【作者】 郑宏宇；

【导师】 郑建军； 丁建江；

【作者基本信息】 浙江工业大学 ， 土木工程， 2010， 硕士

【摘要】 钢筋混凝土结构广泛应用于工业与民用建筑，根据钢筋混凝土结构本身的特点，它们具有一定的使用寿命。如何提高混凝土结构的使用寿命和耐久性，特别在沿海氯离子含量较高的环境下尤为重要。混凝土表面开裂时间、最大钢筋锈胀力、表面裂缝宽度是影响混凝土结构耐久性的主要因素。研究这三个主要因素对钢筋混凝土结构耐久性评估和设计非常关键，三者均可作为沿海钢筋混凝土结构使用寿命的测度。因此，本文的研究不仅具有一定的理论意义，而且具有重要的应用价值。本文基于混凝土保护层开裂的同心圆柱体模型，讨论了混凝土保护层开裂解析解，获得了混凝土保护开裂时间和最大钢筋锈胀力。该解分析解与文献中的试验结果进行了比较，证实了该模型的有效性。提出了多因素耦合作用下混凝土保护层开裂时间和最大钢筋锈胀力评估的概率方法。考虑结构特征参数的变异性，通过计算机数值模拟，定量分析了各参数对开裂时间和最大钢筋锈胀力的影响，并通过数值分析，进一步确定了各影响因素的相对重要性。基于数值结果，本文得到了一些有用的结论，为沿海钢筋混凝土结构耐久性设计和评估提供理论依据。更多还原

【Abstract】 Reinforced concrete structures are widely used in industrial and civil buildings.According to the characteristics of the reinforced concrete structure, it has a limitedservice life. It is very important how to increase the service life and durability ofconcrete structures especially in the coastal area of high chloride contents. The time tosurface cracking, the maximum steel expansive force, and the surface crack width arethe main factors that affect the durability of concrete structures. It is very critical tostudy the three main factors for the durability assessment and design of reinforcedconcrete structures. The three factors can be used as the measure for the service life ofreinforced concrete structures. Therefore, this study conducted in this thesis is not onlyof theoretical significance but also of important practical value.Based on the cocentric cylinder model for concrete cover cracking, the solution forthe concrete cracking is discussed in this thesis. The time to surface cracking and themaximum steel expansive force are obtained. By comparing the analytical solution withthe experimental results collected from the literature, the validity of the proposed modelis verified. A probability method is developed for the assessment of the time to surfacecracking and the maximum steel expansive force of concrete cover under the couplingeffect of multiple factors. Considering the variability of structure characteristicalparameters, the effects of the various parameters on the time to surface cracking and themaximum steel expansive force is quantitatively evaluated by computer numericalsimulation. By numerical analysis, the relative importance of various factors isidentified. Based on the numerical results, some useful conclusions are drawn, whichprovides a theoretical foundation for the durability design and assessment of reinforcedconcrete structures.更多还原