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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AASHTO bending bottom ﬂange brittle fracture Category compression members compressive stresses conducted Cover Plate cracks D/R cycles Damage/Repair Cycles damaged and repaired degree of damage drop-weight machine ductility fatigue and fracture fatigue testing FE modeling FHWA manual ﬁeld ﬁrst Flange ﬂange attachments ﬂange material ﬂange thickness ﬂange width fracture performance fracture toughness ground smooth heat-straightening repair heating patterns height of damage Impact opposite side Impact point increase inﬂuence inspection length of damage load localized damage material properties percent Plate Girder repair cycle repair process repair weld residual damage residual stresses Runout Impact opposite SAF equation shell element shown in ﬁg shown in Figure side of stiffener signiﬁcant speciﬁc specimen 2D/R-1 steel stiffeners welded straightening strain gage strain ratio stress range taken from ﬂange temperature Tensile specimens tensile strength tensile stress transverse stiffeners undamaged vee heats weld toe welded details yield strength yield stress