基于碳化的既有钢筋混凝土桥梁耐久性的概率分析
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摘要
分析讨论了混凝土碳化机理及其影响因素,并探讨了混凝土碳化深度的预测数学模型,基于既有钢筋混凝土桥梁的实测数据,对碳化系数和混凝土强度进行回归分析,建立了根据混凝土强度预测碳化深度的数学模型。将混凝土强度,保护层厚度,计算模式不确定性系数作为随机变量,以混凝土的碳化深度作为一个随时间变化的随机过程,建立了混凝土碳化到钢筋表面的时变概率随机模型,并以一座实际桥梁为例,给出了在不同使用年限时混凝土碳化到钢筋表面的预测值。结果表明,该模型可用于大气环境下基于碳化的钢筋混凝土桥梁结构耐久性评估。
The mechanism of concrete carbonation and influencing factor,as well as the predicated model of carbonation depth of reinforced concrete structures are discussed and analyzed.According to the inspection results of existing reinforced concrete bridges,the mathematical model of carbonation depth based on concrete strength is established by regression analysis of concrete carbonation coefficient and strength.A time-varying probabilistic stochastic model of concrete carbonation developing to the surface of the reinforcement is established by considering concrete strength,the thickness of concrete cover and the uncertainty coefficient of computation mode as random variables,and taking the carbonation depth of concrete structures as a stochastic process with time.It shows that the stochastic model can be used to durability assess of existing reinforced concrete structures in atmosphere environment.
The mechanism of concrete carbonation and influencing factor,as well as the predicated model of carbonation depth of reinforced concrete structures are discussed and analyzed.According to the inspection results of existing reinforced concrete bridges,the mathematical model of carbonation depth based on concrete strength is established by regression analysis of concrete carbonation coefficient and strength.A time-varying probabilistic stochastic model of concrete carbonation developing to the surface of the reinforcement is established by considering concrete strength,the thickness of concrete cover and the uncertainty coefficient of computation mode as random variables,and taking the carbonation depth of concrete structures as a stochastic process with time.It shows that the stochastic model can be used to durability assess of existing reinforced concrete structures in atmosphere environment.
引文
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[15]颜承越.水灰比—碳化方程与抗压强度—碳化方程的比较[J].混凝土,1994(3):46-49.
[2]Frangopol D M,Lin Kai-yun,Estes A C.Reliability of reinforced con-crete girders under corrosion at tack[J].Journal of Structural Engi-neering,1997,123(3):286-297.
[3]牛荻涛,陈亦奇,于澍.混凝土结构的碳化模式与碳化寿命分析[J].西安建筑科技大学学报,1995,27(4):365-369.
[4]屈文俊,车惠民.既有混凝土桥梁的碳化分析及耐久性预测[J].铁道学报,1996,18(3):80-84.
[5]吴丽,卜贵贤.混凝土碳化的影响因素及碳化深度预测模型[J].防渗技术,2002,8(3):10-12.
[6]徐善华,牛荻涛,王庆霖.钢筋混凝土结构碳化耐久性分析[J].建筑技术开发,2002,29(8):8-10.
[7]程云虹,刘斌.混凝土结构耐久性研究现状及趋势[J].东北大学学报,2003,24(6):600-605.
[8]洪乃丰.混凝土中钢筋腐蚀与防护技术(1)———钢筋腐蚀危害与对混凝土的破坏作用[J].工业建筑,1999,29(8):66-68.
[9]蒋清野,王洪深,路新瀛.混凝土碳化数据库与混凝土碳化分析[R].攀登计划—钢筋锈蚀与混凝土冻融破坏的预测模型,1997年度研究报告,1997,12.
[10]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.
[11]蔡光汀.钢筋混凝土腐蚀机理和防腐措施探讨[J].1992,4(1):18-24.
[12]朱安民.混凝土碳化与钢筋混凝土耐久性[J].混凝土.1992(6):18-22.
[13]黄可信,吴兴祖,等编译.钢筋混凝土结构中钢筋腐蚀与保护[M].北京:中国建筑工业出版社,1983.
[14]张誉,蒋利学.基于碳化机理的混凝土碳化深度实用数学模型[J].工业建筑,1998,28(1):16-19.
[15]颜承越.水灰比—碳化方程与抗压强度—碳化方程的比较[J].混凝土,1994(3):46-49.
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