The 17th Taiwan - Korea - Japan Joint Seminar on Earthquake Engineering for Building Structures
巻, 号, ページ
pp. 121 - 131
出版年月
2015年9月
出版者
和文:
英文:
会議名称
和文:
英文:
The 17th Taiwan - Korea - Japan Joint Seminar on Earthquake Engineering for Building Structures
開催地
和文:
神奈川県横浜市
英文:
Yokohama, Kanagawa
アブストラクト
In Steel Framed House, built-up member is used for stud. Usually, stud is composed by two light gauges and interconnected by self-drilling screws. In Japan, flexural buckling strength of light gauge built-up compression member is evaluated by effective slenderness ratio that is specified in the Design Standard for Steel Structure. The formula specified in the Standard is based on Bleich’s assumption which was applied for heavy section. From this reason, it is questionable that the formula specified in the Standard can be directly applied in light gauge. Firstly, full scale testing were conducted to clarify this issue. Batten type light gauge built-up members were used for specimens in this study. Connectors and chords were connected by pretention bolts. Length of the members were determined to have flexural elastic buckling. From the testing, un-conservative results were observed from all specimens when the flexural buckling strength were evaluated according to the Standard. Additionally, bending moment distribution at the chord that were computed from strain gauge reading differed from Bleich’s assumption. Secondly, energy equilibrium theory was used to derive flexural elastic buckling strength of the built-up members. Moreover, modified effective slenderness ratio was proposed for light gauge built-up members. The effects of distance between connectors and separation between chords were included in the formula. Proposed formula was arranged to show these two parameters clearly. Finally, supplemental results were obtained from finite element analysis to verify the proposed formula. From full scale testing and parametric finite element analysis, good agreements were observed from all test specimens when the flexural elastic buckling strength were evaluated according to proposed modified effective slenderness ratio. Compared to Standard, good agreements and improved results were observed from all analysis models when the flexural elastic buckling strength were evaluated according to proposed modified effective slenderness ratio.
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