Finite element analysis of railway slab trackstructure
Başlık çevirisi mevcut değil.
- Tez No: 718341
- Danışmanlar: Belirtilmemiş.
- Tez Türü: Yüksek Lisans
- Konular: Ulaşım, Transportation
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2020
- Dil: İngilizce
- Üniversite: The University of Nottingham
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 65
Özet
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Özet (Çeviri)
With the increasing travel demand in the world, it is aimed to shorten travel times and to develop faster transportation preferences. One of them is highspeed train projects. Conventional infrastructure systems have begun to not respond to the increase in train speeds in railways, and innovative approaches, the leading of which were slab track designs, have been started to be developed. Since the behaviour of slab track structures are different from conventional ballast railways, new model techniques have been developed, and their behaviour under moving loads has been studied. In this thesis, firstly, 3D finite element model of slab track is created by using ABAQUS software. Further, tools are developed in Excel to investigate the dynamic behaviours under slab track, which is utilized the input of ABAQUS software. Twelve models is developed to examine the effect of material properties used in slab track designs on its behaviour and the responses of all layers under static loading is analyzed. Besides, the effect of train speeds on slab tack behaviour is also evaluated by combining with static analysis data. The results show that the choice of stiff railpad has a significant positive effect on displacement; however, it causes more acceleration of the slab layer. Elastics modulus of soil under the slab layer is a governing factor for vibration frequency, vertical displacement, horizontal stress in the model used concrete sub-slab and vertical stress in the model used asphalt slab. On the other hand, it is generally not crucial for change in the acceleration of layers. Apart from the classical slab track designs, It has been observed that the choice of asphalt material in the sub-slab does not cause any adverse consequence in many parameters examined, which are displacement, acceleration of the layers, stress and vibration. Although the use of asphalt in the lower slab layer causes a limited increase in vertical displacement and vertical stress, there is a moderate decrease in vibration frequency and longitudinal stress values. When regarding the acceleration values, close results are found in the concrete sub-slab.
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