Browsing by Author "Celik, Ozan Cem"

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    Processing forced vibration test records of structural systems using the analytic signal
    (2020) Celik, Ozan Cem; Gulkan, Hakki Polat
    This article presents the use of the analytic signal procedure for processing the large volume of structural vibration data recorded in forced vibration tests. The analytic signal facilitates the computationally laborious task of extracting the steady-state amplitude for each response measure of interest from the recorded accelerations throughout the building at each operated frequency of the forced vibration source. The implementation of the signal processing procedure introduced here is illustrated in deriving the acceleration-frequency response curves from the forced vibration test of the first permanently instrumented building in Turkey. This reinforced concrete building, subsequently strengthened with cast-in-place reinforced concrete infill shear walls, is located in close proximity to the North Anatolian Fault. Later, system identification of the building yields the in situ structural system dynamic properties for the first translational and torsional vibration modes, which are compared with those identified from the ambient vibrations of the building recorded following its forced vibration test. The analytic signal procedure is a convenient tool for the rapid and correct derivation for mode shapes and associated frequencies and damping ratios from forced vibration testing of structural systems.
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    System Identification for A Six-Storey Precast Concrete Frame Building
    (2021) Celik, Ozan Cem; Gulkan, H. Polat
    This paper presents forced and ambient vibration tests on a six-storey precast concrete frame building, a structural system that has not often been the focus of such tests in spite of its widespread use. Precast buildings come with semi-rigid connections so their idealisation requires good knowledge of the construction practice for those connections and their details. Structural system dynamic properties are identified for the first three translational modes along each axis of the building and for the first three torsional modes. The study shows that the three-dimensional finite-element structural model for the building is capable of replicating the measured in situ dynamic properties. In the small displacement elastic range, the finite-element modelling of precast concrete frame systems is not very different from their cast-in-place counterparts but an extrapolation to the large displacement range requires empirical confirmation.