Variable-cross-section high-aperture-ratio steel beam structure

A variable-cross-section high-aperture-ratio steel beam structure comprises a profile steel beam and a main structure connected with the upper portion of the profile steel beam. The profile steel beam is a variable-cross-section beam in an irregular shape and is divided into three segments form the boundaries of the variable cross section, namely, two end segments and one mid-span segment. The beam height of the end segments is smaller than that of the mid-span segment, so that the height difference of the under-beam parts of the end segments relative to the mid-span segment forms first arrangement space of a construction pipeline; a beam web of the mid-span segment is provided with one or a group of holes arrayed in the beam length direction, and the holes form second arrangement space of the construction pipeline. According to the variable-cross-section high-aperture-ratio steel beam structure, the under-beam space in the variable-cross-section parts of the two ends of the profile steel beam and the hole space in the mid-span part of the profile steel beam are utilized for arranging the electromechanical pipeline, so that the use clear height of floors is effectively increased, the construction cost is effectively lowered, and great economic benefits and social benefits are achieved.