3·11大地震海啸浸泡后的带裂纹RC钢筋强度鉴定
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
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 solve the problem of seismic evaluation of reinforced concrete( RC) structures which soaked in the tsunami caused by the Great East Japan Earthquake,based on survey of related studies done by foreign scholars,the authors investigated damaged structures in the earthquake. The result is that once crack happens on the surface of concrete,seawater will come into the concrete and lead to corrosion of rebar. Deterioration of rebar's performance after the corrosion was studied through tensile test. The result shows that after the corrosion,yielding point of rebar remains unchanged basically,maximum stress reduces by roughly 10%,and ductility also decreases. Based on this study,a manual for seismic evaluation and repair aimed at seawater immersed RC structure was proposed.
引文
[1]Jang S Y,Kim B S,Oh B H.Effect of crack width on chloride diffusion coefficients of concrete by steadystate migration tests[J].Cement and Concrete Research,2011,41:9-19.
    [2]岩波光保,横田弘,佐藤文則.鉄筋腐食がRCはりの耐荷性能に及ぼす影響[C].コンクリート工学年次論文集,東京,2002,24(2):1501-1506.Iwanami M,Yokota H,Sato F.Influence of corrosion of steel bars on bearing capacity of RC beams[C].Proceedings of Concrete Engineering Institute.Conference of Concrete Engineering Institute of Japan,Tokyo,2002,24(2):1501-1506.(in Japanese)
    [3]渡辺博志,木村嘉富,古賀裕久,等.コンクリートひび割れ部の塩分浸透性と鋼材腐食に関する暴露試験[R].東京:土木研究所,2009(4130).Watanabe H,Kimura Y,Koga H,et al.Weathering test about relationship between salinity permeability at crack part of concrete and steel corrosion[R].Tokyo:Public Works Research Institute,2009(4130).(in Japanese)
    [4]Gowripalana N,Sirivivatnanon V,Lima C C.Chloride diffusivity of concrete cracked in flexure[J].Cement and Concrete Research,2000,30:725-730.
    [5]加藤絵万,濱田洋志,岩波光保,等.局所的に生じた鉄筋腐食がRC梁の構造性能に及ぼす影響[R].東京:港湾空港技術研究所,2008,047-01-02.Kato E,Hamada H,Iwanami M,et al.Influence of localized corrosion of steel bars on structural performance of RC beams[R].Tokyo:Port and Airport Research Institute,2008,047-01-02.(in Japanese)
    [6]大即信明,浜田秀則,原茂雅光.鉄筋およびプレストレストコンクリートパイルの耐海水性(材令10年結果報告)[R].東京:港湾空港技術研究所,1988,No.0605.Otsuki N,Hamada H,Haramo M.Durability of RC and PC concrete piles in marine environment[R].Tokyo:Port and Airport Research Institute,1988,No.0605.(in Japanese)
    [7]Vidal T,Castel A,Franois R.Corrosion process and structural performance of a 17 year old reinforced concrete beam stored in chloride environment[J].Cement and Concrete Research,2007,37:1551-1561.
    [8]Castel A,Franois R,Arliguie G.Mechanical behavior model of corroded reinforced concrete[J].Comptes Rendus de l’Académie des Sciences-Série IIb/Mechanics,2002,(330):45-50.
    [9]日本建築防災協会.既存鉄筋コンクリート造建物の耐震診断基準(2001年改訂版)[S].東京:日本建築防災協会,2001:157-163.Guideline of seismic evaluation and retrofit of existing RC structures,2001 revised edition[S].Japan:The Japan Building Disaster Prevention Association,2001:157-163.(in Japanese)

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心