Browsing by Author "Yucel, G"

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    Experimental out-of-plane damage limits of historical stone masonry walls
    Misir, IS; Yucel, G; Kuran, F; Eser, CB; Aldemir, O; Topcu, S
    In stone masonry buildings, failure under strong ground motions usually occurs in the form of out-of-plane overturning of the walls before reaching their in-plane strength, as the walls have long unsupported spans perpendicular to their plane and the lack of slabs ensuring a diaphragm effect. Post-earthquake damage obser-vations reveal this specific weakness of the historic masonry walls. Experimental determination of the out-of -plane damage limits of these walls, emerges as a need for use, especially during numerical evaluations. This article presents the results of static and dynamic testing of double-and three-leaf large-scale U-shaped masonry wall specimens. For this purpose, nondestructive material characterization was conducted on a reference his-torical masonry structure. Large-scale wall specimens were designed considering these findings and material tests performed on mortar samples. Quasi-static cyclic tests and ambient vibration tests for both initial and damaged conditions were performed on these specimens to capture the damage evolution and the corresponding drift limits. Damage limits are suggested to be used in performance-based evaluations of other territorial structures.
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    A multicenter nationwide reference intervals study for common biochemical analytes in Turkey using Abbott analyzers
    Ozarda, Y; Ichihara, K; Aslan, D; Aybek, H; Ari, Z; Taneli, F; Coker, C; Akan, P; Sisman, AR; Bahceci, O; Sezgin, N; Demir, M; Yucel, G; Akbas, H; Ozdem, S; Polat, G; Erbagci, AB; Orkmez, M; Mete, N; Evliyaoglu, O; Kiyici, A; Vatansev, H; Ozturk, B; Yucel, D; Kayaalp, D; Dogan, K; Pinar, A; Gurbilek, M; Cetinkaya, CD; Akin, O; Serdar, M; Kurt, I; Erdinc, S; Kadicesme, O; Ilhan, N; Atali, DS; Bakan, E; Polat, H; Noyan, T; Can, M; Bedir, A; Okuyucu, A; Deger, O; Agac, S; Ademoglu, E; Kaya, A; Nogay, T; Eren, N; Dirican, M; Tuncer, G; Aykus, M; Gunes, Y; Ozmen, SU; Kawano, R; Tezcan, S; Demirpence, O; Degirmen, E
    Background: A nationwide multicenter study was organized to establish reference intervals (RIs) in the Turkish population for 25 commonly tested biochemical analytes and to explore sources of variation in reference values, including regionality. Methods: Blood samples were collected nationwide in 28 laboratories from the seven regions (>= 400 samples/region, 3066 in all). The sera were collectively analyzed in Uludag University in Bursa using Abbott reagents and analyzer. Reference materials were used for standardization of test results. After secondary exclusion using the latent abnormal values exclusion method, RIs were derived by a parametric method employing the modified Box-Cox formula and compared with the RIs by the non-parametric method. Three-level nested ANOVA was used to evaluate variations among sexes, ages and regions. Associations between test results and age, body mass index (BMI) and region were determined by multiple regression analysis (MRA). Results: By ANOVA, differences of reference values among seven regions were significant in none of the 25 analytes. Significant sex-related and age-related differences were observed for 10 and seven analytes, respectively. MRA revealed BMI-related changes in results for uric acid, glucose, triglycerides, high-density lipoprotein (HDL)-cholesterol, alanine aminotransferase, and.-glutamyltransferase. Their RIs were thus derived by applying stricter criteria excluding individuals with BMI >28 kg/m(2). Ranges of RIs by non-parametric method were wider than those by parametric method especially for those analytes affected by BMI. Conclusions: With the lack of regional differences and the well-standardized status of test results, the RIs derived from this nationwide study can be used for the entire Turkish population.