Comparative Investigation of Carbon-Fiber Laminate Reinforced Sleepers with B70-Type Prestressed Concrete Sleepers

Öz

In this study, the center negative bending performance of concrete sleepers reinforced with domestic carbon fiber reinforced polyurethane laminates is investigated by comparative experiments with prestressed B70 type concrete sleepers. According to the test results, the fatigue-based design load of the new type of sleepers is two times higher than the B70 type prestressed sleepers. In addition, although no prestressing force or stirrups are used in the new type of sleepers, the crack widths that occur are still below 0.05 mm, even at the load values above the breaking load of the B70 type prestressed sleepers. These advantages are significant to prevent derailment and accidents by protecting rail gauge openings and increasing the service life of the sleeper.

Anahtar Kelimeler

• Carbon fiber reinforced polyurethane
• CFRP
• concrete sleeper
• LCR type sleeper
• LUR cycle

Proje Numarası

120M403/2020

Karbon-Fiber Plaka Donatılı Traverslerin, B70-Tipi Öngerilmeli Beton Traverslerle Karşılaştırmalı İncelenmesi

Öz

Bu çalışma kapsamında, yerli karbon fiber takviyeli poliüretan plakalar ile donatılandırılmış beton traverslerin merkez negatif eğilme performansı, öngerilmeli B70 tipi traverslerle karşılaştırmalı yürütülen deneyler ile araştırılmıştır. Yapılan testler sonucunda, yeni tip traverslerin yorulma esaslı dizayn yükünün, B70 tipi öngerilmeli traverslerin 2 katına ulaşan oranda daha yüksek sonuçlandığı görülmüştür. Ayrıca yeni tip traverslerde herhangi bir öngerilme kuvveti veya etriye kullanılmamasına rağmen, B70 tipi öngerilmeli traverslerin kırılma yükünün üzerindeki yük değerlerinde dahi, meydana gelen çatlak genişliklerinin halen 0,05 mm’nin altında kaldığı görülmüştür. Bu avantajlar, raylı sistemlerde ekartman açıklıklarının korunarak deray ve kazaların önlenmesi ve travers servis ömrünün artırılması adına oldukça önemlidir.

Anahtar Kelimeler

• Karbon fiber takviyeli poliüretan
• CFRP
• beton travers
• LCR tipi travers
• YKY çevrimi

Destekleyen Kurum

Tübitak Ardeb Dairesi Başkanlığı

Proje Numarası

120M403/2020

Teşekkür

Bu çalışma, Tübitak Ardeb Dairesi Başkanlığı’nın 120M403/2020 sayılı projesi kapsamında desteklenmektedir. Ayrıca katkılarından dolayı TCDD Sivas Beton Travers Fabrikası Müdürü Sn. Ali KARABEY’e ve dowAksa® firması yetkilisi Sn. Ilgaz DOĞAN’a teşekkürlerimizi bildiririz.

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