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RISS 인기검색어
- 검색키워드
- 저자 : Alireza Sadat Hosseini (검색결과 2 건)
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Alireza Sadat Hosseini,Mohammad Reza Bahaari,Mohammad Lesani 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.6
This paper describes numerical investigations conducted on a tubular T-joint strengthened by FRP composites under in-plane bending (IPB) and out-of-plane bending (OPB) moments. The FRP materials were applied as a protective layer on the T-joint, and the analyzed models were eventually validated against the results obtained from an experimental study. The eff ectiveness of using FRP materials on enhancing the fatigue life of a tubular T-joint was investigated through computing the relative SCFs of 150 fi nite element models using ABAQUS software package. Analyses have been performed to investigate diff erent FRP parameters such as fi ber orientation, FRP thickness, wrapping length and FRP material properties of the wrapped joint. Eff ectiveness of these FRP parameters on SCF reduction along with the most effi cient lay-ups against both IPB and OPB moments were reported. According to the results of this study, further reduction in SCFs was observed when the joint was confi ned with stiff er FRPs. SCF reduction of around 15% was observed for only a 1 mm thick CFRP layup. Moreover, using a thicker FRP layup tends to increase its eff ectiveness signifi cantly. However, it was observed that increasing the FRP wrapping length has negligible eff ect on SCF values, and has to be chosen so as to cover all the chord surface area infl uenced by the brace loading in order to balance the state of stresses and deformations.
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Alireza Sadat Hosseini,Mohammad Reza Bahaari,Mohammad Lesani 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.5
Stress concentration factors (SCF) of steel tubular T/Y-joints strengthened with diff erent types of fi ber reinforces polymer (FRP) materials were studied thoroughly under the action of in-plane bending (IPB) and out-of-plane bending (OPB) moments. A comprehensive FE study was carried out through examining diff erent elements for steel substrate and FRP material along with the corresponding contact modeling to attain reliable results substantiated by existing SCF experiments. Shell-to-Solid contact using the node-sharing technique showed the best performance in conformity with the SCF experimental results. Such benchmark modeling was substantiated with additional verifi cations against the available experimental data on SCFs in T, Y, and K connections. Numerous FE models were then developed to put the most aff ecting FRP and joint parameters into perspective, while previous studies lack addressing all in one go. It was found that the geometry of the connection has a signifi cant infl uence on the level of FRP eff ectiveness. For instance, the sensitivity of SCF in a Y-joint to FRP strengthening is less than a T-joint with similar geometry, due to the diff erent brace-to-chord angles. Justifi ed with analytical interpretations, cumulative eff ects of all parameters were carefully evaluated to derive SCF formulas for FRP strengthened tubular T/Y-joints under both IPB and OPB moments. Their accuracy and applicability were checked with the well-known statistical indices, and it was seen that the correlation of coeffi cients was higher than 95%. Moreover, the proposed SCF formulas meet all the acceptance criteria of the Fatigue Guidance Review Panel.
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