单位时间内通过混凝土结构的总电荷量是反映混凝土结构氯离子渗透能力的一个重要指标.针对传统经验公式法预测了氯离子总电荷量的不足,建立了一个模糊-神经网络模型以预测氯离子总电荷量.此模型能同时考虑多种因素及其非线性耦合作用,方便易行、通用性好,较之其它神经网络具有运算速度快、不容易陷入局部最优、训练效果好的特点.训练样本训练后的结果表明,该模型具有较高的准确度,能可靠预测氯离子总电荷量,准确评价混凝土结构的抗氯盐侵蚀能力,为实际工程的耐久性设计和评价提供依据.
Chloride permeability of concretes,which is determined through rapid chloride permeability test (RCPT),is an important indicator of the ability of chloride ion penetration in concrete.Because it is inaccurate to be predicated by the traditional empirical formula,a new model,based on neural network and fuzzy theory,has been proposed to estimate chloride permeability of concrete.Many related factors and the non-linear coupling effects of them have been taken into account.This model is simple for use and can be effective on many occasions.Compared with other neural networks,the method is better not only because of its high-speed in calculation but also its refusal of local optimum.After training,the testing results show that it has high accuracy.In short,the model is able to predict chloride permeability of concrete reliably and provide assistance for the estimation of durability in practical project designs.
参考文献
| [1] | 柯伟.中国腐蚀调查报告[M].北京:化学工业出版社,2003 |
| [2] | 洪定海.混凝土中钢筋的腐蚀与保护[M].北京:中国铁道出版社,1998 |
| [3] | 金伟良;赵羽习.混凝土结构耐久性[M].北京:科学出版社,2003 |
| [4] | Eric J .Numerical simulation of reinforced concrete deterioration:Chloride diffusion[J].ACI Materials Journal,1999,96(06):173. |
| [5] | Sascha Lay et al.Lifecon deliverables[R].Technical Research Centre of Finland,2003. |
| [6] | 闻新;周露.Matlab神经网络仿真与应用[M].北京:科学出版社,2003 |
| [7] | 伍世虔;徐军.动态模糊神经网络[M].北京:清华大学出版社,2007 |
| [8] | 杨则英,黄承逵,曲建波.基于自适应神经-模糊推理系统和遗传算法的桥梁耐久性评估[J].土木工程学报,2006(02):16-20. |
| [9] | 刘斯凤,邢锋.多因素作用下混凝土寿命的BP神经网络预测[J].材料导报,2008(07):85-87. |
| [10] | Erhan Gueneyisi;Mehmet Gesoglu;Turan Oezturan;Erdogan Oezbay .Estimation Of Chloride Permeability Of Concretes By Empirical Modeling: Considering Effects Of Cement Type, Curing Condition And Age[J].Construction and Building Materials,2009(1):469-481. |
| [11] | AASHTO T 277 rapid determination of the chloride permeability of concrete[S].Washington:AASHTO,1990. |
| [12] | ASTM imternational ASTM C1202 standard test method for electrical indication of concrete's ability to resist chloride ion penetration[S].Washington:ASTM,1997. |
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