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RISS 인기검색어
- 검색키워드
- 저자 : Karoumi (검색결과 4 건)
- 무료
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Guo, Weiwei,Xia, He,Karoumi, Raid,Zhang, Tian,Li, Xiaozhen Techno-Press 2015 Wind and Structures, An International Journal (WAS Vol.20 No.2
For high-speed railways (HSR) in wind prone regions, wind barriers are often installed on bridges to ensure the running safety of trains. This paper analyzes the effect of wind barriers on the running safety of a high-speed train to cross winds when it passes on a bridge. Two simply-supported (S-S) PC bridges in China, one with 32 m box beams and the other with 16 m trough beams, are selected to perform the dynamic analyses. The bridges are modeled by 3-D finite elements and each vehicle in a train by a multi-rigid-body system connected with suspension springs and dashpots. The wind excitations on the train vehicles and the bridges are numerically simulated, using the static tri-component coefficients obtained from a wind tunnel test, taking into account the effects of wind barriers, train speed and the spatial correlation with wind forces on the deck. The whole histories of a train passing over the two bridges under strong cross winds are simulated and compared, considering variations of wind velocities, train speeds and without or with wind barriers. The threshold curves of wind velocity for train running safety on the two bridges are compared, from which the windbreak effect of the wind barrier are evaluated, based on which a beam structure with better performance is recommended.
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FEM simulation of a full-scale loading-to-failure test of a corrugated steel culvert
Amer Wadi,Lars Pettersson,Raid Karoumi 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.27 No.2
This paper utilizes 3D FEM to provide deeper insights about the structural behaviour of a 6.1 m span steel culvert, which was previously tested under extreme loading. The effect of different input parameters pertaining to the backfill soil has been investigated, where the structural response is compared to field measurements. The interface choice between the steel and soil materials was also studied. The results enabled to realize the major influence of the friction angle on the load effects. Moreover, the analyses showed some differences concerning the estimation of failure load, whereas reasons beyond this outcome were arguably presented and discussed.
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Weiwei Guo,He Xia,Raid Karoumi,Tian Zhang,Xiaozhen Li 한국풍공학회 2015 Wind and Structures, An International Journal (WAS Vol.20 No.2
For high-speed railways (HSR) in wind prone regions, wind barriers are often installed onbridges to ensure the running safety of trains. This paper analyzes the effect of wind barriers on the runningsafety of a high-speed train to cross winds when it passes on a bridge. Two simply-supported (S-S) PCbridges in China, one with 32 m box beams and the other with 16 m trough beams, are selected to performthe dynamic analyses. The bridges are modeled by 3-D finite elements and each vehicle in a train by amulti-rigid-body system connected with suspension springs and dashpots. The wind excitations on the trainvehicles and the bridges are numerically simulated, using the static tri-component coefficients obtained froma wind tunnel test, taking into account the effects of wind barriers, train speed and the spatial correlationwith wind forces on the deck. The whole histories of a train passing over the two bridges under strong crosswinds are simulated and compared, considering variations of wind velocities, train speeds and without orwith wind barriers. The threshold curves of wind velocity for train running safety on the two bridges arecompared, from which the windbreak effect of the wind barrier are evaluated, based on which a beamstructure with better performance is recommended.
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Overview of Steel Bridges Containing High Strength Steel
Oskar Skoglund,John Leander,Raid Karoumi 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.4
The use of high strength steel has the potential to reduce the amount of steel used in bridges and thereby, facilitate a more sustainable construction. A survey of existing bridges built using high strength steel is presented in this paper with emphasis on the Swedish bridge stock. The survey aimed at identifying the steel grades that were used and where in the cross-section they have been used. A case study on the infl uence of fatigue shows that today’s regulations make it more diffi cult to use high strength steel in comparison to previous regulations.
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