The Experts below are selected from a list of 23478 Experts worldwide ranked by ideXlab platform
Sid Ahmed Meftah - One of the best experts on this subject based on the ideXlab platform.
-
Lateral Stiffness and vibration characteristics of composite plated rc shear walls with variable fibres spacing
Materials & Design, 2008Co-Authors: Sid Ahmed Meftah, Abdelouahed Tounsi, R Yeghnem, E Adda A BediaAbstract:In this paper, a finite element model for static and free vibration analysis of reinforced concrete (RC) shear walls structures strengthened with thin composite plates having variable fibres spacing is presented. An efficient analysis method that can be used regardless to the sizes and location of the bonded plates is proposed in this study. In the numerical formulation, the adherents and the adhesives are all modelled as shear wall elements, using the mixed finite element method. Several test problems are examined to demonstrate the accuracy and effectiveness of the proposed method. Numerical results are obtained for six nonuniform distributions of E-glass, graphite and boron fibres in epoxy matrices. The fibre redistributions of the bonded plates are seen to increase the frequencies modes and reduce substantially the Lateral displacements.
-
Lateral Stiffness and vibration characteristics of damaged rc coupled shear walls strengthened with thin composite plates
Building and Environment, 2007Co-Authors: Sid Ahmed Meftah, Abdelouahed TounsiAbstract:This paper deals with the bending and vibration analysis of moderately damaged coupled shear wall structures with externally bonded carbon fiber-reinforced polymer (CFRP) sheets. In the analytical formulation, the adherent and the adhesive layers are all modelled as shear walls, using the mixed finite-element method (FEM). The anisotropic damage model is adopted to describe the damage extent of the RC coupled shear walls. A free vibration analysis is carried out to determine the frequencies of multi-storey strengthened shear wall structures with openings. Test problems are conducted to demonstrate the accuracy and effectiveness of the proposed method. Numerical results are presented to show the performance of reinforced concrete coupled shear wall structures bonded with composite plates in which a damaged RC shear wall with openings strengthened by a thin steel sheets is treated as a comparator. The effects of damage extent and of the bonded sheets on the bending and vibration characteristics of damaged RC coupled shear wall structures are also studied.
-
Lateral Stiffness and vibration characteristics of rc shear walls bonded with thin composite plates
Composite Structures, 2006Co-Authors: Sid Ahmed Meftah, Abdelouahed Tounsi, A Megueni, E Adda A BediaAbstract:This paper deal with the bending and vibration analysis of shear wall structures strengthened by bonded composite plates. In the analytical formulation, the adherents and the adhesives are all modeled as shear walls elements, using the mixed finite element method. A free vibration analysis is carried out to determine the frequencies of multistory strengthened shear wall structures. Several test problems are examined to demonstrate the accuracy and effectiveness of the proposed method. Numerical results are presented that relates to the performance of reinforced concrete shear walls bonded with composite plates, in which a reinforced concrete shear wall strengthened by steel plates is treated as a limiting case. The effects of bonded plates on vibration characteristics of RC shear walls are also studied.
Abdelouahed Tounsi - One of the best experts on this subject based on the ideXlab platform.
-
Lateral Stiffness and vibration characteristics of composite plated rc shear walls with variable fibres spacing
Materials & Design, 2008Co-Authors: Sid Ahmed Meftah, Abdelouahed Tounsi, R Yeghnem, E Adda A BediaAbstract:In this paper, a finite element model for static and free vibration analysis of reinforced concrete (RC) shear walls structures strengthened with thin composite plates having variable fibres spacing is presented. An efficient analysis method that can be used regardless to the sizes and location of the bonded plates is proposed in this study. In the numerical formulation, the adherents and the adhesives are all modelled as shear wall elements, using the mixed finite element method. Several test problems are examined to demonstrate the accuracy and effectiveness of the proposed method. Numerical results are obtained for six nonuniform distributions of E-glass, graphite and boron fibres in epoxy matrices. The fibre redistributions of the bonded plates are seen to increase the frequencies modes and reduce substantially the Lateral displacements.
-
Lateral Stiffness and vibration characteristics of damaged rc coupled shear walls strengthened with thin composite plates
Building and Environment, 2007Co-Authors: Sid Ahmed Meftah, Abdelouahed TounsiAbstract:This paper deals with the bending and vibration analysis of moderately damaged coupled shear wall structures with externally bonded carbon fiber-reinforced polymer (CFRP) sheets. In the analytical formulation, the adherent and the adhesive layers are all modelled as shear walls, using the mixed finite-element method (FEM). The anisotropic damage model is adopted to describe the damage extent of the RC coupled shear walls. A free vibration analysis is carried out to determine the frequencies of multi-storey strengthened shear wall structures with openings. Test problems are conducted to demonstrate the accuracy and effectiveness of the proposed method. Numerical results are presented to show the performance of reinforced concrete coupled shear wall structures bonded with composite plates in which a damaged RC shear wall with openings strengthened by a thin steel sheets is treated as a comparator. The effects of damage extent and of the bonded sheets on the bending and vibration characteristics of damaged RC coupled shear wall structures are also studied.
