We have investigated experimentally by electric wire strain gauges the stress distribution in the T-section beams in the case of bending loads, when they were supported at both ends and carrying a centrally concentrated load as the upper chord members of E.O.T. Crane girders. The principal results of the investigation may be summarized as follows : (1) The near part of the loaded point of the upper horizontal plate (flange plate) has a tendency to bend separately from the total bending state. (2) The reduction ratio of strength of the T-section beam was about 10∼20%, in which the width of flange plate is smaller than three times the depth of web plate.