Browsing by Author "Eser, CB"

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    Damping impact with different water level on structural behaviour of elevated water towers
    Altiok, TY; Yigit, ME; Eser, CB; Demir, A
    Water towers with tall and delicate geometry are highly susceptible to seismic actions. This study aims to develop a fast, reliable and cost-effective method for examining the seismic behaviour of such structures, by taking a reinforced concrete water tower with known material parameters and dimensions as an example. The impact of water absorption on structural response under dynamic loading at empty, half full and full capacity was investigated. Ideal finite element models of the water tower were constructed using operational modal analysis. Linear time history analyses were conducted using the finite element software. The structure was modelled with the Lagrangian approach, while the fluid was modelled using the Eulerian approach in finite element analysis. The coupled Eulerian Lagrangian technique was employed for the analysis. Results obtained from the analyses indicate that an increase in tank fill level led to enhanced structural damping, resulting in reduced displacement and stress values.
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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.