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Title |
Analytical Evaluation of Behavior of Precast PSC Box Curve Bridge Based on Design Variables
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Authors |
김성배 ; 김성재 ; 박정천 ; 엄기하 ; 김장호 |
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DOI |
https://doi.org/10.4334/JKCI.2014.26.3.267 |
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Keywords |
PSC 곡선교 ; 유한요소해석 ; 매개변수 ; PS 도입량 curved PSC bridge ; finite element analysis ; effective variables ; prestressing force |
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Abstract |
Recently, the construction of curved bridge has increased, thus researchers perform the analytic studies on PSC curved bridge. However, the grid analysis method that are mostly used in the construction industry is not adequate to acquire the precise behavior evaluation of curved PSC briges. Therefore, the precise finite element analysis considering the effective variables were performed to establish the basis for the design method of curved PSC bridge by using 3D elements and bar element. The evaluated variables in this analysis were the number of girders, loading point, section figure, change of prestressing force. The results show the load carrying capacity of the 3 girder type bridge is 200% of that of the 2 girder type, and that applying load on outer girder makes the load resistance capacity and the deflection deviation of 2 girders smaller. The structural capacity of the bridge is improved when the section size is increased, but the efficiency of it is not sufficient enough compare to that of the change of prestressing forces. The change of prestressing forces shows that the camber and the load carrying capacity are linearly increased as PS force is increased. Moreover, when the PS force applied on outer girder is increased than that of inner girder, the deviation of deflection the girders decreases, thereby the stability of the bridge is enhanced.
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