| 摘要 |
PROBLEM TO BE SOLVED: To provide a buckling restraining-type axial force bearing member which is composed of a steel core having a cruciform cross section and four restraining members each formed of an angle steel, wherein the axial force bearing member can sufficiently exert a restraining effect against partial buckling without additionally providing special members, and makes the 100% use of the energy absorbing ability of the core. SOLUTION: The buckling restraining-type axial force bearing member 1 is formed by arranging a yielding portion 2A at an axial intermediate portion of the core steel plate 2 having the cruciform cross section, attaching mounting portions 2B to both ends of the same, for mounting the axial force bearing member on a structure, attaching the four restraining members 3 each formed of the angle steel to the yielding portion 2A having the cruciform cross section so as to exhibit a cruciform cross section, and connecting each pair of the restraining members 3 pinching each piece of the core steel plate 2 by means of spacers 4, bolts 5, and nuts 6. Herein the thickness Ta of the restraining member 3 is set to satisfy the relationship of Ta≥0.4×Tc, and the pitch p of the bolts assembling the restraining members 3 is set to satisfy the relationship of p≤50×Tc (Tc: plate thickness of the core). Thus when the core is expandably and contractibly deformed due to an external force such as an earthquake, the axial bearing member is subjected to yield deformation without being buckled at the time of contraction. COPYRIGHT: (C)2007,JPO&INPIT
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