Browsing by Author "Dere, Yunus"

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Ambient Vibration Analysis of an Industrial Building
(2021) Kartal, Hüseyin; Dere, Yunus; Arslan, Musa Hakan
Due to the heavy and dynamic equipment, the vibration and resonance effects that are not encountered under static dead loading may amplify over time in industrial buildings. This might cause damage to the structural system and create human comfort problems while the structure is in service. In this study, ambient vibration testing of a building composed of reinforced concrete and steel structural systems and located at a boron processing plant in Turkey was performed. The velocities and accelerations caused by the sieve shaker system attached to the structure with springs, are evaluated under the effect of sample loading.
Failure Analysis of a Base Support Plate of a Semolina Purifier Machines Subjected To Fatigue Loading
(2024) Korkmaz, Hasan Hüsnü; Dere, Yunus; Ekem, Hakkı; Şahin, Ömer Sinan
The semolina purifier is a machine used in the production phase in flour factories and is exposed to fatigue loads. In this study, the reason for the damage when a semolina purifier machine breaks during use and the improvements that need to be made in the design are discussed. For this purpose, a finite element model (FEM) was created using ABAQUS software. As a result of the analysis, it was determined that the design of the machine support platform should be improved. A two-stage strengthening alternative is designed. The cyclic loads applied by the twin motors that move the machine screens are applied in the FEM model. The deformations and stresses occurring in the reinforced and existing design machine base plate were compared. The results showed that, the maximum equivalent stress level can be reduced from 86 MPa to 35 MPa by design improvements made on the base plate.
Citation - WoS: 1
Citation - Scopus: 1
Investigation of Plastic Hinge Length in High-Ductility Reinforced Concrete Shear Walls
(Pontificia Univ Catolica Chile, Escuela Construccion Civil, 2024) Tulen, Hacer; Dere, Yunus; Arslan, Musa Hakan
In this study, the plastic hinge lengths of reinforced concrete (R/C) cantilever shear walls were analytically determined considering various design parameters. Nonlinear static (Pushover) analyses were conducted on R/C shear wall models and their nonlinear behavior was examined using ABAQUS software. In the study, 72 shear wall models with different parameters were analyzed under the influence of vertical and horizontal loads. Parameters whose effects on plastic hinge length were investigated height/length ratio (Hw/Lw), axial load ratio (N/No), and horizontal web reinforcement ratio (rho sh). The load-displacement graphs of the modelled shear walls were obtained. The plastic hinge height of shear walls was determined according to the heights of the deformations in the concrete and longitudinal steel reinforcement in the section when the shear walls lateral load decreased by 15%. The analytical plastic hinge lengths (Lpz) were determined with respect to the location of the yield occurred at the longitudinal steel reinforcement of the shear wall. The observed plastic hinge lengths (Lp) were determined based on the height of observed the crush as of the foundation top level in the concrete shear wall model. The relationship between the findings of this study and empirical formulas in the literature was determined. It was determined that there is greater closeness between the values obtained from empirical formulas in the literature and the observed plastic hinge length values. It was observed that the plastic hinge length generally increases as the shear span increases. It was observed that the change in rho sh was not a very effective parameter in plastic hinge formation. As the N/No decreases, the plastic hinge length values generally increase. The Lp/Lpz ratio varied within the range of 0.150.50. In addition to ductility (mu) values were determined by using the displacements determined according to both the crushing occurred in the shear wall concrete and the yield observed in the steel reinforcement. The observed that the ductility value depends more on Hw/Lw ratio as N/No ratio decreases.