Investigation of Dynamic Railway Forces with Impact Simulations

Öz

Within the scope of this study, the characteristics of static, semi-static, and dynamic forces occurring in railways were investigated. For this purpose, an extensive literature review, simplified examples, and unique impact simulations were used. During the simulations, B70 type prestressed concrete railway sleepers were used and the effect of different interfaces was demonstrated. So, in accordance with the risk control hierarchy; attention has been drawn to how the dynamic forces can be restricted in the first place. In addition, while designing railway structural elements, it is aimed to increase the level of perceptual awareness of how the right design philosophy should be. As a result of the study, it was concluded that railway structural elements with low elasticity modulus and stiffness at an optimum level and high deformation ability can reduce the magnitude and frequency components of the forces acting on themselves and spreading to the environment.

Anahtar Kelimeler

• Railway loads
• impact test
• dynamic force
• frequency based design

Dinamik Demiryolu Kuvvetlerinin Darbe Simülasyonlarıyla İncelenmesi

Öz

Bu çalışma kapsamında, demiryollarında meydana gelen statik, yarı-statik ve dinamik kuvvetlerin karakteristik özellikleri, geniş bir literatür taraması, basitleştirilmiş örneklendirmeler ve özgün darbe simülasyonları ile incelenmiştir. Simülasyon çalışmaları esnasında, B70 tipi öngerilmeli beton demiryolu traversleri kullanılmış ve farklı ara yüzeylere yüksekten serbest kütle düşüşleri gerçekleştirilmiştir. Bu sayede dinamik kuvvetlerin, risk kontrol hiyerarşisine uygun olarak; ilk etapta nasıl kısıtlanabileceği ve demiryolu yapı elemanları dizayn edilirken, doğru dizayn felsefesinin nasıl olması gerektiği yönünde algısal farkındalık düzeyinin artırılması hedeflenmiştir. Çalışma sonucunda, elastisite modülü ve rijitliği optimum düzeyde düşük ve deformasyon kabiliyeti yeterli derecede yüksek demiryolu yapı elemanlarının hem kendisine etkiyen hem de çevreye yayılan kuvvetlerin ivme değerlerinin şiddet ve frekans bileşenlerini düşürmeyi sağladığı, deneysel olarak ortaya konulmuştur.

Anahtar Kelimeler

• Demiryolu yükleri
• darbe testi
• dinamik kuvvet
• frekans bazlı tasarım

Teşekkür

Bu çalışmadaki katkılarından dolayı Sakarya Üniversitesi Araştırma Görevlileri M. Burhan NAVDAR ve İrfan Ş. ÖZTÜRK’e, ayrıca TÜBİTAK ARDEB ve BİDEB Dairesi Başkanlıklarına teşekkürlerimizi bildiririz.

Kaynakça

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