Journal of Structural Engineering & Applied Mechanics - Golden Light Publishing ® | Trabzon

Journal of Structural Engineering & Applied Mechanics

ARTICLES

Esin Ertürk Batuhan Aykanat Ahmet Can Altunışık Mehmet Emin Arslan

On November 23, 2022, at 04:08 local time, the Gölyaka district of Düzce, which is located in the west of the Black Sea Region of Turkey, struck an earthquake with a magnitude of Mw = 5.9. A total of 181 reinforced and masonry buildings were severely damaged due to the earthquake and it is reported that need to be demolished urgently throughout the province of Düzce. In this study, the seismological characteristics and recorded ground motion accelerograms of the earthquake are evaluated. The case studies of damaged reinforced concrete and masonry buildings because of the earthquake are also investigated. The factors that cause the buildings to be damaged during the earthquake are evaluated based on site observations.

https://doi.org/10.31462/jseam.2022.04197221


Kemal Hacıefendioğlu Hasan Basri Başağa

The present work aims toward the effect of uncertain structural parameters on the stochastic dynamic response of an asphaltic lining dam-foundation system subjected to stationary as well as non-stationary random excitation. Uncertain structural parameters of interest are shear modulus and mass density, modeled using the lognormal distribution. The stochastic seismic response of the dam-foundation system to the random loads with uncertain structural parameters is carried out with the Monte Carlo simulation method. The spatial variability of ground motion is considered with incoherence and wave passage effects as stationary as well as non-stationary random excitation. A time-dependent frequency response function is used throughout the study for non-stationary responses. Obtained results indicate that the variability of shear modulus and mass density can be neglected in stochastic dynamic analysis of an asphaltic lining dam-foundation system. Also, it is seen from the results that stationarity is a reasonable assumption for asphaltic lining dams to typical durations of strong shaking.

https://doi.org/10.31462/jseam.2022.04222237


Kagan Sogut

This study presents a two-dimensional nonlinear finite element (FE) model for Deep Embedment (DE) strengthened reinforced concrete (RC) beams without existing steel shear links. The FE model was developed and validated against experimental results reported in published literature. The parametric study was thereafter conducted to examine important parameters influencing the strengthened behavior. The parameters were concrete compressive strength, beam width, beam size, and tension reinforcement ratio. The FE model accurately predicted experimental results with a mean predicted-to-experimental value of 1.04. The FE results showed that the percentage of shear strength provided by embedded steel bars was almost constant once both concrete strength and tension reinforcement ratio were increased. However, an increase in the beam width resulted in a decrease in the percentage of shear strength gain due to embedded steel bars. Shear stress at failure decreased once beam size was increased for both unstrengthened (control) and DE-strengthened beams. The percentage of shear strength provided by embedded steel bars decreased from 47.9% to 27.6% as effective depth was increased from 261.5 mm to 523 mm.

https://doi.org/10.31462/jseam.2022.04238248


İrfan Kocaman Muhammet Yılmaz Fatih Tosunoğlu İlker Kazaz

Determination of the structural behavior of historical monuments under different loading types is a crucial task for the preservation and conservation of these structures for transferring to future generations. In this study, the behavior of 800 years old historical Erzurum Çobandede bridge under flood load is investigated. To determine the flood load subjected to the bridge, the best probability distribution model was selected for the observed data obtained from flow gauging stations in the nearby Kağızman Basin and then flood data at different return periods were estimated with this model. The behavior of the bridge under maximum flood load is determined. It is specified that the bridge will not suffer serious damage under the possible maximum flood load in different return periods.

https://doi.org/10.31462/jseam.2022.04249263


Ali Fuat Genç Ahmet Can Altunışık Murat Günaydın Fatih Yesevi Okur

Historical masonry structures have an important place in cultural heritage. Therefore, maintenance of these structures should be made periodically to prevent natural and manmade hazards. The maintenance of these structures is divided into two parts, namely experimental and numerical applications. Experimental, especially non-destructive methods are crucial for increasing the knowledge level of historical structures. Also, experimental tests provide information data that is used in the modal updating process of numerical models. Thus, simulations that are impossible to make experimentally can be easily carried out with updated numerical models. In this paper, a historical masonry mosque called İskenderpaşa and its minaret is investigated by nondestructive experimental tests. Also, finite element models of both structures are created by ANSYS software. To obtain reliable numerical models, finite element model updating processes are made with the aid of experimental data. At the end of the study, the differences between natural frequencies are reduced from 18.6% to 4.9% for the mosque and from 15.2% to 4.8% for the minaret. According to the study, the modulus of elasticity is the most effective update parameter for both structures.

https://doi.org/10.31462/jseam.2022.04264276


Gökhan Adıyaman

This study considers free vibration analysis of a porous functionally graded (FG) beam using a higher-order shear deformation theory (HSDT). The change in the material properties is described by a power law. The porosity distribution functions, one for even cases and two for uneven cases, are considered in the problem. The governing equations are derived utilizing Lagrange’s principle. The solution to the problem is carried out using FEM with a three-node and 12-DOF element. Dimensionless natural frequencies obtained in the present study are compared to those reported in four studies from the literature for validation purposes. The effect of material properties, porosity, and boundary conditions on the dimensionless neutral frequencies and mode shapes are investigated with the help of a parametric study.

https://doi.org/10.31462/jseam.2022.04277288


Mustafa Albayrak Ahmet Murat Aşan Mete Onur Kaman İlyas Bozkurt

This study aims to produce glass fiber composite plates by vacuum infusion method and to determine the interlaminar shear strength (ILSS) under the short beam test. For this purpose, composite plates were produced under the effect of vacuum and temperature by adding glass fiber layers on a flat vacuum table. Short beam tests were carried out on the obtained laminated composite plates and the interlayer shear strength, which is generally characterized by delamination damage, was investigated. In the numerical part, the tests were modeled using the LS-DYNA finite element package program, and the Hashin damage criterion-based material model was used to see the damages that occurred in the composite structure after the tests.

https://doi.org/10.31462/jseam.2022.04289299