| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem that since a panel has out-of-plane deformation when a panel zone is hollow whereby a bending moment applied to a beam can not be borne by a web in an elastic area, a section modulus of beam ends is the section modules of only a flange excluding the web, and thus the strength of beam ends is lowered, so that a larger beam than in the case of bearing the bending moment by the whole section of the beam has to be used and an extra beam depth is required, which results in an increase in the weight of a steel frame. SOLUTION: The thickness of a diaphragm is increased, and a backing board is arranged on an upper or lower face of the beam flange, the material strength of the beam flange is increased, the thickness of the diaphragm or the backing board is increased, a cutout is formed in the web, or a prestrain is applied by heat wiring a lower face of the beam. COPYRIGHT: (C)2011,JPO&INPIT
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