Abstract Steel structures are often protected by paint coating, but the coating easily deteriorates at structural connections because moisture and dust accumulate at the contact. This leads to the local corrosion on the steel members near the contact and a reduction in tensile performance. The corrosion characteristics and tensile strength of steel plates with a concrete block are investigated. Four types of specimens were prepared, and each type had an unpainted area with different lengths away from the contact boundary. An accelerated cyclic corrosion test was conducted for 600 cycles using CCT-I test conditions specified in the ASTM D 6899–03 standard. To analyze the corrosion characteristics, the surface geometry of corroded specimens was measured in 1 mm × 1 mm intervals by an optical 3D measurement system. The average corrosion depth outside the concrete block was proportional to the unpainted area, and the average corrosion depth inside the concrete block was accelerated in unpainted areas. The two average corrosion depths have a power regression relationship, so the average corrosion depth inside the concrete block can be estimated from the average corrosion depth outside it. A simple method for quantitatively defining the residual thickness is proposed in terms of the effective thickness and the residual tensile strength, which can be evaluated using the effective thickness. Compared to previously proposed methods for this purpose, the effective thickness has higher accuracy.

中文翻译：

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评估涂漆钢在结构连接处局部腐蚀的抗拉强度

摘要 钢结构通常采用油漆涂层进行保护，但在结构连接处由于水分和灰尘在接触处积聚，涂层容易变质。这导致接触附近钢构件的局部腐蚀和拉伸性能的降低。研究了混凝土砌块钢板的腐蚀特性和抗拉强度。制备了四种类型的试样，每种类型都有一个距离接触边界不同长度的未涂漆区域。使用 ASTM D 6899-03 标准中规定的 CCT-I 测试条件进行了 600 个循环的加速循环腐蚀测试。为了分析腐蚀特性，通过光学 3D 测量系统以 1 mm × 1 mm 的间隔测量腐蚀试样的表面几何形状。混凝土砌块外部的平均腐蚀深度与未涂漆面积成正比，混凝土砌块内部的平均腐蚀深度在未涂漆区域加速。这两个平均腐蚀深度存在幂回归关系，因此混凝土砌块内部的平均腐蚀深度可以由其外部的平均腐蚀深度来估计。根据有效厚度和残余抗拉强度提出了一种定量定义残余厚度的简单方法，可以使用有效厚度进行评估。与先前为此目的提出的方法相比，有效厚度具有更高的精度。这两个平均腐蚀深度存在幂回归关系，因此混凝土砌块内部的平均腐蚀深度可以由其外部的平均腐蚀深度来估计。根据有效厚度和残余抗拉强度提出了一种定量定义残余厚度的简单方法，可以使用有效厚度进行评估。与先前为此目的提出的方法相比，有效厚度具有更高的精度。这两个平均腐蚀深度存在幂回归关系，因此混凝土砌块内部的平均腐蚀深度可以由其外部的平均腐蚀深度来估计。根据有效厚度和残余抗拉强度提出了一种定量定义残余厚度的简单方法，可以使用有效厚度进行评估。与先前为此目的提出的方法相比，有效厚度具有更高的精度。可以使用有效厚度进行评估。与先前为此目的提出的方法相比，有效厚度具有更高的精度。可以使用有效厚度进行评估。与先前为此目的提出的方法相比，有效厚度具有更高的精度。