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朴祥鎭,朴英錫,鄭時潤,鄭泰周 명지대학교 공학기술연구소 1992 공학기술연구소 논문집 Vol.7 No.-
Generally, an orthotropic steel plate deck bridge is called an "orthotropic bridge". The orthotropic bridge deck consists of thin steel plate stiffened longitudinal ribs at right angles to the floor beams. As the rigidities of the ribs and floor beams are generally of unequal magnitude, elastic behaviour is different in each of these two main directions. Because ribs and floor beams are orthogonal and because their elastic properties are different, the system became known as orthogonal-anisotropic, or, briefly, orthotropic. Mathematically, this elastic property is described by Hook's law. Further, we assume that it is homogeneous. Of all the methods considered in deck analysis, the most practical is that of Pelican and Esslinger. In this method, the deck system is a continuous orthotropic plate, rigidly supported by its main girders and elastically supported by the floor beam. The design of steel plate decks with open or closed ribs is made in two computation steps. In the first step, it is assumed that the floor beams are infinitely rigid. In the second step, the effects of the floor beam elasticity are considered. M"uller-Breslau Theory and 3 moment-equation are used to analyze the behaviour of the continuous beam on elastic and rigid supports. Many procedure are programmed in order to accomplish the economic design and accuracy.
李容準,李明雨,朴英錫,鄭時潤 명지대학교 공학기술연구소 1991 공학기술연구소 논문집 Vol.6 No.-
Numerical model for predicting the deflections and stress distribution due to creep and shrinkage of concrete and relaxation of prestressed steel of the segmentally erected indeterminate prestressed concrete bridge is presented in this paper. The computer program considering the presence of the reinforcement, the difference in ages of the concrete segments, the multiple stages in which the external loads and prestressing forces are applied, and the changes in geometry and support conditions as the construction progresses is developed. The proposed method is applied to a three-span continuous bridge and four-span continuous bridge, and the results indicate the significance of the time-dependent effects.