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首页> 美国卫生研究院文献>Materials >The Corrosion Probability and Flexural Strength of an RC Beam under Chloride Ingress Considering the Randomness of Temperature and Humidity
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The Corrosion Probability and Flexural Strength of an RC Beam under Chloride Ingress Considering the Randomness of Temperature and Humidity

机译：考虑温度和湿度随机性的RC梁在氯气入侵下的腐蚀概率和抗弯强度

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摘要

The load capacity of reinforced concrete structure will decrease by chloride ingress in coastal region. In this paper, the corrosion probability and flexural strength of a typical reinforced concrete beam design under the influence of temperature and humidity was obtained by the Monte Carlo method. The relationship between flexural strength, temperature, relative humidity, and geometric parameters was established. The annual average temperature and relative humidity were treated as random variables together with the geometric size and concrete compressive strength. The corrosion probability and flexural strength in a wave splashing zone, coastal atmospheric zone, and offshore atmospheric zone were calculated. The results show that the corrosion probabilities of the three regions are obviously different. When the standard deviation of temperature is less than 1.5 °C, the temperature can be treated as a constant in the calculation of the concrete cracking probability in the wave splashing zone. A binary logistic regression formula was given to predict whether the randomness of temperature and humidity should be considered in the offshore atmospheric zone. When the standard deviation of the temperature is less than 1 °C, the temperature randomness has no significant effect on the flexural strength of beams in the wave splashing zone. The flexural strength distribution conforms to the normal distribution in the early stage of service and the Weibull distribution after concrete cracking.
机译：沿海地区氯化物的侵入会降低钢筋混凝土结构的承载能力。本文通过蒙特卡罗方法获得了典型钢筋混凝土梁设计在温度和湿度影响下的腐蚀概率和抗弯强度。建立了抗弯强度，温度，相对湿度和几何参数之间的关系。年平均温度和相对湿度与几何尺寸和混凝土抗压强度一起作为随机变量。计算了波浪飞溅区，沿海大气区和近海大气区的腐蚀概率和抗弯强度。结果表明，这三个区域的腐蚀概率明显不同。当温度的标准偏差小于1.5°C时，在波浪飞溅区中混凝土开裂概率的计算中可以将温度视为常数。给出了二进制逻辑回归公式，以预测在近海大气带中是否应考虑温度和湿度的随机性。当温度的标准偏差小于1°C时，温度随机性对波飞溅区中的梁的抗折强度没有显着影响。抗弯强度分布与服役初期的正态分布以及混凝土开裂后的威布尔分布一致。

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