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为解决在东日本大地震造成的海啸中受到海水浸泡的钢筋混凝土(RC)结构的抗震鉴定问题,在调查国外相关研究的基础上,实地考察了东日本大地震中的受损建筑物。结果表明,只要混凝土表面存在裂缝,海水均将浸入到混凝土内部引起钢筋的腐蚀。通过拉伸试验研究了腐蚀后钢筋的性能变化,结果表明,腐蚀后钢筋的屈服点基本没有变化,最大应力下降了10%左右,变形能力也有所降低。在此基础上建议了海水浸泡后钢筋混凝土结构的抗震鉴定及修复流程。
To address the seismic identification of reinforced concrete (RC) structures exposed to seawater during the tsunami caused by the Great East Japan Earthquake, we surveyed damaged structures in the Great East Japan Earthquake on the basis of surveys of foreign studies. The results show that as long as there is a crack in the concrete surface, the sea water will be immersed into the concrete to cause the corrosion of steel bars. The results of tensile test show that the yield point of the steel after corrosion is basically unchanged, the maximum stress is reduced by about 10%, and the deformation capacity is also reduced. On this basis, the seismic identification and repair process of reinforced concrete structures after seawater immersion are suggested.