海工混凝土结构耐久性寿命预测评估研究

发布时间：2018-01-03 10:26

本文关键词：海工混凝土结构耐久性寿命预测评估研究　出处：《烟台大学》2014年硕士论文　论文类型：学位论文

【摘要】：海工混凝土结构的耐久性寿命研究具有重大意义。本文简要介绍了海工混凝土结构的耐久性设计方法；介绍了氯离子在海工混凝土中的传输机理及氯离子传输模型的研究进展，针对常用的Fick第二定律方程，分析了耐久性参数取值存在的问题并对参数进行可靠性灵敏度分析。对可靠性灵敏度分析问题，采用拉丁超立方抽样（LHS）模拟求解，并提出二维及二维以上海工混凝土结构构件灵敏度分析的有限体积-蒙特卡洛（FVM-MC）方法。由灵敏度分析的结果，提出采用时间序列回归预测模型理论，分析海工混凝土结构中氯离子分布规律。该方法根据现场实测数据分析氯离子浓度的变化规律，无需对氯离子的传输方式进行简化，综合考虑影响氯离子传输的多种因素，大大简化了耐久性参数的取值问题，减少了参数取值带来的误差，是海工混凝土结构耐久性寿命预测的新方法。本文主要内容包括：（1）对Fick第二定律解析解模型中的耐久性参数进行可靠性灵敏度分析，比较各耐久性参数取值对失效概率的影响程度；首次提出采用FVM-MC方法，分析二维及多维情况下海工混凝土结构构件的可靠性灵敏度问题。（2）首次提出采用时间序列回归预测模型理论预测混凝土中的氯离子分布。（3）为了证明时间序列回归预测模型理论预测氯离子分布的有效性，，设计验证试验。试验包括非稳态快速氯离子迁移系数试验、电加速渗透试验、定电压加速渗透试验。对试验得到的氯离子浓度关于时间和空间的数据，采用时间序列回归预测模型进行回归分析，验证所提方法的有效性。
[Abstract]:It is of great significance to study the durability life of marine concrete structures. This paper introduces the mechanism of chloride transport in marine concrete and the research progress of chloride ion transport model, aiming at the second law equation of Fick. The problems existing in the selection of durability parameters are analyzed and the reliability sensitivity of the parameters is analyzed. The Latin hypercube sampling LHS is used to solve the reliability sensitivity analysis problem. A finite volume-Monte Carlo method for sensitivity analysis of Shanghai concrete structures is presented in this paper. The results of sensitivity analysis are obtained from the results of the sensitivity analysis. A time series regression prediction model theory is proposed to analyze the distribution of chloride ions in marine concrete structures, and the variation law of chloride ion concentration is analyzed based on the field measured data. There is no need to simplify the mode of chloride ion transport. Considering the various factors affecting chloride ion transport, the problem of choosing durability parameters is greatly simplified, and the error caused by parameter selection is reduced. It is a new method to predict the durability life of marine concrete structures. The main contents of this paper are as follows: 1) the reliability sensitivity of the durability parameters in the analytical solution model of the second law of Fick is analyzed, and the influence of the durability parameters on the failure probability is compared. For the first time, FVM-MC method is used to analyze the reliability sensitivity of marine concrete structural members under two-dimensional and multi-dimensional conditions. 2) it is the first time to use time series regression prediction model theory to predict chloride ion distribution in concrete. 3) in order to prove the validity of time series regression prediction model theory in predicting chloride ion distribution, a validation test was designed. The experiments include the unsteady fast chloride ion transport coefficient test and the electric accelerated permeation test. The time series regression model was used to analyze the time and space data of chloride ion concentration in constant voltage accelerated permeation test to verify the validity of the proposed method.
【学位授予单位】：烟台大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU375

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