawater dry and wet cycles for 100 times. The crack development was observed, and then the static biasing loading test was carried out on the column specimens. The chloride ion content of concrete in tension zone was measured. The results show that the yield load, ultimate load and ductility of RC column specimens with different initial crack widths decrease with the increase of initial crack width after 100 cycles of seawater dry and wet cycles, and the eccentric bearing capacity calculated according to the specifications is higher than the experimental value. When the initial crack width is less than 0.10 mm, the relative error of calculating the ultimate load value is less than 5, and the crack width is 0.10 mm and above. The relative error of calculating limit load value is greater than 16. The chloride content of the tensile surface (0 ~ 10 mm) increases with the increase of the initial crack width, and when the crack width is less than 0.10 mm, the chloride content in the inner layer of the tensile concrete (10 ~ 30 mm) has little difference. When the crack width is 0.10 mm or more, the chloride content in the inner layer of tensile concrete (1030 mm) increases almost exponentially.
【作者单位】：北京航空航天大学土木工程系;华南理工大学亚热带建筑科学国家重点实验室;
【基金】：国家自然科学基金项目(51178020) 亚热带建筑科学国家重点实验室开放课题(2012KA03)
【分类号】：TU375.3

【参考文献】