Evaluation and Repair of Wrought Iron and - Purdue e-Pubs ...

124The second corrosion pattern modeled was section loss from corrosion throughthe entire cross section of the eyebar including the area around the pin hole (Eyebar B).As before, material was removed to half the thickness of the eyebar, as is shown in Figure3.28. This corrosion pattern was considered to be the most severe situation that could befound on an existing bridge since it involved the effective net section of the eye. Fillerweld was placed in the removed area according to the procedure outlined in Appendix D.Both eyebar connections were tested in tension and failed in the shank of theeyebar, showing that the weld repair did not reduce the strength of the eyebar. Therefore,if it is found necessary to repair an eyebar in this manner, then a procedure similar to thatoutlined in Appendix D for filling in the corroded area with a filler weld should befollowed.If the eye connection of the eyebar is too corroded to repair using a filler weld, theeye could be removed and a new eye could be attached to the existing eyebar using a fullpenetration groove weld. This repair should be located in the shank of the eyebarmember at a section at least two times the eye head diameter from the fillet region. Alsothe repair, should be done using a weld detail and procedure similar to the groove weldthat was determined adequate from testing in this study. A detailed description of thewelding procedure for the butt joint groove weld is described Appendix D.Along with the eyebars, diagonals in existing iron truss bridges are also prone toexcessive corrosion near the connection joints. When this occurs it is often advisable toeither replace the diagonal member or the section of the member that has experienced thecorrosion.Typically, a moderate amount of corrosion is present on members in existingbridges. This corrosion usually consists of mild pitting and slight corrosion over theentire surface of the members. When rehabilitating an existing bridge, it is beneficial to