PROBLEM TO BE SOLVED: To solve a problem in a building steel column-beam joint part wherein rectangular steel pipe columns are conventionally cut for every story of a building and built up by a through-diaphragm method, which is complicated and takes many manufacturing man-hours while causing the deterioration and deformation of diaphragm outer peripheral parts and inevitably requiring a large amount of welding by electroslag welding between a four-sided box column and diaphragms even without cutting the columns for every story, resulting in welding the diaphragms and the column with the superhigh heat input of 500-1,000 KJ/cm that easily causes cracks and deterioration such as lamellar tears of the column.;SOLUTION: Four-sided box-type steel pipe columns each with a plate thickness of 25 mm or more and a diameter of 400 mm or more are not cut for every story, but the end of an inner diaphragm provided with a protrusion with an outward open circumferential groove is welded to a through hole partially opened in the surface of the box-type steel pipe column, with a small amount of welding and low heat input. Further, an H-shaped steel beam is joined by welding at one weld part of multilayer welding including a though hole weld part.;COPYRIGHT: (C)2013,JPO&INPIT
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