Heat-straightening Repair of Damaged Steel Bridge Girders: Fatigue and Fracture Performance
Transportation Research Board, Jan 1, 2008 - Bridges, Iron and steel - 129 pages
This report summarizes the results of a project to establish limits, based on fatigue and fracture performance, on the number of damage and repair cycles to which damaged steel bridge girders may be subjected using the heat-straightening procedure. A key product presented here is suggested revisions to the Federal Highway Administration (FHWA) manual of practice for heat straightening. The report will be of particular interest to engineers in state highway agencies and industry responsible for bridge maintenance and repair.
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Chapter 2 Findings
Chapter 3 lnterpretation Appraisal and Applications
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AASHTO analysis bending bottom flange brittle fracture Category compression members compressive stresses conducted cracks Damage Cycle damage/repair cycles damaged and repaired decrease degree of damage determine drop-weight machine ductility Evaluation eyebars fatigue and fracture Fatigue Detail FE modeling FHWA manual flange attachment flange material flange thickness flange width fracture performance fracture toughness ft-lb ground smooth heat-straightening repair heating patterns height of damage increase inspection jacking forces length of damage limits lmpact opposite side load localized damage material properties NCHRP Number of Cycles occurred percent Plate Girder procedure reduced repair cycle repair process repair weld residual damage residual stresses Runout lmpact opposite Runout lmpact point SAF equation shell element shown in Figure side of stiffener Specimen 2D/R-1 strain gage stress range taken from flange temperature Tensile specimens tensile strength tensile stress three D/R cycles undamaged vee heats weld toe welded details yield strength yield stress