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Tests were made to determine the effect of constraint caused by geometrical shape and by differences in temperature on the ductile behavior of welded structures. Four large box girders of identical design were fabricated from fully killed steel from the same heat. The box girders were tested as simply supported beams, one girder being tested at each of the following temperatures: —40°, 0°, 40°, and 80° F. The girders tested at —40° and 0° F broke with a square type of fracture. The other two girders could not be broken with the available equipment, although deflections at midspan of more than 16 inches were induced on a 22-foot span. The results of these tests are discussed and compared.

Bending tests of large welded-steel box girders at different temperatures