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Title |
Numerical Analysis for Dynamic Characteristics of Next-Generation High-Speed Railway Bridge
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Authors |
오순택(Soon-Taek Oh) ; 이동준(Dong-Jun Lee) ; 이성태(Seong-Tae Yi) ; 정병준(Byeong-Jun Jeong) |
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DOI |
https://doi.org/10.11112/jksmi.2022.26.2.9 |
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Keywords |
PSC 박스 거더교; 38-자유도; 주행 안정성; 동적확대계수; 회귀분석식 PSC (Pre-Stressed Concrete) box girder bridge; 38-degree-of-freedom; Traffic safety; DAF (Dynamic amplification factor); Regression equation |
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Abstract |
To take into account of the increasing speed of next generation high-speed trains, a new design code for the traffic safety of railway bridges is required. To solve dynamic responses of the bridge, this research offers a numerical analyses of PSC (Pre-stressed Concrete) box girder bridge, which is most representative of all the bridges on Gyungbu high-speed train line. This model takes into account of the inertial mass forces by the 38-degree-of- freedom and interaction forces as well as track irregularities. Our numerical analyses analyze the maximum vertical deflection and DAF (Dynamic Amplification Factor) between simple span and two-span continuous bridges to show the dynamic stability of the bridge. The third-order polynomial regression equations we use predict the maximum vertical deflections depending on varying running speeds of the train. We also compare the vertical deflections at several cross-sectional positions to check the influence of running speeds and the maximum irregularity at a longitudinal level. Moreover, our model analyzes the influence lines of vertical deflection accelerations of the bridge to evaluate traffic safety.
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