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Reliability estimation of corroded RC structures based on spatial variability using experimental evidence, probabilistic analysis and finite element method

机译：基于空间变异性的实验证据，概率分析和有限元方法的基于空间变异性的腐蚀RC结构的可靠性估计

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摘要

Corrosion of steel reinforcement is spatially distributed over RC structures due to several factors such as different environmental exposure, concrete cover, and concrete quality, among others. Ignoring the effect of spatial variability is a drastic simplification for the prediction of the remaining service life of RC structures. Therefore, it is essential to identify the factors influencing the spatial steel corrosion and structural performance of corroded RC structures. In this paper, an experimental research is conducted to study the effects of main parameters (i.e. current density, concrete cover, rebar diameter, and fly ash) on the spatial variability associated with steel weight loss, corrosion crack, and structural behavior of accelerated-corrosion RC beams using X-ray radiography and digital image processing. The test results showed that low current density (I-corr = 5. 50 mu A/cm(2)) induced highly non-uniform corrosion associated with few large pits and cracks at certain locations while higher current density produced more uniform corrosion and cracks over the beam length. Gumbel distribution parameters were derived from the steel weight loss data for modeling spatial steel corrosion. A novel approach was established to assess the reliability of RC structures using finite element (FE) analysis and probabilistic analysis considering the effects of modeled spatial variability of steel weight loss based on X-ray photographs. Using the Gumbel distribution parameters derived from the steel weight loss data associated with higher current density may underestimate the non-uniformity of corrosion distribution which can lead to an overestimation of the load capacity of corroded RC structures.
机译：由于诸如不同的环境暴露，混凝土覆盖和混凝土质量等若干因素，钢筋腐蚀在空间上分布在RC结构上。忽略空间变异性的影响是对RC结构的剩余使用寿命预测的急剧简化。因此，必须识别影响腐蚀性RC结构的空间钢腐蚀和结构性能的因素。在本文中，进行了实验研究以研究主要参数（即电流密度，混凝土盖，钢筋直径和飞灰）对与钢重量损失，腐蚀裂纹和加速结构行为相关的空间可变性的影响 - 腐蚀RC光束使用X射线射线照相和数字图像处理。测试结果表明，低电流密度（I-Corr <= 5.50μmA/ cm（2））诱导与在某些位置的大坑和裂缝相关的高度不均匀腐蚀，而较高的电流密度产生更均匀的腐蚀和横梁长度裂缝。 Gumbel分布参数来自钢重量损耗数据，用于建模空间钢腐蚀。建立了一种新的方法，以评估使用有限元（Fe）分析和概率分析的RC结构的可靠性，考虑到基于X射线照片的钢重量损失的模型空间变异性的影响。使用从较高电流密度相关的钢重量损失数据衍生的牙龈分布参数可能低估腐蚀分布的不均匀性，这可能导致腐蚀的RC结构的负载能力过高。

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