COMPOSITE GIRDER HAVING SYMMETRIC STRUCTURE

摘要

The present invention provides a composite girder enabling a constructor to conveniently construct a bridge with a long span and having a stable structure by appropriately corresponding to bending moment. According to the present invention, the composite girder having a symmetric structure comprises: a pair of steel side plates (20) facing each other by being arranged at fixed intervals and having a vertically and horizontally symmetric structure, wherein each vertical height continuously decreases from the center to sides; a first steel pipe (32) connected along an upper end of the each steel side plate (20) at a fixed curvature; a second steel pipe (36) connected along a lower end of the each steel side plate (20) at the fixed curvature, wherein both ends are fixed to a bridge seat (16) installed in the upper part of an abutment (10); multiple steel partitioning plates (40) installed at fixed intervals from each other, wherein the each lower end is fixed to the upper side of the second steel pipe (36); and a steel cover plate (50) wherein the both horizontal ends are connected to the inner surface of the each steel side plate (20) and the lower surface is connected to the upper end part of the each steel partitioning plate (40).