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RISS 인기검색어
- 검색키워드
- 저자 : Abang Abdullah Abang Ali (검색결과 5 건)
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Mohammad Panjehpour,Abang Abdullah Abang Ali,Yen Lei Voo,Farah Nora Aznieta 사단법인 한국계산역학회 2014 Computers and Concrete, An International Journal Vol.13 No.1
Strut-and-tie model (STM) has been recommended by many codes and standards as a rationalmodel for discontinuity regions in structural members. STM has been adopted in ACI building code foranalysis of reinforced concrete (RC) deep beams since 2002. However, STM recommended by ACI 318-11is only applicable for analysis of ordinary RC deep beams. This paper aims to develop the STM for CFRPstrengthened RC deep beams through the strut effectiveness factor recommended by ACI 318-11. Two setsof RC deep beams were cast and tested in this research. Each set consisted of six simply-supportedspecimens loaded in four-point bending. The first set had no CFRP strengthening while the second wasstrengthened by means of CFRP sheets using two-side wet lay-up system. Each set consisted of six RC deepbeams with shear span to effective depth ratio of 0.75, 1.00, 1.25, 1.50, 1.75, and 2.00.The value of struteffectiveness factor recommended by ACI 318-11 is modified using a proposed empirical relationship in thisresearch. The empirical relationship is established based on shear span to effective depth ratio.
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Energy absorption of reinforced concrete deep beams strengthened with CFRP sheet
Mohammad Panjehpour,Abang Abdullah Abang Ali,Farah Nora Aznieta 국제구조공학회 2014 Steel and Composite Structures, An International J Vol.16 No.5
The function of carbon fibre reinforced polymer (CFRP) reinforcement in increasing the ductility of reinforced concrete (RC) deep beam is important in such shear-sensitive RC member. This paper aims to investigate the effect of CFRP-strengthening on the energy absorption of RC deep beams. Six ordinary RC deep beams and six CFRP-strengthened RC deep beams with shear span to the effective depth ratio of 0.75, 1.00, 1.25, 1.50, 1.75, and 2.00 were tested till failure in this research. An empirical relationship was established to obtain the energy absorption of CFRP-strengthened RC deep beams. The shear span to the effective depth ratio and growth of energy absorption of CFRP-strengthened deep beam were the significant factors to establish this relationship.
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Repair of precracked RC rectangular shear beams using CFRP strip technique
Abdul Aziz Abdul Samad,Abang Abdullah Abang Ali,J. Jayaprakash,Ashrabov Anvar Abbasovich 국제구조공학회 2007 Structural Engineering and Mechanics, An Int'l Jou Vol.26 No.4
The exploitation of fibre reinforced polymer composites, as external reinforcement is an evergreen and well-known technique for improving the structural performance of reinforced concrete structures. The demand to use FRP composites in the civil engineering industry is mainly due to its high strength, light weight, and stiffness. This paper exemplifies the shear strength of partially precracked reinforced concrete rectangular beams repaired with externally bonded Bi-Directional Carbon Fibre Reinforced Polymer (CFRP) Fabrics strips. All specimens were cast in the laboratory environment without any internal shear reinforcement. The test parameters were longitudinal tensile reinforcement, shear span to effective depth ratio, spacing of CFRP strips, and orientation of CFRP reinforcement. It mainly focuses on the shear capacity and modes of failure of the CFRP strengthened shear beams. Results have shown that the CFRP repaired beams attained a shear enhancement of 32% and 107.64% greater than the control beams. This study underscores that the CFRP strip technique significantly enhanced the shear capacity of precracked reinforced concrete rectangular beams without any internal shear reinforcement.
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Repair of precracked RC rectangular shear beams using CFRP strip technique
Jayaprakash, J.,Samad, Abdul Aziz Abdul,Abbasovich, Ashrabov Anvar,Ali, Abang Abdullah Abang Techno-Press 2007 Structural Engineering and Mechanics, An Int'l Jou Vol.26 No.4
The exploitation of fibre reinforced polymer composites, as external reinforcement is an evergreen and well-known technique for improving the structural performance of reinforced concrete structures. The demand to use FRP composites in the civil engineering industry is mainly due to its high strength, light weight, and stiffness. This paper exemplifies the shear strength of partially precracked reinforced concrete rectangular beams repaired with externally bonded Bi-Directional Carbon Fibre Reinforced Polymer (CFRP) Fabrics strips. All specimens were cast in the laboratory environment without any internal shear reinforcement. The test parameters were longitudinal tensile reinforcement, shear span to effective depth ratio, spacing of CFRP strips, and orientation of CFRP reinforcement. It mainly focuses on the shear capacity and modes of failure of the CFRP strengthened shear beams. Results have shown that the CFRP repaired beams attained a shear enhancement of 32% and 107.64% greater than the control beams. This study underscores that the CFRP strip technique significantly enhanced the shear capacity of precracked reinforced concrete rectangular beams without any internal shear reinforcement.
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A new precast wall connection subjected to monotonic loading
Ramin Vaghei,Farzad Hejazi,Hafez Taheri,Mohd Saleh Jaafar,Abang Abdullah Abang Ali 사단법인 한국계산역학회 2016 Computers and Concrete, An International Journal Vol.17 No.1
Final construction project cost is significantly determined by construction rate. The Industrialized Building System (IBS) was promoted to enhance the importance of prefabrication technology rather than conventional methods in construction. Ensuring the stability of a building constructed by using IBS is a challenging issue. Accordingly, the connections in a prefabricated building have a basic, natural, and essential role in providing the best continuity among the members of the building. Deficiencies of conventional precast connections were observed when precast buildings experience a large induced load, such as earthquakes and other disasters. Thus, researchers aim to determine the behavior of precast concrete structure with a specific type of connection. To clarify this problem, this study investigates the capacity behavior of precast concrete panel connections for industrial buildings with a new type of precast wall-to-wall connection (i.e., U-shaped steel channel connection). This capacity behavior is compared with the capacity behavior of precast concrete panel connections for industrial buildings that used a common approach (i.e., loop connection), which is subjected to monotonic loading as in-plane and out-of-plane loading by developing a finite element model. The principal stress distribution, deformation of concrete panels and welded wire mesh (BRC) reinforcements, plastic strain trend in the concrete panels and connections, and crack propagations are investigated for the aforementioned connection. Pushover analysis revealed that loop connections have significant defects in terms of strength for in-plane and out-of-plane loads at three translational degrees of freedom compared with the U-shaped steel channel connection.
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