İnşaat Mühendisliği Bölümü

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Citation Count: Soysal, Berat Feyza; Arici, Yalin; Tuncay, K. (2022). "A Modified Applied Element Model for the Simulation of Plain Concrete Behaviour", Magazine of Concrete Research.
A Modified Applied Element Model for the Simulation of Plain Concrete Behaviour
(2022) Soysal, Berat Feyza; Arici, Yalin; Tuncay, Kagan; 157572
A Modified Applied Element Model to simulate the behaviour of plain concrete continuum structures including discrete cracking is proposed in this study. In the classical Applied Element Model, Poisson effects are fully ignored. To remediate this issue, diagonal elements are introduced to include the Poisson effect and the constitutive parameters are rigorously determined using the Cauchy-Born rule and the hyper-elastic theory. The formulation is validated for linear elastic problems, and the consistency and convergence behaviour of the numerical approach is shown. Tensile softening formulation using the concept of fracture energy is utilized for the nonlinear range. In this range, the approach is validated using the classical benchmark tests with pure tensile, split-tensile, combined shear-tensile and bending dominated push-over loading. The load-displacement behaviour and crack response were captured successfully, showing the proposed methodology can be used to quantify discrete cracks on large systems like dam monoliths from initiation to significant damage levels.
Citation Count: Soysal, Berat Feyza; Arıcı, Yalın. (2023). "Crack Width–Seismic Intensity Relationships for Concrete Gravity Dams", Journal of Earthquake Engineering,
Crack Width–Seismic Intensity Relationships for Concrete Gravity Dams
(2023) Soysal, Berat Feyza; Arıcı, Yalın; 157572
Seismic assessment of plain concrete structures like gravity dams is generally conducted based on cracking. The responses of two types of gravity dams, i.e. the conventional and roller compacted concrete (RCC), were investigated in this study using a discrete element tool coupled with special reservoir elements. Using incremental dynamic analysis, the relationship between the seismic intensity measures and crack widths on the U/S face of the monolith was obtained. The damage accumulation on conventional and RCC dams was different: The cumulative cracking on the upstream face of the monolith correlated well to a seismic intensity measure representing base shear.
Citation Count: Arıcı, Yalın; Soysal, berat Feyza. (2022). "Predicting seismic damage on concrete gravity dams: a review", Structure And Infrastructure Engineering.
Predicting seismic damage on concrete gravity dams: a review
(2022) Arıcı, Yalın; Soysal, Berat Feyza; 157572
The seismic assessment of concrete gravity dams is a problem of prediction of cracking and the corresponding consequences. With the widespread use of general-purpose finite element programs, the work in the field has shifted towards quantifying the behaviour in a framework for assessment. The nonlinear analysis and coupling with foundation–reservoir interaction, conversely, is still a challenging task. The modelling approach has significant effects on the analysis results and the assessment framework. The field remains an active area for research with many outstanding issues regarding damage quantification and assessment compared to any other major infrastructure component. A comprehensive overview of the seismic assessment of gravity dams is presented in this work with the goal to outline the issues in the field. Different models and modelling choices are compared in the context of damaged state assessment of gravity dams. The links between practical difficulties and theoretical issues are critically discussed. The aleatoric and epistemic uncertainties in the field, and their sources, are presented. Areas of future work are identified for improvement in seismic assessment as well as reducing and quantifying the uncertainties in the prediction of damaged states for concrete gravity dams.
Citation Count: Soysal, Berat F.; Arici, Y.; Ay, Bekir Ö. (2023). "The effect of vertical motions on damage accumulation on concrete gravity dams", Earthquake Engineering and Structural Dynamics, Vol.52, No.9, pp.2619-2638.
The effect of vertical motions on damage accumulation on concrete gravity dams
(2023) Soysal, Berat Feyza; Arici, Yalin; Ay, Bekir Özer; 157572
The effect of vertical ground motions on the seismic response of dams has long been a concern in the seismic design and evaluation of concrete gravity dams. The guidelines regarding the use of vertical motions in time history analysis (THA) are not clear due to the complexity of the effect as well as the large uncertainty in the motion selection process. The goal of this study is to assess the significance of vertical motions’ effects on concrete gravity dams considering the relevant variability due to ground motion, system frequency response as well as the shaking level. To this end, a carefully selected ground motion set providing realistic vertical(V)/horizontal(H) loading was used in nonlinear THAs of three different systems with different modal properties. In order to evaluate the intensity of shaking on the vertical motions’ effect, the responses were calculated at different seismic levels corresponding to operation, design, and maximum shaking levels. Along with traditional demand parameters commonly employed in assessing seismic response, cracking on the base and at the upstream face of the monolith was adopted as demand measures using a model capable of yielding discrete cracking on the system. The effect of vertical motions was quantified by comparing the response of H + V to H only shaking. The results show the vertical shaking can significantly affect upstream cracking for the operation or design level earthquakes, the effect increasing for larger dams

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