Journal of Structural Engineering & Applied Mechanics

Kemal Hacıefendioğlu

The effect of deconvolved stochastic seismic excitation on nonlinear dynamic response of dam-foundation interaction systems is investigated by using the equivalent linear method. For this purpose, three different earthquake input mechanisms which are the standard-rigid-base input model, the massless-foundation input model and the deconvolved-base-rock input model are used. The spatial variability of ground motion which is considered with the incoherence and wave-passage effects is taken into account in the analyses. The Izmit earthquake in 1999 is selected as a ground motion. Two-dimensional interface finite elements are used between the dam-soil deposit and asphalt face. The mean of absolute maximum values of displacements and stresses obtained from the three earthquake input models are compared with each other.

https://doi.org/10.31462/jseam.2019.01155163

İlker Kazaz Muhammed Esat Gürbüz

In this study, tension field inclination angle (α) which forms on thin steel plate of steel plate shear walls is investigated. For this purpose, nonlinear finite element models of selected experimental steel plate shear wall specimens in literature were created. Afterwards, the results of finite element models and the results of experimental investigations compared and a good agreement was attained. After creating and validating the models, the correlation of the inclination angle with different plate parameters such as plate thickness, boundary elements stiffness, width to height ratio of walls were studied. Steel plate shear walls with different aspect ratios were modelled and various boundary element cross sectional areas and plate thicknesses were used. It is observed that inclination angle is not very sensitive to plate thickness and boundary element cross sectional areas but aspect ratios have an apparent effect on the tension field inclination angle. The analysis results show that the inclination angle takes almost a constant value above 0.01 drift ratio. Moreover, it is observed that the tension field inclination angle develops mostly between 35°-45°.

https://doi.org/10.31462/jseam.2019.01164173

Tuğçe Tütüncübaşı Tosun M.Y. Özkan G.S. Yıldız Erdal Çokça

The improvement in design technologies has enhanced the use of different fill materials in construction of the embankment dams. Rockfill is one of the most preferred fill material for embankment dam. Also, use of different fill material such as sand-gravel has been preferred in recent years. Previous studies on concrete faced sand-gravel fill dam (CFSGD), results of the laboratory experiments and in-situ testing analysis display that using sand-gravel as a fill material is not only cost-effective but also safe and provides high quality natural construction material. In this study, settlement of Karacasu Dam, which is the first concrete faced sand-gravel fill dam in Turkey, is examined for “end of construction” and “reservoir impoundment” loading conditions. Deformations are determined by computing two dimensional finite element analyses. Hardening soil model is utilized to obtain non-linear, stress dependent and inelastic behavior of the sand-gravel fill material. Deformations which are calculated by finite element analyses, are compared with the data observed by General Directorate of State Hydraulic Works (DSİ) [12] for both end of the construction and reservoir impoundment periods. The comparison of the results indicates that calculated deformations are generally compatible with the observed ones.

https://doi.org/10.31462/jseam.2019.01174184

Alper Polat Yusuf Kaya Pınar Bora Kouider Bendine Talat Şükrü Özşahin

The difficulty of producing functionally graded materials (FGM) and the fact that they are more expensive than homogeneous materials emerge as an industrial problem. The starting point of this study is to investigate alternative solution methods that will contribute to the mentioned problem. In parallel, the analysis of the contact problem for a layer, which is loaded by a rigid block and resting on the elastic half plane, is presented in this paper. Only the area under the block is considered as FGM, the other parts are considered homogeneous material, unlike the studies in the literature. There is no analytical solution for this study and it is compared with the solution which is completely functionally graded (FG) layer in the literature by using finite element method (FEM). Material properties of the FG layer are defined by the macro added to the ANSYS program. The analysis for the partial FG layer were compared with the completely FG layer analysis as figures and tables, and as a result it was predicted that partial FGM could be used for the static problems and may also be practical applications in the industry.

https://doi.org/10.31462/jseam.2019.01185193

Onur Onat Burak Yön

Compressive strength and modulus of elasticity are the key material properties of historical structures to adapt finite element model to obtain correct structural assessment. Generally, modulus of elasticity is adapted by multiplying compressive strength of the material. In this paper, it is aimed to predict compressive strength of historical masonry buildings by using material characteristics and physical characteristics. For this purpose, 21 historical masonry mosques, churches and cathedrals were selected. Unit weight, wall thickness, height of the structure, plan area and modulus of elasticity of the selected 21 historical structures are listed as material characteristics and physical characteristics for using compressive strength prediction. Artificial Neural Network (ANN) model is used to predict compressive strength of 13 different historical structures. Performance of prediction is verified by using MATLAB among all 34 total historical structures. 0.83 r square is obtained from the prediction model and total prediction performance is obtained from trained data 0.97 and 0.79 from all 34 data by using MATLAB.

https://doi.org/10.31462/jseam.2019.01194198