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    Experimental investigation on the performance of rail fastening systems
    (Avestia Publishing, 2021) Toprak, Mehmet Ali; Çalım, Furkan; Gönülcü, Emre; Şahin, M. Fatih; Güllü, Ahmet; Durgun, Yavuz; Saruhan, Hakan; Yüksel, Ercan
    One of the essential concerns in railway systems is the lifetime of rail tracks. The safety of rail fastening systems plays a significant role in rail track longevity. A standardized laboratory test procedure is required to be followed to evaluate the performance of rail fastening systems on the European railways according to EN 13146 standard series. In this study, longitudinal rail restraints and pull-out resistances were experimentally determined following EN 13146-1 and EN 13146-10, respectively. Two different types of prestressed concrete sleepers (namely B320 type and B70 type) having the same concrete quality, design axle load, and design speed but different dimensions and fastening systems were used in the experimental studies. All specimens used in this study were seen to satisfy the conditions given in the standards. It was also observed that the fastening system used in B320 type prestressed concrete sleepers results in slightly higher axial load and pull-out load capacities.
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    Rapid and easily applicable procedure for full-scale laboratory tests of ballastless slab tracks
    (ASCE-American Society of Civil Engineers, 2021) Güllü, Ahmet; Özden, Bayezid; Ölçer, Beyazıt; Özcan, Ali İhsan; Binbir, Ergün; Durgun, Yavuz; Saruhan, Hakan; Şahin, Fatih; Şenol, Erkan; Khajehdehi, Arastoo; Noobakhtjoo, Amir; Yüksel, Ercan
    Increasing demand for high speed railway lines necessitates reducing construction and maintenance costs. Accordingly, RC slab tracks are preferred due to their advantages such as being almost maintenance free and supplying uniform support conditions. However, new testing procedures are required for the performance evaluation of the slab tracks to identify possible failure modes which may not be observed in numerical analyses. Although there are some procedures in the literature, there still is no consensus on loading intensity, shape, frequency, or number of cycles. A testing procedure that greatly decreases experimental costs was adopted for the design approval tests of precast RC slab tracks. The procedure was evaluated experimentally through full-scale laboratory tests of intact and intentionally damaged specimens. The study demonstrated that the proposed testing procedure reduces experimental costs and identifies the mechanical properties of slab tracks.
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    Z-type shear connector for interface of hollow-core slab and cast-in-place topping concrete
    (Elsevier Science Ltd, 2020) Yüksel, Ercan; Güllü, Ahmet; Durgun, Yavuz; Binbir, Ergün; Şenol, Erkan; Khajehdehi, Arastoo; Saruhan, Hakan
    Precast hollow-core slabs (PHSs) are widely used in precast construction due to their relatively low dead weight and easy assemblage. Cast-in-place topping concrete (TC) is utilized to obtain composite sections and to enhance in-plane stiffness of the slab system. Shear transfer between the layers of a composite slab can be provided by the upper face roughness of PHS. However, the roughening process may not be preferred in some plants. This paper evaluates the efficiency of Z-type shear connectors applied in the interface between PHS and TC. Three dissimilar interface conditions (i.e., Z-reinforced, smooth and rough) were studied experimentally in full-scale specimens. Push-off loading was applied to evaluate the interface shear transfer capability of the specimens, and Z-type shear connectors were found to be the most effective when they are applied at each joint between PHSs. The achievements of some code equations to assess interface shear strength were also investigated, and an alteration for the interface shear capacity equation of ACI 318M is proposed.