The Experts below are selected from a list of 35718 Experts worldwide ranked by ideXlab platform
Antonio Nanni - One of the best experts on this subject based on the ideXlab platform.
-
Interaction Diagram methodology for design of frp confined reinforced concrete columns
Construction and Building Materials, 2009Co-Authors: Silvia Rocca, Nestore Galati, Antonio NanniAbstract:This paper presents a procedure that allows the construction of a simplified axial load – bending moment Interaction Diagram for FRP-wrapped Reinforced Concrete (RC) columns of circular and non-circular cross-sections for practical design applications. In the proposed methodology, the analysis of FRP-confined columns is carried out based on principles of equilibrium and strain compatibility equivalent to that of conventional RC columns, the primary difference being the use of the stress–strain model for FRP-confined concrete developed by Lam and Teng. Based on the consideration that the strength enhancement is of significance in members where compression is the controlling failure mode, only the portion of the Interaction Diagram corresponding to this type of failure is the focus of the methodology. Experimental evidence from RC specimens with a minimum side dimension of 300 mm (12 in.) and subjected to combined axial compression and flexure was collected and compared to the theoretical Interaction Diagrams. Even though limited experimentation has been conducted in the compression-controlled region for such type of members, data points appear to be consistent with the analytical predictions. A design method for RC members is therefore proposed following the principles of the ACI building code.
Brahim Benmokrane - One of the best experts on this subject based on the ideXlab platform.
-
axial load moment Interaction Diagram of full scale circular lwscc columns reinforced with bfrp and gfrp bars and spirals experimental and theoretical investigations
Engineering Structures, 2021Co-Authors: Abdoulaye Sanni Bakouregui, Hamdy M Mohamed, Ammar Yahia, Brahim BenmokraneAbstract:Abstract No research has yet been reported on the behavior of lightweight-aggregate self-consolidating concrete (LWSCC) columns reinforced with fiber-reinforced polymer (FRP) bars. LWSCC can be of great interest for reducing dead loads, section dimensions, and project costs, especially for precast elements. This paper presents, for the first time, the test results of a study conducted on 12 circular LWSCC columns reinforced with two types of FRP bars: basalt FRP (BFRP) and glass FRP (GFRP). In addition, columns with steel reinforcement were introduced into the test matrix as references. A mix design for the LWSCC with an equilibrium density of 1,807 kg/m3 and compressive strength of 52 MPa was developed and used to cast the columns. The columns were tested under concentric and eccentric loading. The test variables were the eccentricity-to-diameter ratio, and the type of reinforcement (steel versus GFRP and BFRP). The study was conducted to investigate whether the type of concrete and reinforcement affect the column performance and to develop the experimental load–moment Interaction Diagram. The load–strain behavior for the concrete, bars, and spirals; the load-deformation curves (axial and lateral); and the experimental P–M Interaction Diagrams are presented. An analytical study was conducted to predict the axial–flexural capacity. The effect of concrete density was considered in the analysis based on parameters in the codes for conventional and modified rectangular stress blocks. The test results indicate that the LWSCC columns with BFRP and GFRP reinforcement had behavior and strength comparable to their steel-reinforced counterparts when tested under different levels of eccentricity. The analytical results show that the column capacity was sensitive to variations in the rectangular stress-block parameters. Lastly, this study demonstrated the effectiveness of integrating GFRP and BFRP reinforcement into lightweight-aggregate concrete would play a role in producing lighter and more durable concrete members for precast applications.
-
axial load moment Interaction Diagram of circular concrete columns reinforced with cfrp bars and spirals experimental and theoretical investigations
Journal of Composites for Construction, 2016Co-Authors: Abdeldayem Hadhood, Hamdy M Mohamed, Brahim BenmokraneAbstract:AbstractNorth America’s current design codes and guidelines allow the use of fiber–reinforced polymer (FRP) bars as the primary reinforcement in concrete structures and provide design recommendations for using these bars. Because of a lack of experimental data, however, FRP bars have not been recommended for resisting compression stresses as longitudinal reinforcement in columns or compression reinforcement in flexural elements. This paper presents test results of an experimental program to investigate the structural performance of 10 full-scale circular concrete columns reinforced with carbon fiber–reinforced polymer (CFRP) bars and spirals subjected to combined axial compression loads and bending moments. The test variables include different eccentricity-to-diameter ratios and two types of reinforcement (CFRP and steel). The test results show that the CFRP- and steel-reinforced concrete columns behaved similarly up to their peak loads. The failure of the test specimens under different levels of eccentri...
