Abstract

Corrosion is one of the most important problems and is an inevitable event in metal structures exposed to environmental effects. Corrosion deterioration usually forms in steel and steel-concrete composite bridges and marine structures. Bolted connections in steel structures are the preferred connection types because of their ease of assembly and high strength. In this study, corrosion damages were created in steel plates with bolted connections and the axial load strength, ductility and behaviour of the steel members were investigated. Axial tensile tests have been carried out on steel plates with bolted connections exposed to corrosion at different rates (10% and 20% by mass). According to the axial tensile tests, decreases in average yield strength and average yield strain values were determined as 4% and 10% for 10% corroded specimens, and were determined as 16% and 27% for 20% corroded specimens having 4 mm thick plates, respectively. Similarly, for specimens having a thickness of 6 mm plate, average yield strength and average yield strain values decreased 3% and 5% for 10% corroded specimens, and 13% and 14% for 20% corroded specimens, respectively. Also, it was found that the ultimate strengths and average rupture strains decreased almost proportionally to the amount of corrosion. In addition, finite element analysis was performed in ANSYS program for bolted connections examined experimentally. In terms of ultimate tensile strength, the results were obtained with an average error of 4% in non-corroded 4 mm specimens and 6% in 10% and 20% corroded 4 mm specimens. For 6 mm plate thickness, these values of non-corroded, 10% and 20% corroded specimens were obtained as 9%, 5% and 3%, respectively.

摘要

腐蚀是最重要的问题之一，是暴露于环境影响的金属结构中不可避免的事件。腐蚀劣化通常发生在钢和钢-混凝土组合桥梁和海洋结构物中。钢结构中的螺栓连接是首选的连接类型，因为它们易于组装且强度高。在这项研究中，对螺栓连接的钢板造成了腐蚀损伤，并研究了钢构件的轴向载荷强度、延展性和性能。对螺栓连接钢板以不同速率（10% 和 20% 质量）暴露在腐蚀下进行了轴向拉伸试验。根据轴向拉伸试验，对于 10% 腐蚀的试样，平均屈服强度和平均屈服应变值的降低确定为 4% 和 10%，对于具有 4 毫米厚板的 20% 腐蚀试样，分别确定为 16% 和 27%。类似地，对于厚度为 6 mm 板的试样，10% 腐蚀试样的平均屈服强度和平均屈服应变值分别下降 3% 和 5%，20% 腐蚀试样分别下降 13% 和 14%。此外，还发现极限强度和平均断裂应变几乎与腐蚀量成正比地下降。此外，在 ANSYS 程序中对实验检查的螺栓连接进行了有限元分析。就极限抗拉强度而言，未腐蚀的 4 毫米试样的平均误差为 4%，而 10% 和 20% 的腐蚀 4 毫米试样的平均误差为 6%。对于 6 mm 板厚，未腐蚀、10% 和 20% 腐蚀试样的这些值为 9%，