1105.03(a) 1105.03 (c)
girder to deflect laterally during the heat -curving process will not cause the girder to overturn. If curved in the horizontal position, support the girder near its ends and at intermediate points, as necessary, to obtain a uniform curvature. Do not allow the bending stress in the flanges due to the dead weight of the girder to exceed the usual allowabl e design stress. Maintain intermediate safety catch blocks at the mid- length of the girder within 2 inches of the flanges at all times during the heating process to guard against a sudden sag due to plastic flange buckling.
the heat curving operation either before or after all the required welding of transverse intermediate stiffeners is completed. However, unless provisions are made for girder shrinkage, locate and attach connection plates and bearing stiffeners after heat curving. If longitudinal stiffeners are required, heat -curve or oxygen- cut them separately and then weld them to the curved girder. When cover plates are to be attached to rolled beams, attach them before heat curving if the total thickness of one flange and cover plate is less than 2 1/2 inches and the radius of curvature is greater than 1,000 feet. For other rolled beams with cover plates, heat-curve the beams before the cover plates are attached; either heat -curve or oxygen- cut cover plates separately, then weld them to the curved beam.
heat-cambering or cold cambering methods. For plate girders, cut the web to the prescribed camber with suitable allowance for shrinkage due to cutting, welding, and heat -curving. However, if permitted, correct moderate deviations from specified camber by a carefully supervised applicatio n of heat. Correct deviations from the specified camber according to Publication 135.
all welding and heating operations are completed and the flanges have cooled to a uniform temperature. Check horizontal curvature with the girder in the vertical position.
and round edges by grinding or other acceptable means. When AASHTO M 270 ( ASTM A709), Grade 50W, Grade HPS 70W, Grade HPS 100W, or ASTM A588, Grades A, B, and C weathering steels are specified for beams or girders, blast clean only the fascia side of exterior beams or girders according to SSPC -SP6, Commercial Blast Cleaning. At a minimum, blast clean from the top outside (fascia) edge of the top fl