基于锈胀裂缝宽度的钢筋锈蚀深度计算模型
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摘要
钢筋锈蚀深度反映了钢筋的锈蚀程度,其数值对混凝土结构的耐久性评估具有重要意义。混凝土锈胀裂缝宽度容易检测,且与钢筋锈蚀深度具有一定的关系。首先对现有钢筋混凝土结构锈胀裂缝宽度与钢筋锈蚀深度之间的模型进行了总结,并将各关系式中的常数系数用待定系数替代,结合检测数据进行多元非线性拟合,根据所得可决系数比较分析了各模型的准确性、合理性及产生差异的原因。在此基础上以可决系数最高的模型为参考,结合临界钢筋锈蚀深度研究成果,提出与锈胀裂缝宽度有关的钢筋锈蚀深度计算模型,所得模型与实际检测数据吻合较好。相关成果可为钢筋混凝土结构中钢筋锈蚀程度预测、耐久性评估和维护提供参考。
The degree of corrosion is a significant value in the structural durability assessment process and could be reflected by depth of steel corrosion.The concrete crack width has some relationship with the corrosion depth and could be tested more easily.The existing relationship models between crack width and steel corrosion depth were summarized and the constant coefficients of the models were replaced by undetermined coefficients for new ones.By making nonlinear multiple regression on the detected data and according to the concordant coefficient,the accuracy,rationality of each model and the reason why they appear differently were analyzed.On the basis of the model which fits the data best and the chosen critical corrosion depth model from other papers,a new relation model between crack width and steel corrosion depth was created and it coincide well with the collected data.This model could provide reference for forecasting the corrosion degree of the rebar in the reinforced concrete structure,assessing the durability of the structure and structural maintenance.
The degree of corrosion is a significant value in the structural durability assessment process and could be reflected by depth of steel corrosion.The concrete crack width has some relationship with the corrosion depth and could be tested more easily.The existing relationship models between crack width and steel corrosion depth were summarized and the constant coefficients of the models were replaced by undetermined coefficients for new ones.By making nonlinear multiple regression on the detected data and according to the concordant coefficient,the accuracy,rationality of each model and the reason why they appear differently were analyzed.On the basis of the model which fits the data best and the chosen critical corrosion depth model from other papers,a new relation model between crack width and steel corrosion depth was created and it coincide well with the collected data.This model could provide reference for forecasting the corrosion degree of the rebar in the reinforced concrete structure,assessing the durability of the structure and structural maintenance.
引文
[1]金伟良,赵羽习.混凝土结构耐久性[M].北京:科学出版社,2002.
[2]赵羽习,金伟良.钢筋锈蚀导致混凝土构件保护层胀裂的全过程分析[J].水利学报,2005,36(5):939-945.
[3]孙彬,牛荻涛,王庆霖.锈蚀钢筋混凝土梁抗弯承载力计算方法[J].土木工程学报,2008,41(11):1-6.
[4]袁迎曙,贾福萍,蔡跃.锈蚀钢筋混凝土梁的结构性能退化模型[J].土木工程学报,2001,34(3):47-52.
[5]牛荻涛,王庆霖,王林科.锈蚀开裂后混凝土中钢筋锈蚀量的预测[J].工业建筑,1999,29(2):51-55.
[6]罗晓辉,卫军,徐港.钢筋锈胀时混凝土保护层损伤模型[J].华中科技大学学报:自然科学版,2008,36(6):115-118.
[7]RODRIGUEZ J,ORTEGA L M,CASAL J,et al.Corrosion of reinforcement and service life of concrete structures[J].Proceedings of7th International Conference on Durability of Building Materials and Components.London,1996:17-126.
[8]VIDAL T,CASTEL A,FRANEOIS R.Analyzing crack width to predict corrosion in reinforced concrete[J].Cement and Concrete Research,2004,34:165-174.
[9]ZHANG R,CASTEL A,FRANCOIS R.Concrete cover cracking with reinforcement corrosion of RC beam during chloride-indueed corrosion process[J].Cement and Concrete Researeh,2010,40:415-425.
[10]王深.钢筋混凝土结构锈胀裂缝的研究及耐久性评估[D].上海:同济大学,2000.
