Steel composite PSC corrugated steel plate U girder

The present invention provides a steel composite PSC corrugated steel U girder. The girder comprises a concrete layer, a bottom flange of the girder, a top flange of the girder, and a pair of composite parts connected respectively to both sides of the bottom flange of the girder such that the pair of composite parts are provided at an upper distance larger than a lower distance in distance between composite parts, wherein the pair of composite parts includes corrugated steels, bottom combined members combining the corrugated steels and concrete of the bottom flange of the girder, and top combined members combining the upper portion of the corrugated steels and concrete of the top flange of the girder. The structure combining the top flange and the bottom flange of the girder on the upper portion and the lower portion of the corrugated steel so as to increase flexural rigidity of the corrugated steel, allow simple cross-section shape of the cross-section shape, easy construction short construction time, saved construction cost and easy bonding of steel materials between segments, and enhance the aesthetic property of a bridge.