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      저자 : Seyed-Ali Mosayebi (검색결과 2 건)
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      • KCI등재

        Field test investigation and numerical analysis of ballasted track under moving locomotive

        Seyed-Ali Mosayebi,Jabbar Ali Zakeri,Morteza Esmaeili 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.3

        This paper is devoted to investigating of dynamic behavior of a ballasted railway track by field tests and numerical analyses. In this regard, at first in a field test program, two different sections in a ballasted track including concrete and wooden sleepers with good quality are selected and their dynamic vertical deflections are measured due to moving locomotive. In continuation, the numerical model of vehicle track interaction is developed and its results are verified using the measured values in the field tests and the previous research studies. Finally, using the verified model, a series of sensitivity analyses are accomplished on effecting parameters including sleeper type and track modulus. Results indicate that the dynamic behavior of the ballasted track under moving locomotive is linear with concrete sleepers while non-linear with wooden sleepers.

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        Vehicle/track dynamic interaction considering developed railway substructure models

        Seyed-Ali Mosayebi,Jabbar-Ali Zakeri,Morteza Esmaeili 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.61 No.6

        This study is devoted to developing many new substructure models for ballasted railway track by using the pyramid model philosophy. As the effect of railway embankment has been less considered in the previous studies in the field of vehicle/track interaction, so the present study develops the pyramid models in the presence of railway embankment and implements them in vehicle/track interaction dynamic analyses. Considering a moving car body as multi bodies with 10 degrees of freedom and the ballasted track including rail, sleeper, ballast, subgrade and embankment, two categories of numerical analyses are performed by considering the new substructure systems including type A (initiation of stress overlap areas in adjacent sleepers from the ballast layer) or type B (initiation of stress overlap areas in adjacent sleepers from the subgrade layer). A comprehensive sensitivity analyses are performed on effective parameters such as ballast height, sleepers spacing and sleeper width. The results indicate that the stiffness of subgrade, embankment and foundation increased by increasing the ballast height. Also, by increasing the ballast height, rail and ballast vertical displacement decreased.

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