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- 저자 : Kohnehpooshi, O. (검색결과 2 건)
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Kohnehpooshi, O.,Noorzaei, J.,Jaafar, M.S.,Saifulnaz, M.R.R. Techno-Press 2011 Interaction and multiscale mechanics Vol.4 No.4
The analysis of interfacial stresses in structural component has been the subject of several investigations but it still requires more effort and studies. In this study a general three-dimensional interface element has been formulated for stress and displacement analyses in the interfacial area between two adjacent plate bending element and brick element. Interface element has 16 nodes with 5 degrees of freedom (DOF) in each node adjacent to plate bending element and 3 DOF in each node adjacent to brick element. The interface element has ability to transfer three translations from each side of interface element and two rotations in the side adjacent to the plate element. Stiffness matrix of this element was formulated and implemented in three-dimensional finite element code. Application of this element to the reinforced concrete (RC) beam strengthened with fiber reinforced polymer (FRP) including variation of deflection, slip between plate and concrete, normal and shear stresses distributions in FRP plates have been verified using experimental and numerical work of strengthened RC beams carried out by some researchers. The results show that this interface element is effective and can be used for structural component with these types of interface elements.
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Omid Kohnehpooshi,Mohd Saleh Jaafar,Jamaloddin Noorzaei,Raizal Saifulnaz Muhammad Rashid 대한토목학회 2011 KSCE JOURNAL OF CIVIL ENGINEERING Vol.15 No.6
Reinforced concrete beams are generally designed to have enough shear strength to achieve flexural capacity; however, some structural component designed may not have sufficient shear capacity to resist big forces. Therefore, shear strengthening is required to strengthen these components. Aim of this work is to propose 3D finite element formulations of reinforced concrete beams in order to investigate the structural behavior of Reinforced Concrete (RC) beams post-tensioned in the shear region. Twenty seven node lagrangian elements have been used for modeling the concrete. Bar and bond-slip between bar and concrete were modeled together by three dimensional truss-linkage elements. The steel plates which was used for strengthening and to transfer the post-tensioning stresses in shear region to the RC beam, is modeled using 8 node isoparametric plate bending element with five Degrees of Freedom (DOF) in each node. These elements have been added to the existing three dimentional finite element program. Several reinforced concrete beams strengthened or unstrengthened, have been modeled and analyzed to determine the variation of deflection, stresses,and slip between concrete and tendons. The study leads to results that show the significant effectiveness of post-tensioning in the shear region on structural behavior of reinforced concrete beams.
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