[11]惠云玲.混凝土结构中钢筋锈蚀评估的试验研究报告[R].北京:冶金部建筑研究总院,1985.
[12]ANDRADE C,ALONSO C,MOLINA F J.Cover cracking as a function of bar corrosion:part1-experimentaltest[J].Materials and Structures,1993,26:453-464.
[13]CECS 220:2007,混凝土结构耐久性评定标准[S].
[14]袁立群.混凝土结构锈胀裂缝分析与钢筋锈蚀预测研究[D].西安:西安建筑科技大学,2007.
[15]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.
[16]陈海斌,牛荻涛,浦聿修.应用人工神经网络技术评估混凝土中的钢筋锈蚀量[J].工业建筑,1999,29(2):51-55.
[17]ALONSO C,ANDRADE C,RODRIGUEZ J,et al.Factors controlling cracking of concrete affected reinforcement corrosion[J].Materials and Structures,1998,31(211):435-441.
[18]WBSTER M P,CLARK L A.The structural effect of corrosion-an overview of the mechanism[C]//Proceedings of concrete communication.Birmingham.UK,2000:409-421.
[19]张伟平.混凝土结构的钢筋锈蚀损伤预测及其耐久性评估[D].上海:同济大学,1999.
[2]赵羽习,金伟良.钢筋锈蚀导致混凝土构件保护层胀裂的全过程分析[J].水利学报,2005,36(5):939-945.
[3]孙彬,牛荻涛,王庆霖.锈蚀钢筋混凝土梁抗弯承载力计算方法[J].土木工程学报,2008,41(11):1-6.
[4]袁迎曙,贾福萍,蔡跃.锈蚀钢筋混凝土梁的结构性能退化模型[J].土木工程学报,2001,34(3):47-52.
[5]牛荻涛,王庆霖,王林科.锈蚀开裂后混凝土中钢筋锈蚀量的预测[J].工业建筑,1999,29(2):51-55.
[6]罗晓辉,卫军,徐港.钢筋锈胀时混凝土保护层损伤模型[J].华中科技大学学报:自然科学版,2008,36(6):115-118.
[7]RODRIGUEZ J,ORTEGA L M,CASAL J,et al.Corrosion of reinforcement and service life of concrete structures[J].Proceedings of7th International Conference on Durability of Building Materials and Components.London,1996:17-126.
[8]VIDAL T,CASTEL A,FRANEOIS R.Analyzing crack width to predict corrosion in reinforced concrete[J].Cement and Concrete Research,2004,34:165-174.
[9]ZHANG R,CASTEL A,FRANCOIS R.Concrete cover cracking with reinforcement corrosion of RC beam during chloride-indueed corrosion process[J].Cement and Concrete Researeh,2010,40:415-425.
[10]王深.钢筋混凝土结构锈胀裂缝的研究及耐久性评估[D].上海:同济大学,2000.
[11]惠云玲.混凝土结构中钢筋锈蚀评估的试验研究报告[R].北京:冶金部建筑研究总院,1985.
[12]ANDRADE C,ALONSO C,MOLINA F J.Cover cracking as a function of bar corrosion:part1-experimentaltest[J].Materials and Structures,1993,26:453-464.
[13]CECS 220:2007,混凝土结构耐久性评定标准[S].
[14]袁立群.混凝土结构锈胀裂缝分析与钢筋锈蚀预测研究[D].西安:西安建筑科技大学,2007.
[15]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.
[16]陈海斌,牛荻涛,浦聿修.应用人工神经网络技术评估混凝土中的钢筋锈蚀量[J].工业建筑,1999,29(2):51-55.
[17]ALONSO C,ANDRADE C,RODRIGUEZ J,et al.Factors controlling cracking of concrete affected reinforcement corrosion[J].Materials and Structures,1998,31(211):435-441.
[18]WBSTER M P,CLARK L A.The structural effect of corrosion-an overview of the mechanism[C]//Proceedings of concrete communication.Birmingham.UK,2000:409-421.
[19]张伟平.混凝土结构的钢筋锈蚀损伤预测及其耐久性评估[D].上海:同济大学,1999.
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