A STEEL FRAME GIRDER LOWERING THE STORY-HEIGHT AND A CONSTRUCTION PROCESS USING IT

摘要

The present invention relates to a construction method using the floor height reduction type cheolgolbo to reduce the story height of the high-rise building and improves proof stress, and more specifically, the lower flange is formed with a wider reinforcing structure to the I-beams of asymmetric cross section to be formed than the top flange the floor height reduction type cheolgolbo and which relates to a construction method using the same, according to cheolgolbo for use in steel frame building, the asymmetric cross-section I-beam (1) the use, the width of the upper flange of the I-beam (1) in cheolgolbo (a) and lower flange width (b) the size ratio of 1: 1.5-2.5 with, characterized in that for fixing the reinforcing plate (2) vertically between the upper flange and lower flange by welding, and the floor height reduction type cheolgolbo and a construction method using as its features.