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RISS 인기검색어
- 검색키워드
- 저자 : Meiling Zhuang (검색결과 2 건)
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Meiling Zhuang,Changqing Miao,Rongfeng Chen 대한토목학회 2019 KSCE Journal of Civil Engineering Vol.23 No.6
A fatigue design method for the orthotropic steel deck bridges is proposed. The stress characteristics of welded details are analyzed using the finite element method. Based on the fatigue performance, the structural parameters of the orthotropic steel decks (OSDs) are optimized using the combination BP (back propagation) neural network and genetic algorithms (GA). The calculated results demonstrate that the weld stresses at the deck plate-to-rib, deck plate-to-rib-to-diaphragm welded details are mainly bending stress while those at the rib-to-rib welded details are mainly membrane stress. The fatigue stress of each weld is deeply affected by the transverse and longitudinal direction positions. The local effect of stress distribution of all welded details is remarkable. The calculated results obtained using the proposed model are in good agreement with those obtained using ANSYS and the errors are within 5%. The optimal structural results are highly influenced by the applied wheel loadings, while the optimal results for the deck thickness and the U-rib opening size are highly influenced by temperature. Especially on the ordinary lane, temperature has a great effect on the fatigue performance for all welded details.
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Rou Li,Changqing Miao,Meiling Zhuang 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.5
Fatigue crack initiates from corrosion pits in various metallic structures, leads to the decline of the fatigue life. In the present study, the effects of the width, depth, angle and spacing of primary and secondary pits on failure mechanism and stress concentration factor are investigated by the experimental and numerical analysis. The results show that depth-width ratio of corrosion pits is the critical factor that affects the dangerous area and stress concentration factor. The development of secondary pits will lead to the multiplier effect of stress concentration factor. The maximum stress is basically located at the mouth or middle part of secondary pits. In addition, the pit angle does not change the distribution of dangerous area, but with the pits angle increasing, the stress concentration factor increases as a whole. The contours that classical butterfly-like distribution rotates and the rotation angle is basically the same with that of the corrosion pits. Furthermore, with the pits spacing increasing, the stress concentration factor increases gradually and converges to the fixed value, which is equal to the stress concentration factor under the single pit. Finally, the relationship between the pits parameters and stress concentration factor is systematically predicted.
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