Yazar "Bagbanci, Muhammed Bilal" seçeneğine göre listele

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    Linear/Nonlinear Dynamic Analysis and Prediction of Failure Mechanism of Irgandi Bridge
    (Budapest Univ Technology Economics, 2022) Sakcali, Gokhan Baris; Gonul, Alper; Bagbanci, Muhammed Bilal; Yuksel, Isa
    The goal of this study is to investigate the behavior and failure mechanism of historical Irgandi Bridge located in Bursa City under earthquake loads by using linear and nonlinear dynamic analysis. Dynamic characteristics of the bridge is investigated by using in-situ Operational Modal Analysis (OMA) tests. The finite element model is updated according to the OMA tests. Three different artificial earthquake records from weak to very strong are applied to the model for understanding the damage zones and the failure mechanism of the historical bridge. The results show that the bridge does not reach the failure mechanism under weak earthquakes for nonlinear dynamic analysis. However, under strong earthquake even if damage zones are occurred and the stiffness of the bridge is decreased, there is no failure mechanism observed according to the nonlinear dynamic analyses. Under very strong earthquake loads the bridge reaches the failure mechanism according to the nonlinear dynamic analysis. As the earthquake level increases, the difference between linear and nonlinear dynamic analysis results increases due to structural damages. In addition, considering the soil-structure interactions, it is concluded that the dynamic characteristics could be reflected more accurately.
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    Seismic performance of Nilüfer Hatun Bridge pre- and post-restoration under near-fault and far-fault ground motions
    (Pergamon-Elsevier Science Ltd, 2025) Sakcal, Gokhan Baris; Bagbanci, Muhammed Bilal; Ozturk, Yusuf; Cevahir, Cigdem Merit
    This study investigates the seismic performance of the Nil & uuml;fer Hatun Bridge, a historical structure in Bursa, T & uuml;rkiye, both before and after its restoration under near-fault and far-fault ground motions. Using finite element analysis (FEA), this study evaluates the bridge's dynamic characteristics, structural behavior, and damage mechanisms. Originally built during the Byzantine period with seven arches, the bridge was later reconstructed during the Ottoman period after sections were destroyed, restoring its original configuration. The modal analysis revealed significant changes in fundamental frequencies and mode shapes due to restoration, which affected the seismic response of the structure. Nonlinear dynamic analyses showed that near-fault ground motions induce larger base shear forces, greater displacements, and more concentrated damage at the piers and arches than far-fault motions, which generate resonance effects. In addition, the pre-restoration bridge exhibited higher cumulative hysteretic energy dissipation. This study offers valuable insights into the seismic resilience of historical masonry bridges, emphasizing the impact of restoration on seismic performance and providing critical information for the development of effective conservation and assessment strategies.