Hamid Dalir - One of the best experts on this subject based on the ideXlab platform.
-
Bree's Diagram of a functionally graded thick-walled cylinder under thermo-mechanical loading considering nonlinear kinematic hardening
Case Studies in Thermal Engineering, 2018Co-Authors: Mohsen Damadam, Reza Moheimani, Hamid DalirAbstract:Abstract In this paper, elasto-plastic analysis of a thick-walled cylinder made of functionally graded materials (FGMs) subjected to constant internal pressure and cyclic temperature gradient loading is carried out using MATLAB. The material is assumed to be isotropic and independent of temperature with constant Poisson's ratio and the material properties vary radially based on a power law volume function relation. The Von Mises’ yield criterion and the Armstrong-Frederick nonlinear kinematic hardening model were implemented in this investigation. To obtain the incremental plastic strain, return mapping algorithm (RMA) was used. At the end, the Bree's Interaction Diagram is plotted in terms of non-dimensional pressure and temperature which represents an engineering index for optimum design under thermo-mechanical loading.
-
Bree's Diagram of a functionally graded thick-walled cylinder under thermo-mechanical loading considering nonlinear kinematic hardening
Elsevier, 2018Co-Authors: Mohsen Damadam, Reza Moheimani, Hamid DalirAbstract:In this paper, elasto-plastic analysis of a thick-walled cylinder made of functionally graded materials (FGMs) subjected to constant internal pressure and cyclic temperature gradient loading is carried out using MATLAB. The material is assumed to be isotropic and independent of temperature with constant Poisson's ratio and the material properties vary radially based on a power law volume function relation. The Von Mises’ yield criterion and the Armstrong-Frederick nonlinear kinematic hardening model were implemented in this investigation. To obtain the incremental plastic strain, return mapping algorithm (RMA) was used. At the end, the Bree's Interaction Diagram is plotted in terms of non-dimensional pressure and temperature which represents an engineering index for optimum design under thermo-mechanical loading. Keywords: Functionally graded material, Nonlinear kinematic hardening, Thermal/mechanical stress, Return mapping algorithm, Shakedown, Ratcheting, Bree's diagra
Muhammad N S Hadi - One of the best experts on this subject based on the ideXlab platform.
-
load and moment Interaction Diagram for circular concrete columns reinforced with gfrp bars and gfrp helices
Journal of Composites for Construction, 2017Co-Authors: Hogr Karim, Neaz M Sheikh, Muhammad N S HadiAbstract:AbstractThis paper presents analytical and experimental studies on the axial load-bending moment behavior of glass fiber–reinforced polymer (GFRP) bars and helices RC columns. The nominal axial load and bending moment of the columns were analyzed based on the stress-strain behavior of the cross-sectional components. A numerical integration method was used to determine the compressive force of concrete in the compression region. The analytical results were verified with experimental results of 12 circular specimens reinforced with GFRP bars and GFRP helices. Out of these 12 specimens, eight specimens were taken from available literature and four specimens were tested in this study. The influences of different parameters such as loading conditions, spacing of the GFRP helices, and wrapping the specimens with carbon fiber–reinforced polymer (CFRP) sheets on the behavior of GFRP-RC specimens were investigated. A parametric study was also carried out to investigate the effects of longitudinal and transverse GF...
Abdeldayem Hadhood - One of the best experts on this subject based on the ideXlab platform.
-
axial load moment Interaction Diagram of circular concrete columns reinforced with cfrp bars and spirals experimental and theoretical investigations
Journal of Composites for Construction, 2016Co-Authors: Abdeldayem Hadhood, Hamdy M Mohamed, Brahim BenmokraneAbstract:AbstractNorth America’s current design codes and guidelines allow the use of fiber–reinforced polymer (FRP) bars as the primary reinforcement in concrete structures and provide design recommendations for using these bars. Because of a lack of experimental data, however, FRP bars have not been recommended for resisting compression stresses as longitudinal reinforcement in columns or compression reinforcement in flexural elements. This paper presents test results of an experimental program to investigate the structural performance of 10 full-scale circular concrete columns reinforced with carbon fiber–reinforced polymer (CFRP) bars and spirals subjected to combined axial compression loads and bending moments. The test variables include different eccentricity-to-diameter ratios and two types of reinforcement (CFRP and steel). The test results show that the CFRP- and steel-reinforced concrete columns behaved similarly up to their peak loads. The failure of the test specimens under different levels of eccentri...