RANDAM-FIELD-BASED EMPIRICAL DURABILITY ANALYSIS OF REINFORCED CONCRETE STRUCTURES IN MARINE ENVIRONMENT
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摘要: 该文基于随机场理论及模拟方法，考虑耐久性参数批次效应，选取位于香港的海洋环境在役混凝土结构工程，进行其表观劣化发展过程的模拟分析与评价，并与实际检测数据进行对比，以验证耐久性分析结果准确性。结果表明：模拟分析结果与实际损坏程度基本一致。该文指出，基于随机场的模拟分析方法能够给出海洋混凝土结构多个维度的表观劣化度信息，将可能指导未来其它工程设计方案和维护策略的制定，从而有助于结构预想的全寿命性能实现和成本控制。Abstract: Based on random field theory and the simulation method considering the Batch Production Effect, this study conducts simulations and assessments for the surface deterioration process of an in-service reinforced concrete (RC) structure in marine environment in Hong Kong. To verify the accuracy of the analysis results, they are compared with the in-situ inspection data. It is concluded that the simulation results are consistent with the realistic damage extents. Further, this study suggests that the random-field-based simulation method can provide the information on surface deterioration of marine RC structures with more measures, and in the future will guide the formulation of design schemes and maintenance strategies for other projects, and therefore help the implement of the target life-cycle performances and cost controls.
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Key words:
- RC structures /
- concrete durability /
- random field /
- chloride-attack /
- surface deterioration /
- empirical study
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图 3 不同龄期混凝土面板劣化到A、B、C、D四个等级的百分比变化情况
Figure 3. Percentages that reinforced concrete slabs deteriorate to Grade A, B, C and D at different service ages
图 5 开裂比例、最大裂缝宽度、最大裂缝长度、裂缝数量均值和分布情况随服役时间的变化
Figure 5. Means and probability distributions of cracking proportions, maximum crack widths, maximum crack lengths and cracking amounts at different ages
表 1 码头混凝土面板耐久性参数的统计特征
Table 1. Statistic properties of durability parameters of the reinforced concrete slabs
参数变量 分布模型 统计特征 相关
长度/mm临界氯离子浓度Ccr/
混凝土质量百分比/(%)对数正态分布 均值：0.10，
标准差：0.022000 表面氯离子浓度Cs/
混凝土质量百分比/(%)对数正态分布 均值：0.27，
标准差：0.041960 不同批次间的保护层
厚度分项c(b)/mm对数正态分布 均值：43.0，
标准差：9.2− 同一批次内的保护层
厚度分项c(a)/mm正态分布 均值：0，
标准差：3.7130 不同批次间的扩散系数分项$D_{{\rm{a}}0}^{({\rm{b}})} $/(×10−12 m2/s) 对数正态分布 均值：4.35，
标准差：1.44− 同一批次内的扩散系数分项$D_{{\rm{a}}0}^{({\rm{a}})} $/(×10−12 m2/s) 正态分布 均值：0，
标准差：0.50250 指数衰减系数n 正态分布 均值：0.2，
标准差：0.01− 不均匀锈蚀程度参数κ 均匀分布 下界：4，
上界：8− 锈蚀电流密度icor1/(μA/cm2) 对数正态分布 均值：0.67，
标准差：0.392000 锈蚀电流密度icor2/(μA/cm2) 对数正态分布 均值：8.80，
标准差：5.102000 
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劣化等级 外观劣化程度的描述性准则(裂缝) 量化准则 A 无 p0≤1% B 局部有微小锈蚀裂缝，裂缝宽度小于0.3 mm p0 > 1%
且 p0.3≤1%C 裂缝较多，部分为顺筋连续裂缝，裂缝宽度在0.3 mm~3.0 mm之间 p0.3 > 1%
且p3.0≤1%D 大面积顺筋连续裂缝，裂缝宽度大于3.0 mm p3.0 > 1%
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表 3 模拟结果与实际损坏程度的对比
Table 3. Comparisons between the simulated results and the actual damage proportions
劣化等级 模拟结果/(%) 实际损坏程度 A 11 31/144=0.22 B 13 54/144=0.38 C 63 7/144=0.05 D 13 52/144=0.36
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