-
Lateral Stiffness and vibration characteristics of rc shear walls bonded with thin composite plates
Composite Structures, 2006Co-Authors: Sid Ahmed Meftah, Abdelouahed Tounsi, A Megueni, E Adda A BediaAbstract:This paper deal with the bending and vibration analysis of shear wall structures strengthened by bonded composite plates. In the analytical formulation, the adherents and the adhesives are all modeled as shear walls elements, using the mixed finite element method. A free vibration analysis is carried out to determine the frequencies of multistory strengthened shear wall structures. Several test problems are examined to demonstrate the accuracy and effectiveness of the proposed method. Numerical results are presented that relates to the performance of reinforced concrete shear walls bonded with composite plates, in which a reinforced concrete shear wall strengthened by steel plates is treated as a limiting case. The effects of bonded plates on vibration characteristics of RC shear walls are also studied.
E Adda A Bedia - One of the best experts on this subject based on the ideXlab platform.
-
Lateral Stiffness and vibration characteristics of composite plated rc shear walls with variable fibres spacing
Materials & Design, 2008Co-Authors: Sid Ahmed Meftah, Abdelouahed Tounsi, R Yeghnem, E Adda A BediaAbstract:In this paper, a finite element model for static and free vibration analysis of reinforced concrete (RC) shear walls structures strengthened with thin composite plates having variable fibres spacing is presented. An efficient analysis method that can be used regardless to the sizes and location of the bonded plates is proposed in this study. In the numerical formulation, the adherents and the adhesives are all modelled as shear wall elements, using the mixed finite element method. Several test problems are examined to demonstrate the accuracy and effectiveness of the proposed method. Numerical results are obtained for six nonuniform distributions of E-glass, graphite and boron fibres in epoxy matrices. The fibre redistributions of the bonded plates are seen to increase the frequencies modes and reduce substantially the Lateral displacements.
-
Lateral Stiffness and vibration characteristics of rc shear walls bonded with thin composite plates
Composite Structures, 2006Co-Authors: Sid Ahmed Meftah, Abdelouahed Tounsi, A Megueni, E Adda A BediaAbstract:This paper deal with the bending and vibration analysis of shear wall structures strengthened by bonded composite plates. In the analytical formulation, the adherents and the adhesives are all modeled as shear walls elements, using the mixed finite element method. A free vibration analysis is carried out to determine the frequencies of multistory strengthened shear wall structures. Several test problems are examined to demonstrate the accuracy and effectiveness of the proposed method. Numerical results are presented that relates to the performance of reinforced concrete shear walls bonded with composite plates, in which a reinforced concrete shear wall strengthened by steel plates is treated as a limiting case. The effects of bonded plates on vibration characteristics of RC shear walls are also studied.
Feng Zhang - One of the best experts on this subject based on the ideXlab platform.
-
Simplified calculation of shear lag effect for high-rise diagrid tube structures
Journal of building engineering, 2019Co-Authors: Feng ZhangAbstract:Abstract A high-rise diagrid tube structure is a new type of building structural system that can provide greater Lateral Stiffness. Simplified calculation methods for diagrid tube structures have been studied by scholars in recent years, but the shear lag effects in such structures have not been reviewed. The shear lag effect will affect the Lateral Stiffness and stress distribution of a tube structure, so it is necessary to propose a simplified calculation method that can consider the shear lag effect of diagrid tube structures. This paper adopts the principle of Stiffness equivalence to equate a high-rise diagrid tube structure to an elastic orthotropic membrane, constructs the stress function considering the shear lag effect under the action of typical horizontal loads, and obtains the stress function through the principle of energy variation. A simplified calculation method is achieved; calculation formulas for the components internal forces and structural displacements are deduced and compared with a detailed finite element program calculation to verify the method. Further, through the simplified calculation method proposed in this paper, two key issues (angle optimization of diagonal columns and evaluation of the shear lag effect at any aspect ratio) are solved in the preliminary design of this kind of structure. Results of this paper can provide a theoretical reference for the preliminary design of a diagrid tube structure. Under the basic condition that only the aspect ratio of the structure is known, the optimal angle of diagonal column can be determined, and the shear lag effect of the diagrid structure can be quickly estimated by the proposed simplified method.
A Neuenhofer - One of the best experts on this subject based on the ideXlab platform.
-
Lateral Stiffness of shear walls with openings
Journal of Structural Engineering-asce, 2006Co-Authors: A NeuenhoferAbstract:This technical note investigates the accuracy of a simplified hand method recommended in several design guidelines for practicing structural engineers for calculating the Lateral Stiffness of shear walls with openings. Parametric studies are performed in which the location and size of the opening as well as the aspect ratio of the wall are varied. Toward this goal, a special-purpose finite-element algorithm is developed and implemented in the computing package MATLAB. Results from finite-element analysis are compared to those of the hand method. It is found that the hand method, despite its complexity, is highly approximate and often enormously overestimates the Stiffness of shear walls with openings.
