Dynamic response of masonry minarets strengthened with Fiber Reinforced Polymer (FRP) composites

Abstract

Abstract. Engineering structures strengthened with FRP composites are gaining popularity, and there is a growing need to understand and compare the behavior of these structures before/after FRP composite strengthening. In this paper, it is aimed to determine the dynamic response of masonry minarets before/after FRP composite strengthening. Anİskenderpaşa historical masonry minaret dating back to XVI century with a height of 21 m located in Trabzon, Turkey was selected as an application. Firstly, 3-D finite element model of the minaret was constituted using ANSYS software. Then, an analytical model of the minaret was analyzed using the 1992 Erzincan earthquake record, which occurred near the area, to determine the dynamic behavior. After this, the cylindrical body of the minaret was strengthened with FRP composite using different configurations and dynamic analyses were performed. Finally, dynamic responses of the minaret before and after FRP composite strengthening, such as displacements and maximum-minimum principal stresses, were compared. At the end of the study, it is seen that displacements had increased along the height of the minaret, maximum and minimum principal stresses occur at the region of transition segment and cylindrical body for all analyses. Also, it is seen from the earthquake analyses that FRP strengthening is very effective on the dynamic responses of the minaret.

- Dynamic Seismic and Wind Response of Masonry Minarets

“…Finally, in the linear time history analyses utilized in this study, linear elastic force-deformation relationships are considered. This is valid for the structural analyses of the considered minaret because it is not possible to determine the exact nonlinear behavior of the material due to reason provided by Altunisik [16] that removing test samples from the historical masonry structures such as minarets was not allowed by the related institution. Therefore, in this study, nonlinear analyses can't be performed for the structural analyses of the considered minaret.…”

“…The minaret was made in alternate style with bricks and colored stones with beautiful decorations under the balcony. Scarecrows are decorated with emblems and circular motifs [16,49].…”

“…In this study, the considered historical masonry minaret, İskenderpaşa historical minaret, is selected from technical literature as the dynamic characteristics of this minaret is obtained and verified both analytically and experimentally by Altunişik [16]. Therefore, it is only needed to compare the dynamic characteristics of the FEM model produced in this study with the ones obtained by Altunişik [16]. In order to do that several iterations were performed on the produced FEM model to closely approximate the dynamic characteristics of Altunişik [16].…”

“…Therefore, it is only needed to compare the dynamic characteristics of the FEM model produced in this study with the ones obtained by Altunişik [16]. In order to do that several iterations were performed on the produced FEM model to closely approximate the dynamic characteristics of Altunişik [16]. At the end of these iterations, the closest FEM model that represents the dynamic characteristics of the validated model by Altunişik [16] is decided to be used in dynamic analyses.…”

Dynamic response of a reinforced concrete minaret

“…In the study, dynamic responses of the minaret before and after FRP composite strengthening, such as displacements and maximum-minimum principal stresses, were compared. Bayraktar et al [11,12] studied about the historical masonry minaret, its finite element modeling, modal testing, finite element model calibration and seismic response. Modal analysis is performed on the developed 3D finite element model of the minaret to obtain the analytical frequencies and mode shapes.…”