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이동욱(Dong Uk Lee),고남호(Nam Ho Ko) 한국강구조학회 1993 韓國鋼構造學會誌 Vol.5 No.3
Closed U shape trough rib is widely used because it is strong in stiffness as stiffener of deck plate, uniformly in distribution of loading, and light in weight of member in steel box girder bridge. It also prevented rust because of its perfectly closed section. Welding distortion becomes little since welding process is reduced in elevated bridge and long span of the steel box girder bridge with the closed U shape trough rib. Torsional moment occurs in cross section of steel box girder badge. Resistance and shearing stress of torsion are compared and examined in steel hox girder when opened rib and closed U shape thought rib are attached at the steel deck plate respectively. The test specimen which is the closed U shape trough rib is manufactured as full scale model and carried out by static bending test and fatigue test. The stress behavior is examined on cross section of the close U shape trough rib from the static bending test and the fatigue test. The stress of closed U shape trough rib is obtained from 3 dimensional stress analysis by finite element method. The results obtained from this study are as follows: The torsion is almost burdened on the steel box girder when the opened rib and the closed U shape trough rib are attached at the box girder respectively. The torsinal resistance of closed U shape trough rib is larger than that of opened rib when opened rib and L1 shape trough rib are attached to deck plate in the steel box girder respectively. The shear lag by shearing distortion occurs not only corner of the U shape trough rib in the static bending test and the fatigue test, but also in the 3 dimensional stress analysis by the finite element method. Accordingly, it is necessary to take the counterplan fur the shear lag in case the closed U shape trough rib is used as the stiffener of hox girder.
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추정교통량에 의한 교량강상판의 내용수명 평가법에 관한 연구
이동욱(Dong Uk Lee),김태호(Tae Ho Kim),고남호(Nam Ho Ko) 한국강구조학회 1993 韓國鋼構造學會誌 Vol.5 No.1
Recently, endurance fatigue life in a long span bridge has been lively studied together with investigation of superannuated bridges. Design load of bridge and the damage of deck plate have been examined from the report of the investigation of superannuated bridges. In this paper, it can be seen that the damage of Deck plate is caused by crack and abrasion because numerous passing vehicles and overweight vehicles pass through the bridge. In the design of a long span bridge, steel plates are much used to reduce self-weight, so that deck plate is finely cracked in such a heavy structure as steel bridges. Accordingly, the distribution of the volume of future estimated passing vehicles are obtained from the statistics of the volume of traffic passing through Seoul-Pusan expressway. The volume of the estimated passing vehicles is calculated by the number of equivalent axle load cycle, and endurance life is obtained by applying equivalent axle load cycle to fatigue propagation life of the steel deck plate. In this paper, the estimated endurance life is obtained by applying the estimated volume of passing vehicles to fatigue crack propagation life of steel deck plate. The major findings in this study can be summarized as follows: 1) The damage of deck plate in superannuated bridges is mostly caused by crack. Such damage is brought out by numerous passing vehicles and overweight vehicles. 2) Curves of axle load of the volume of traffic shows a pair of peaks which resembles two-mountain figures, This means that loaded vehicles pass together with empty vehicles in case of heavy vehicles. 3) Axle load vehicles under 6.9t do not affect the equivalent axle load cycle, which is good enough to ignore the estimation of endurance life of the steel deck plate in bridge. 4) Considering the number of future passing vehicles, the crack propagation life of steel deck plate, if the design life of a bridge is 100 years, is proved to have sufficient the endurance life. 5) The fatigue life of such a heavy steel structure as a long span bridge is evaluated by crack initiation life, failure life, and crack propagation life, but steel deck plate is strong enough for passing vehicle load cycle even if only fatigue propagation life is calculated.
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高南鎬 東亞大學校 海洋資源硏究所 1993 硏究論文集 Vol.6 No.1
In this study, torsional constant, shear stress and twist ratio are formularized from the theory of thin-walled box girder section in elevated bridges. The shear stress is examined to upper flange and lower flange and web in box girder section with projection part, and also is examined torsional resisting shear stress and twist ratio when opened rib and closed trough rib are attached as stiffness member for the deck plate of box girder section. The results obtained from this study are summarized as follows: When projection flange part is attached to box girder section, resisting force for torsional moment is almost at burden on box girder section and resisting force for torsional moment can be disregarded in projection flange part. The torsional constant increased almost linearly when the width of box girder is constant and its height is increased. And it is also proved that when the rate of height to width is increased in box girder, the shear stress is decreased rapidly in upper flange and lower flange and web of box girder. The shear stress and twist ratio in box girder with projection flange show almost the same value when opened rib is attached and opened rib is not attached as stiffness member of deck plate in box girder section. The shear stress of projection flange is proved to be a little decresed when closed trough rib is attached. Accordingly, there are opened and closed trough rib as stiffness member of deck plate in bridge, but considering only resisting force for torsional moment, opened rib is almost ineffective.
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