Guidelines for Evaluation and Repair of Damaged Steel Bridge Members

Steel bridge members often are subjected to damage due to accidental impact, mishandling, or fire. Methods used for repair of such members include heat straightening and welding or bolting splices, replacement components, or reinforcement. At present, the decision to repair a damaged member, and the techniques used, are determined on the basis of the inspector's or engineer's evaluation of the situation, with little sound engineering information available for guidance. To place this decision-making process on a more rational basis, it is necessary to assemble information concerning the effect of these repair techniques on the service life, safety, performance, and maintenance of the structure. Decisions on method of repair must also consider the costs, user inconvenience, and esthetics of the repair technique. The objectives of this study were to provide guidance for the assessment of accidental damage to steel bridge members and to identify, develop, and evaluate the effectiveness of repair techniques. The main portion consists of a manual of recommended practice containing detailed procedures for evaluation of damage as well as information on repair techniques and the effects of those repairs. Information presented will be useful immediately in solving practical problems in bridge repair. Guidelines are presented for the following methods of repair: flame straightening, hot mechanical straightening, cold mechanical straightening, welding, bolting, partial replacement, and complete replacement.