Horizontal 2 dimensional behaviors and seismic performance of steel members with corrosion damages

在日本，许多钢结构都面临着老化的问题。这种老化的结构在大地震的作用下会造成严重的破坏。确保这些结构的抗震安全是必要的。然而，考虑腐蚀损伤的结构地震反应的二维水平特性研究很少。因此，在本研究中，为了评估矩形钢桥墩的二维行为，对矩形钢桥墩进行了角部腐蚀损伤试验。结果表明，不仅加劲板发生局部屈曲，而且桥墩角部也发生局部屈曲，角部有腐蚀。因此，与未发生腐蚀的桥墩相比，发生腐蚀的桥墩强度劣化明显。因此，适当的维护是必要的，这样结构就不会在大地震中受到严重的破坏。

Many steel structures have been faced the problem of deteriorationin Japan. Severe damages will be caused in such deteriorated structures subjected to hugeearthquake. It is necessary to secure safety of such structures to earthquakes. However, 2dimensional horizontal behavior of seismic response of structures with damages bycorrosion has been hardly researched. Therefore, in this study experiments intended forrectangular steel bridge piers with damages by corrosion in the corners were conducted inorder to evaluate two-dimensional behavior. It was found that local buckling occurred atnot only the stiffened plates but also the corners in the piers which have corrosion at thecorners. Therefore, compared with a pier without corrosion, deterioration of strength of thepier with corrosions was remarkable. As a conclusion, suitable maintenance is necessary sothat structures may not receive severe damage in huge earthquake.