1995 Fiscal Year Final Research Report Summary
Studies of Elasto-Plastic Behavior of Steel Braces under Cyclic Axial Force and its Fracture
| Project/Area Number |
05650543
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Building structures/materials
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| Research Institution | Science University of Tokyo |
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Principal Investigator |
HIRANO Michikatsu Sciebce Univ. of Tokyo, Facultu of Eng., Professer, 工学部第一部, 教授 (80084359)
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| Co-Investigator(Kenkyū-buntansha) |
HODUMI Hideo Sciebce Univ. of Tokyo, Facultu of Eng., Reserch Associate, 工学部第一部, 助手 (10084336)
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| Project Period (FY) |
1993 – 1995
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| Keywords | Brace / Crack / Local Buckling / Absorbed Energy / strain hysteresis |
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| Research Abstract |
B races sometimes fracture in an early phase of a load hysteresis. It is the purpose of this study to elucidate a structural characteristic of a steel member under a cyclic axial force and its strain hysteresis until crack occurs in its local buckling section. Specimen was made of a cold formed steel tube, cold roll-formed steel spuare tube, and welded H steel. Experimental variables were slenderness ratio, width-thickness ratio, free nitrogen content, and existence of heat treatment.
Main findings were as follows.
1 A stain concentration occurred in a local buckling section. With the in crease of deformation amplitude, the stain amplitude in the concentrated portion increased and reached dozens of percent.
2 Deformation capacity up to fracture depended on its shape of section and width-thickness ratio, and a steel square tube which has a greater width-thickness ratio reached an earlier fracture.
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