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    Experimental investigation and pseudoelastic truss model for in-plane behavior of corrugated sandwich panels with polyurethane foam core
    (Elsevier Science Inc, 2021) Yüksel, Ercan; Güllü, Ahmet; Özkaynak, Hasan; Soydan, Cihan; Khajehdehi, Arastoo; Şenol, Erkan; Saghayesh, Amir Mahdi; Saruhan, Hakan
    Sandwich panels are commonly used in facades and the roofs of industrial buildings due to their well-known advantages. However, there is limited data about the in-plane behavior of the panels. Hence, this paper aimed to propose a pseudoelastic truss model to represent the effective in-plane stiffness and strength properties of the corrugated sandwich panels with a polyurethane foam core. Two separate sets of experiments (mock-up and system test) were conducted in the laboratory. The variables were the number of fasteners, sheet thickness, loading direction, and number of ribs. The number of fasteners, sheet thickness, and loading direction are the most effective parameters for the in-plane behavior. A formula was proposed to compute axial stiffness of the truss members by considering the effective parameters. Experimental results showed that the proposed robust truss model could give a good estimate of the pseudoelastic stiffness and maximum load bearing capacity of the sandwich panels.
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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.