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- 검색키워드
- 저자 : Khaled Ghaedi (검색결과 3 건)
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Khaled Ghaedi,Mohammed Jameel,Zainah Ibrahim,P. Khanzaei 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.1
This paper compares the analysis of a Roller Compacted Concrete (RCC) dam with and without galleries under seismic loading. The effects of different sizes and shapes (circle, octagon and square) of gallery have also seen in the analysis. For this purpose, twodimensional (2D) Finite Element Model (FEM) is used for nonlinear dynamic analysis by means of finite element software, ABAQUS. In addition, Concrete Damaged Plasticity (CDP) model is also implemented to inspect the tensile damage of the dam during earthquake excitation. Kinta RCC dam of Malaysia is considered as a case study in analysis. From the seismic analysis, it was found that by increasing the size of openings, stress is developed around the galleries. As a result, the gallery with circle shape is more appropriate for the dam in comparison to gallery with square and octagon shapes. From crack propagation analysis and displacement response, it was also found that the gallery with circle shape behaves better than the gallery with square and octagon shaped.
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Khaled Ghaedi,Farzad Hejazi,Zainah Ibrahim,Parveen Khanzaei 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.4
Recently, Roller Compacted Concrete (RCC) dams have become one of the most applicable types of dams across the globe. However,the basic challenge in analysis of RCC dams is evaluation of the actual response under earthquake excitations with considering flexiblefoundation and impounded water. For this purpose, a finite element model of RCC Dam-Reservoir-Foundation is accurately developedand dynamic time history analysis is utilized to assess the seismic responses in terms of acceleration, displacements, stresses, crackingpatterns and crack propagation by implementation of concrete damaged plasticity model. A verification model is carried out to show thework accuracy. Based on these explanations, the obtained results showed that, however, the hydrodynamic pressure due to the reservoirwater had great influence on seismic responses of the RCC dam with rigid foundation especially in terms of displacement response butoverall responses of the dam are greatly fluctuated while flexible foundation is taken into consideration
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Mohamed Kamruzzaman,MohdZamin Jumaat,N.H. Ramli Sulong,Kambiz Narmashiri,Khaled Ghaedi,Md. Akter Hosen 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.3
In recent decades, the application of carbon fi bre-reinforced polymer (CFRP) composites for strengthening structural elements has become an effi cient option to meet the increased cyclic loads, or repair due to fatigue cracking. The premature failure due to end-debonding is a key limitation to achieve high fatigue performance of strengthened steel beams with externally bonded CFRP plates. The objective of this study is to explore the reinforcing techniques using the CFRP in-plane end cutting shapes and the triangular spew fi llet of adhesive at the tips of the plate to care for fatigue damaged of wide-fl ange steel I-beams due to end-debonding. Four in-plane CFRP end cutting shapes were chosen, namely: rectangular, semi-elliptical, semi-circular and trapezoidal. The application of the trapezoidal end shape was found to be the best confi guration for delaying the end-debonding failure mode and high fatigue life compared to the other CFRP in-plane end cutting shapes. Applying the triangular spew fi llets of adhesive signifi cantly increased the end-debonding and steel beam fracture initiation life of the strengthened beams.
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