ABSTRACT
In this study, assessment of the two towers of Seddülbahir Fortress are realized by means of linear structural analysis. Dynamic identification is performed for modal updating of structural system which helps to develop intervention proposals. Seddülbahir Fortress is a unique defensive structure of Canakkale Bosphorus which was constructed in the era of Sultan the IV Murat by his mother Hatice Turhan Sultan in 1658. The structure was damaged during Canakkale War and exposed to weathering effects by now. Deteriorations and conscious human harm by replacing the stones are observed. Therefore, the structural integrity of the towers is lost due to the collapse of the domes of the towers and the body walls as well by half. In order to assess the earthquake risk, finite element models were conducted by using 2D and 3D laser scanning survey data. In FEM models, homogeneous and elastic material properties are taken in to account. Dynamic properties of the structures are evaluated by using acceleration data under ambient vibration. Natural frequency and modal shapes obtained by dynamic tests are used to check the consistency of the FEM models constructed with estimations and required modifications are done to match the behavior. In addition to linear elastic analysis results, possible damage mechanisms are studied to estimate damage activation acceleration values which can cause loss of equilibrium. Consequently, structural interventions are proposed by considering different assessment approaches.
