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RISS 인기검색어
- 검색키워드
- 저자 : B. Kövesdi (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Discussion on the Hot-Spot and Notch Stress Based Fatigue Assessment Methods Based on Test Results
B. J. Mecséri,B. Kövesdi 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.4
The focus of the current paper is the investigation of diff erent local stress calculation methods for fatigue design. To evaluate the accuracy and applicability of the hot-spot and eff ective notch stress (ENS) fatigue assessment methods an experimental and numerical research program is carried out at the BME Department of Structural Engineering, in Hungary. Two types of structural details are tested using 32 test specimens, a cruciform and a gusset plate type joint. The test results and the accompanying numerical calculation results are statistically evaluated and compared. Analysing the results of the fatigue tests and numerical calculations, it is concluded, that both the hot-spot and the ENS method could be used for fatigue design of the cruciform joints according to the recommendation of the IIW (Hobbacher in Recommendations for fatigue design, Springer, Paris, 2004). However, the rules of the ENS method needs improvement, if used for the design of gusset plate type joint. According to the current results, the ENS method can be adjusted to make applicable for the gusset plate joints as well, recommendation for that is presented in the current paper.
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Behaviour of CFST Stub Columns Subjected to Pure Compression
A. Horváth,D. Kollár,B. Kövesdi 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.4
Application of concrete-fi lled steel tubes (CFST) is becoming increasingly prominent in the civil engineering practice. However, the interaction of cross-sectional elements in CFST columns raises a number of questions, which have to be investigated in detail to improve design background and analytical resistance formulae. The aim of the current paper is to examine the structural behaviour of innovative concrete-fi lled steel tubes using diff erent structural steel grades (S355, S500 and S960) and concrete classes (C30/37 and C60/75). Combination of normal or high strength steel with normal or high-performance concrete is a novel research topic of composite structures resulting in economic and optimal design for distinct civil engineering applications such as buildings, bridges, towers and masts, etc. An advanced fi nite element model is developed and validated based on previous experimental results found in the international literature in order to investigate the discrepancies in structural behaviour, load-bearing capacity and failure mode of stub columns subjected to pure compression. Validated numerical results are compared to formulae-based resistances and the applicability of standardised design methods are examined. In addition, a novel formula is proposed considering hardening of steel material in accordance with EN 1993-1- 5. The developed formula can be used for the economic design of CFST stub columns, combining normal and high strength materials, where elastic shell buckling cannot occur ( D / t ≤ 90 ε 2 ).
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