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Anaphat Manovachirasan,Songsak Suthasupradit,최준혁,김범준,김기두 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.5
The crucial diff erences between conventional rail with split-type connectors and continuous welded rails are axial stress in the longitudinal direction and stability, as well as other issues generated under the infl uence of loading eff ects. Longitudinal stresses generated in continuously welded rails on railway bridges are strongly infl uenced by the nonlinear behavior of the supporting system comprising sleepers and ballasts. Thus, the track structure interaction cannot be neglected. The rail-support system mentioned above has properties of non-uniform material distribution and uncertainty of construction quality. The linear elastic hypothesis therefore cannot correctly evaluate the stress distribution within the rails. The aim of this study is to apply the nonlinear fi nite element method using the nonlinear coupling interface between the track and structural model and to illustrate the welded rail behavior under the loading eff ect and uncertain factors of the ballast. Numerical results of nonlinear fi nite analysis with a three-dimensional solid and frame element model are presented for a typical track–bridge system. A composite plate girder, modeled by solid and shell elements, is also analyzed to consider the behavior of the welded rail. The analysis result showed buckling under the independent calculations of load cases, including ‘temperature change’, ‘bending of the supporting structure’, and ‘braking’ of the railway vehicle. A parametric study of the load combination method and the loading sequence is also included in this analysis.
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Panot Chobsilprakob,김기두,Songsak Suthasupradit,Anaphat Manovachirasan 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.1
The design of cable supported bridge with long span is challenging due to the sensitivity of the dynamic excitation. Theaerodynamic instability caused by fluttering can severely affect the safe operation. An application of indicial function to the flutteranalysis in time domain is applied to the Great belt East Bridge for both completed and erection stage. The nonlinear least squaremethod was used to extract the aerodynamic indicial parameters for flutter analysis in time domain. The geometric nonlinearityis considered through the nonlinear dynamic analysis. The results showed the good agreement with the wind tunnel test and thevalidity of the indicial function as well as the important role of the geometrically nonlinear analysis during deck erection.
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