000021737 001__ 21737
000021737 005__ 20170622131302.0
000021737 04107 $$aeng
000021737 046__ $$k2017-06-15
000021737 100__ $$aKaewunruen, Sakdirat
000021737 24500 $$aDYNAMIC RESPONSES OF RAILWAY ULTRA-HIGH-STRENGTH CONCRETE SLEEPERS UNDER EXTREME IMPACT LOADING

000021737 24630 $$n6.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000021737 260__ $$bNational Technical University of Athens, 2017
000021737 506__ $$arestricted
000021737 520__ $$2eng$$aUltra high strength concrete has been adopted recently in construction industry. Prestressed concrete sleepers (or railroad ties) are designed usually using high strength concrete (around 50-80 MPa) in order to carry and transfer the wheel loads from the rails to the ground and to maintain rail guage for safe train travels. The sleepers are installed as the crosstie beam support in railway track systems. They are subjected to impact loading conditions that are resulted from train operations over wheel or rail abnormalities, such as flat wheels, dipped rails, crossing transfers, rail squats, corrugation, etc. The magnitude of the shock load relies on various factors such as axle load, types of wheel/rail imperfections, speeds of vehicle, track stiffness, etc. This paper demonstrates the development of finite element modelling to investigate the dynamic responses of prestressed concrete sleepers using ultra high strength materials (over 100 MPa), particularly under a variety of impact loads. The 3D finite element model of prestressed concrete sleeper has been developed using a finite element package, LS-Dyna. It has been verified by the experiments carried out using the high capacity drop-weight impact machine at the University of Wollongong, Australia. The experimental results provide very good correlation with numerical simulations. In this paper, the numerical studies are extended to evaluate the dynamic behaviors of high strength steel wires and ultra high strength concrete; as well as their nonlinear responses under different parameters. The outcome of this study can potentially lead to the utilization and design guideline of ultra high strength concrete for prestressed concrete sleepers.

000021737 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000021737 653__ $$aRailway, Concrete Sleepers, Railroad Ties, Prestressing Tendons/Wires, Impact Analysis, Dynamic Responses, High Strength Concrete, Ultra High Performance, LS-Dyna.

000021737 7112_ $$aCOMPDYN 2017 - 6th International Thematic Conference$$cRhodes Island (GR)$$d2017-06-15 / 2017-06-17$$gCOMPDYN2017
000021737 720__ $$aKaewunruen, Sakdirat$$iMinoura, Shintaro$$iRemennikov, Alex
000021737 8560_ $$ffischerc@itam.cas.cz
000021737 8564_ $$s653968$$uhttps://invenio.itam.cas.cz/record/21737/files/17732.pdf$$yOriginal version of the author's contribution as presented on CD, section: [MS32] Extreme Dynamics
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000021737 962__ $$r21500
000021737 980__ $$aPAPER