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- 검색키워드
- 저자 : Toydemir, Burak (검색결과 4 건)
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Burak Toydemir,Ali Koçak,Barış Sevim,Basak Zengin 국제구조공학회 2017 Steel and Composite Structures, An International J Vol.23 No.5
In this study, the seismic performance levels of four bridges are determined using finite element modeling based on ambient vibration testing. The study includes finite element modeling, analytical modal analyses, ambient vibration testing and earthquake analyses of the bridges. For the purpose, four prestressed precast I beam bridges that were constructed for the Ankara-Sivas high speed railway line are selected for analytical and experimental studies. In the study, firstly a literature review related to the dynamic behavior of bridges especially precast beam bridges is given and then the formulation part related to ambient vibration testing and structural performance according to Turkish Seismic Code (2007) is presented. Next, 3D finite element models of the bridge are described and modeled using LARSA 4D software, and analytical dynamic characteristics are obtained. Then ambient vibration testing conducted on the bridges under natural excitations and experimental natural frequencies are estimated. Lastly, time history analyses of the bridges under the 1999 Kocaeli, 1992 Erzincan, and 1999 Düzce Earthquakes are performed and seismic performance levels according to TSC2007 are determined. The results show that the damage on the bridges is all under the minimum damage limit which is in the minimum damage region under all three earthquakes.
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The effect of mortar type and joint thickness on mechanical properties of conventional masonry walls
Zengin, Basak,Toydemir, Burak,Ulukaya, Serhan,Oktay, Didem,Yuzer, Nabi,Kocak, Ali Techno-Press 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.67 No.6
Masonry walls are of a complex (anisotropic) structure in terms of their mechanical properties. The mechanical properties of the walls are affected by the properties of the materials used in wall construction, joint thickness and the type of masonry bond. The carried-out studies, particularly in the seismic zones, have revealed that the most of the conventional masonry walls were constructed without considering any engineering approach. Along with that, large-scale damages were detected on such structural elements after major earthquake(s), and such damages were commonly occurred at the brick-joint interfaces. The aim of this study was to investigate the effect of joint thickness and also type of mortar on the mechanical behavior of the masonry walls. For this aim, the brick masonry walls were constructed through examination of both the literature and the conventional masonry walls. In the construction process, a single-type of brick was combined with two different types of mortar: cement mortar and hydraulic lime mortar. Three different joint thicknesses were used for each mortar type; thus, a total of six masonry walls were constructed in the laboratory. The mechanical properties of brick and mortars, and also of the constructed walls were determined. As a conclusion, it can be stated that the failure mechanism of the brick masonry walls differed due to the mechanical properties of the mortars. The use of bed joint thickness not less than 20 mm is recommended in construction of conventional masonry walls in order to maintain the act of brick in conjunction with mortar under load.
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The effect of mortar type and joint thickness on mechanical properties of conventional masonry walls
Başak Zengin,Burak Toydemir,Serhan Ulukaya,Didem Oktay,Nabi Yüzer,Ali Kocak 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.67 No.6
Masonry walls are of a complex (anisotropic) structure in terms of their mechanical properties. The mechanical properties of the walls are affected by the properties of the materials used in wall construction, joint thickness and the type of masonry bond. The carried-out studies, particularly in the seismic zones, have revealed that the most of the conventional masonry walls were constructed without considering any engineering approach. Along with that, large-scale damages were detected on such structural elements after major earthquake(s), and such damages were commonly occurred at the brick-joint interfaces. The aim of this study was to investigate the effect of joint thickness and also type of mortar on the mechanical behavior of the masonry walls. For this aim, the brick masonry walls were constructed through examination of both the literature and the conventional masonry walls. In the construction process, a single-type of brick was combined with two different types of mortar: cement mortar and hydraulic lime mortar. Three different joint thicknesses were used for each mortar type; thus, a total of six masonry walls were constructed in the laboratory. The mechanical properties of brick and mortars, and also of the constructed walls were determined. As a conclusion, it can be stated that the failure mechanism of the brick masonry walls differed due to the mechanical properties of the mortars. The use of bed joint thickness not less than 20 mm is recommended in construction of conventional masonry walls in order to maintain the act of brick in conjunction with mortar under load.
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Michael Liew,Leslie R. Rowe,Phillipe Szankasi,Christian N. Paxton,Todd Kelley,Reha M. Toydemir,Mohamed E. Salama 대한진단검사의학회 2018 Annals of Laboratory Medicine Vol.38 No.6
The BCL6 gene encodes a 706-amino acid sequence-specific repressor transcription factor [1]. BCL6 has been identified as commonly rearranged in 20–40% of diffuse large B cell lymphomas (DLBCL) [2, 3]. BCL6 can be rearranged with the immunoglobulin (Ig) gene loci or non-Ig gene partners [2]. Break-apart (BAP) FISH probes are widely used for clinical testing of genes with multiple translocation partners [4]. The expected signal pattern of a rearranged sample using a BAP FISH probe is a single red and single green signal for derivative chromosomes and a single fusion signal for the normal homolog (1F/1R/1G). However, because of the complexity of genomic changes that can occur in cancer, signal patterns other than 1F/1R/1G, that is, atypical or unusual signal patterns, are also observed [5]. We describe the validation of a locus specific identifier (LSI)-BCL6 FISH assay using a digital analysis system, as well as our experience with unusual signal patterns observed using this assay. We demonstrate that unusual FISH signal patterns can be associated with copy number alterations in addition to rearrangements involving the BCL6 locus at 3q27
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