ABSTRACT
There have been found a lot of corrosion damages recently in steel bridges aged for fifty or more years. The engineers are paying great attention to the importance of maintenance of them. If the strength of a steel structure is decreased by serious corrosion damages, the structure must be repaired to ensure its safety. In order to supplement the strength loss of a steel member with local corrosion, plate-patches-repairing is often adopted, where the corroded area is covered with plate bonded by adhesive. However, this method cannot be necessarily available in some complicated situation. For example, the panel point of diagonal member and hanging member and the girder-end which has cross beam and bracing members. Therefore, we devised a repair method using stud and rebars wrapped in resin in order to repair more easily than those repair method.
The purpose of this study is to investigate the ultimate behavior of corroded members repaired by the proposed method, to clarify the effect of the method and to propose the design method for actual application. We conducted axial tensile test and axial compression test for the steel plate and cruciform column with corroded surfaces repaired by the method. The test specimen for axial tensile test is shown in Figure 1. Test specimen for axial tensile test. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315207681/cd556cd4-4dcf-4efe-8e29-56fc67b8bfbd/content/fig357_1.tif"/>
Then, those corroded surfaces are made artificially by drilling due to “surface generation method” developed by Fujii et al. (2004). It can be comprehend the renovation effects quantitatively, because it can make the same corroded surface. The thickness distributions of corroded region in axial tensile test are shown in Figure 2. Thickness distribution of corroded area in tensile test. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315207681/cd556cd4-4dcf-4efe-8e29-56fc67b8bfbd/content/fig357_2.tif"/>
It is concluded from the test results that this method can complement the strength lack caused by corrosion effectively in both of tensile members and compressive members, and that the design method can be also shown.
