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RISS 인기검색어
- 검색키워드
- 저자 : Deshan Shan (검색결과 2 건)
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Lingfeng Luo,Deshan Shan,Miao He 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.10
This paper presents an accurate sampling method for suspension-bridge finite element (FE) model updating. The proposed method utilizes a coupled suspension-bridge modeling approach, which integrates a numerical shape-finding method with conventional FE analysis to efficiently achieve parametric modeling during the sampling process. This study also employs the Nelder-Mead algorithm (NMA) to ensure the efficiency and robustness of the numerical shape-finding calculation. First, the accuracy of the NMA-based coupled modeling approach is examined by numerical investigation of the baseline model of an actual suspension bridge. Then, the computational results of two groups of samples with different sample sizes are compared to test the efficiency of the proposed method. Finally, by relying on the structural health monitoring (SHM) system of this bridge, the measured natural frequencies over half a year are identified, and almost all of them are within the calculated sample space.Therefore, the feasibility of the proposed suspension-bridge FE model sampling method is validated by the uncertainties of the measured responses over half a year.
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Zhigang Yu,Deshan Shan 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.3
Reinforced concrete girders of curved cable-stayed bridges are subjected to the combined loads of compression-bending-shear-torsion, which can result in complex interaction behaviours. This paper presents an experimental study conducted to understand the behaviours of T-shaped reinforced concrete columns subjected to the combined loads of compression-bending-shear-torsion. The main variables considered in this study are axial pressure ratio and torsional change. The results of tests on twelve reinforced concrete columns subjected to the combined loads are obtained, and the effects of combined loads on the bending strength are discussed. This paper presents the formula established for calculating the bending strength and the diagrams of interaction under the combined loads of compression-bending-shear-torsion. Particularly, the results highlight the turning point from the bending failure to the compression failure, and demonstrate that bending capability increases within the specified range of axial pressure ratio and decreases with the increasing torsion. In addition, this study indicates the importance of considering the effects of compression, shear and torsion on bending strength in the engineering design.
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