• 발명특허
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• v.4 no.6 s.40
• /
• pp.11-13
• /
• 1979

• KOREAN POULTRY JOURNAL
• /
• v.23 no.11 s.265
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• pp.42-45
• /
• 1991

• 종축개량
• /
• v.18 no.6
• /
• pp.105-112
• /
• 1996

• 정보화사회
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• s.13
• /
• pp.17-17
• /
• 1988

• 주택과사람들
• /
• s.160
• /
• pp.25-27
• /
• 2003

• Cement Symposium
• /
• no.6
• /
• pp.65-73
• /
• 1978

• 발명특허
• /
• v.16 no.5 s.183
• /
• pp.38-45
• /
• 1991

• Korean Architects
• /
• no.9 s.37
• /
• pp.36-46
• /
• 1971

• Journal of Korean Society of Steel Construction
• /
• v.10 no.3 s.36
• /
• pp.497-508
• /
• 1998

The objective of this study is to examine fatigue behavior of as-welded butt-welded joints with incomplete penetration from fatigue tests. The test results are the following. In static tests, tensile strength and yield strength of butt-welded joints are constant regardless of incomplete penetration. And in fatigue tests, fatigue strength of fully penetrated butt-welded joints satisfies fatigue limits, prescribed in Korean Specifications and JSSC, respectively. The results show that as the magnitude of incomplete penetration increases, fatigue strength decreases. In fractured surfaces, full and incomplete penetration specimen show different shapes, it is because that stress concentration factor vary with structural geometry in bead toe and root tip, and certify in FEM analysis. This study suggests that defects such as incomplete penetration from welding must be avoided in order to attain the sufficient life of steel structures.

• Journal of Korean Society of Steel Construction
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• v.16 no.2 s.69
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• pp.181-190
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• 2004

A new inelastic design method performing iterative calculations using secant stiffness was developed. Since the proposed design method uses linear analysis, it is convenient and stable in numerical analysis. At the same time, the proposed design method can accurately estimate the inelastic strength and ductility demands of the members by performing iterative calculation. In the present study, the procedure of the proposed design method was established. Design examples using the proposed method were presented, and its advantages were highlighted by comparisons with existing design methods using elastic or plastic analysis. Unlike the existing inelastic design methods performing the preliminary design on the structure and checking its validity using nonlinear analysis, the proposed integrated analysis-design method can directly calculate the strength and ductility demands of each member. In addition, the proposed design method can address the inelastic design strategy intended by the engineer, such as strength and ductility limits of members and the design concept of strong-column and weak-beam. As a result, economical and safe design can be achieved.