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RISS 인기검색어
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The Role of values in psychology and human development
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Session B : Carbohydrates ^ Lipids and Natural Product Chemistry : RECONSTITUTION OF NICOTINIC ACETYLCHOLINE RECEPTOR
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법적 논의와 판결의 합리성 - 대화이론과 절차보장론을 중심으로 -
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Resolution of Electroconvulsive Therapy Refractory Major Depressive Disorder With Unintentiona Hypoglycemic Seizure: A Case Report
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1/4 선택 필터를 이용한 번짐 영상의 외곽선 복원
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지하수위에 따른 적양배추^ 브로콜리^ 양상추의 수분 이용효율 특성
- 검색키워드
- 저자 : Gehan A. Hamdy (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Gehan A. Hamdy,Osama A. Kamal,Mohamed O.R. El-Hariri,Tarik S. El-Salakawy 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.65 No.5
This paper addresses numerical modeling and nonlinear analysis of unreinforced masonry walls and vaults externally strengthened using fiber reinforced polymers (FRP). The aim of the research is to provide a simple method for design of strengthening interventions for masonry arched structures while considering the nonlinear behavior. Several brick masonry walls and vaults externally strengthened by FRP which have been previously tested experimentally are modeled using finite elements. Numerical modeling and nonlinear analysis are performed using commercial software. Description of the modeling, material characterization and solution parameters are given. The obtained numerical results demonstrate that externally applied FRP strengthening increased the ultimate capacity of the walls and vaults and improved their failure mode. The numerical results are in good agreement with the experimentally obtained ultimate failure load, maximum displacement and crack pattern; which demonstrates the capability of the proposed modeling scheme to simulate efficiently the actual behavior of FRP-strengthened masonry elements. Application is made on a historic masonry dome and the numerical analysis managed to explain its structural behavior before and after strengthening. The modeling approach may thus be regarded a practical and valid tool for design of strengthening interventions for contemporary or historic unreinforced masonry elements using externally bonded FRP.
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Hamdy, Gehan A.,Kamal, Osama A.,El-Hariri, Mohamed O.R.,El-Salakawy, Tarik S. Techno-Press 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.65 No.5
This paper addresses numerical modeling and nonlinear analysis of unreinforced masonry walls and vaults externally strengthened using fiber reinforced polymers (FRP). The aim of the research is to provide a simple method for design of strengthening interventions for masonry arched structures while considering the nonlinear behavior. Several brick masonry walls and vaults externally strengthened by FRP which have been previously tested experimentally are modeled using finite elements. Numerical modeling and nonlinear analysis are performed using commercial software. Description of the modeling, material characterization and solution parameters are given. The obtained numerical results demonstrate that externally applied FRP strengthening increased the ultimate capacity of the walls and vaults and improved their failure mode. The numerical results are in good agreement with the experimentally obtained ultimate failure load, maximum displacement and crack pattern; which demonstrates the capability of the proposed modeling scheme to simulate efficiently the actual behavior of FRP-strengthened masonry elements. Application is made on a historic masonry dome and the numerical analysis managed to explain its structural behavior before and after strengthening. The modeling approach may thus be regarded a practical and valid tool for design of strengthening interventions for contemporary or historic unreinforced masonry elements using externally bonded FRP.
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Efficiency of insulation layers in fire protection of FRP-confined RC columns-numerical study
Osama O. El-Mahdy,Gehan A. Hamdy,Mohammed Hisham 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.77 No.5
This paper addresses the efficiency of thermal insulation layers applied to protect structural elements strengthened by fiber-reinforced polymers (FRP) in the case of fire event. The paper presents numerical modeling and nonlinear analysis of reinforced concrete (RC) columns externally strengthened by FRP and protected by thermal insulation layers when subjected to elevated temperature specified by standard fire tests, in order to predict their residual capacity and fire endurance. The adopted numerical approach uses commercial software includes heat transfer, variation of thermal and mechanical properties of concrete, steel reinforcement, FRP and insulation material with elevated temperature. The numerical results show good agreement with published results of full-scale fire tests. A parametric study was conducted to investigate the influence of several variables on the structural response and residual capacity of insulated FRP-confined columns loaded by service loads when exposed to fire. The residual capacity of FRP-confined RC column was affected by concrete grade and insulation material and was shown to improve substantially by increasing the concrete cover and insulation layer thickness. By increasing the VG insulation layer thickness 15, 32, 44, 57 mm, the loss in column capacity after 5 hours of fire was 30%, 13%, 7% and 5%, respectively. The obtained results demonstrate the validity of the presented approach for estimation of fire endurance and residual strength, as an alternative for fire testing, and for design of fire protection layers for FRP-confined RC columns.
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