钢筋混凝土结构寿命预测与评估方法研究
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摘要
在非侵蚀性环境下,在不考虑结构损伤的情况下,混凝土结构的寿命主要取决于碳化速率v和钢筋保护层厚度d。通过对碳化速率和钢筋保护层施工偏差实测数据的统计分析,采用皮尔逊χ2准则,证明了二者可以近似地看作服从N(d,Sd*2)、N(v,Sv*2)分布。假设混凝土碳化深度大于钢筋保护层厚度的概率超过5%对应的时间为结构寿命,结合正态分布的相关性质,建立了钢筋混凝土结构寿命预测与评估概率模型和计算方法。
Under the non-corrosive environment,if structure damnification isn’t considered,life of reinforced concrete is influenced by carbonize velocity(v) and thickness of concrete cover(d).Based on the statistical analysis of field test datum,according to Pearson criterion,carbonize velocities and thickness deviations of concrete cover can be regard as normal distribution.Assumed,when the probability of vt-d<0 exceeds 5%,t is the structure life.Combined with the relevant properties of normal distribution,probability model and calculation method are proposed to evaluate or to forecast life of reinforced concrete structure.
Under the non-corrosive environment,if structure damnification isn’t considered,life of reinforced concrete is influenced by carbonize velocity(v) and thickness of concrete cover(d).Based on the statistical analysis of field test datum,according to Pearson criterion,carbonize velocities and thickness deviations of concrete cover can be regard as normal distribution.Assumed,when the probability of vt-d<0 exceeds 5%,t is the structure life.Combined with the relevant properties of normal distribution,probability model and calculation method are proposed to evaluate or to forecast life of reinforced concrete structure.
引文
[1]高瑾,郭超江,等.水工混凝土的碳化与耐久性[J].混凝土,1994(2).
[2]邸小坛,周燕.旧建筑物的检测加固与维护[M].北京:地震出版社,1992.
[3]沈恒范.概率论与数理统计[M].北京:高等教育出版社,1995.
[4]胡玉初,鹿立云,等.上海吴淞导堤混凝土方块破坏情况调查质量评估及修补方案[Z].南京水利科学研究院材料结构研究所,1991(4).备注:资料来源于上海市水利工程设计研究院.
[5]杨林德,耿大新,等.本市重要部位防汛墙段抗震能力的评估研究报告[Z].上海市建委基金项目(编号:A0106154),2003,11.
[2]邸小坛,周燕.旧建筑物的检测加固与维护[M].北京:地震出版社,1992.
[3]沈恒范.概率论与数理统计[M].北京:高等教育出版社,1995.
[4]胡玉初,鹿立云,等.上海吴淞导堤混凝土方块破坏情况调查质量评估及修补方案[Z].南京水利科学研究院材料结构研究所,1991(4).备注:资料来源于上海市水利工程设计研究院.
[5]杨林德,耿大新,等.本市重要部位防汛墙段抗震能力的评估研究报告[Z].上海市建委基金项目(编号:A0106154),2003,11.
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