The Experts below are selected from a list of 51750 Experts worldwide ranked by ideXlab platform
Seyed Mehdi Zahrai - One of the best experts on this subject based on the ideXlab platform.
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effect of bolted shear connectors on the Axial Load bending moment interaction capacity of cft columns
Structures, 2021Co-Authors: Masoud Ami, Seyed Mehdi ZahraiAbstract:Abstract In Concrete-Filled Tubular (CFT) columns under the influence of compressive Loading, an omnilateral confinement pressure is exerted upon the concrete core which leads to increase in the strength, stiffness, and ductility of the column. This paper investigates the influence of bolted shear connectors on the behavior of circular and square CFT columns. Also, a comparison is made between the interactional Axial Load-bending moment (P–M) curves obtained from the numerical analyses and the P–M relationships put forth by different design standards. For this purpose, 18 circular and 9 square CFT columns, categorized into six groups, are subjected to eccentric compressive Loading. The investigated parameters include concrete compressive strength, diameter of the steel tube, Load eccentricity, and the presence of bolted shear connector. In most cases, the presence of bolted shear connectors in the column causes strength and ductility to increase, leading to an improvement in the Axial Load-bending moment (P–M) interaction. The employment of bolted shear connectors at 12.5 cm to 25 cm intervals results in a minimum of 5% and a maximum of 45% increase in the strength of the column.
Yongqiang Zhang - One of the best experts on this subject based on the ideXlab platform.
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Effect of compressive Axial Load on forced transverse vibrations of a double-beam system
International Journal of Mechanical Sciences, 2008Co-Authors: Yongqiang ZhangAbstract:Based on Bernoulli–Euler beam theory, the forced transverse vibrations of an elastically connected simply supported double-beam system under compressive Axial Load are investigated. It is assumed that the two beams of the system are continuously joined by a Winkler elastic layer. The dynamic responses of the system caused by arbitrarily distributed continuous Loads are obtained. The effects of compressive Axial Load on the forced vibrations of the double-beam system are discussed for two cases of particular excitation Loadings. The properties of the forced transverse vibrations of the system are found to be significantly dependent on the compressive Axial Load.
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TRANSVERSE VIBRATIONS OF DOUBLE-WALLED CARBON NANOTUBES UNDER COMPRESSIVE Axial Load
Physics Letters A, 2005Co-Authors: Yongqiang Zhang, Gui-rong Liu, Xu HanAbstract:Abstract Based on the Bernoulli–Euler beam theory, a double-elastic beam model is developed for transverse vibrations of double-walled carbon nanotubes under compressive Axial Load, which includes the interaction of van der Waals force between the inner and outer tubes and the effect of compressive Axial Load. Explicit expressions are derived for natural frequencies and associated amplitude ratios of the inner to the outer tubes for the case of simply supported double-walled carbon nanotubes. The influences of compressive Axial Load on the properties of vibrations are discussed. It is shown that the effects of compressive Axial Load on the natural frequencies of double-walled carbon nanotubes are sensitive to the vibration modes and aspect ratios. The natural frequencies are dependent on the Axial Load and decrease with increasing the Axial Load. However, the associated amplitude ratios of the inner to the outer tubes of double-walled carbon nanotubes are independent of the Axial Load. In addition, the critical Axial buckling stress and strain for simply supported double-walled carbon nanotubes are obtained.
Inrak Choi - One of the best experts on this subject based on the ideXlab platform.
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eccentric Axial Load testing for concrete encased steel columns using 800 mpa steel and 100 mpa concrete
Journal of Structural Engineering-asce, 2012Co-Authors: Changsoo Kim, Honggun Park, Kyungsoo Chung, Inrak ChoiAbstract:AbstractSeven concrete-encased steel columns using high-strength steel (nominal yield strength fys=913 and 806 MPa) and high-strength concrete (cylinder compressive strength fc′=94 and 113 MPa) were tested to investigate the eccentric Axial Load-carrying capacity and the deformation capacity. The test parameters were full or partial concrete-encasement, the eccentricity of the Axial Load, and the effect of lateral reinforcement. Because the yield strain (≈0.004) of the high-strength steel is greater than the ultimate compressive strain (≈0.003) of the concrete subjected to short-term Loads, the current study focused on the effect of early concrete crushing on the behavior of the composite columns. The test results showed that in the case of inadequate lateral confinement, the Load-carrying capacity was limited by the early crushing of concrete. However, because of the high-strength steel section, all test specimens showed ductile flexural behavior after the delamination of the concrete. The test results w...
Cengiz Dundar - One of the best experts on this subject based on the ideXlab platform.
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behaviour of reinforced and concrete encased composite columns subjected to biAxial bending and Axial Load
Building and Environment, 2008Co-Authors: Cengiz Dundar, Serkan Tokgoz, Kamil A Tanrikulu, Tarik BaranAbstract:An experimental investigation of the behaviour of reinforced concrete columns and a theoretical procedure for analysis of both short and slender reinforced and composite columns of arbitrarily shaped cross section subjected to biAxial bending and Axial Load are presented. In the proposed procedure, nonlinear stress–strain relations are assumed for concrete, reinforcing steel and structural steel materials. The compression zone of the concrete section and the entire section of the structural steel are divided into adequate number of segments in order to use various stress–strain models for the analysis. The slenderness effect of the member is taken into account by using the Moment Magnification Method. The proposed procedure was compared with test results of 12 square and three L-shaped reinforced concrete columns subjected to short-term Axial Load and biAxial bending, and also some experimental results available in the literature for composite columns compared with the theoretical results obtained by the proposed procedure and a good degree of accuracy was obtained.
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arbitrarily shaped reinforced concrete members subject to biAxial bending and Axial Load
Computers & Structures, 1993Co-Authors: Cengiz Dundar, B SahinAbstract:Abstract An approach to the ultimate strength calculation and the dimensioning of arbitrarily shaped reinforced concrete sections, subject to combined biAxial bending and Axial compression, is presented. The analysis is performed in accordance with the American Concrete Institute (ACI) code. A computer program is presented for rapid design of arbitrarily shaped reinforced concrete members under biAxial bending and Axial Load. In the proposed method the equilibrium equations are expressed in terms of the three unknowns, e.g. location of neutral axis and amount of total reinforcement area within the cross-section, which lead to three simultaneous nonlinear algebraic equations which are solved by a procedure based on the Newton-Raphson method. One design problem, available in the literature, is solved by this program to provide possible design procedures. A listing of the computer program is given in the Appendix.
Dario J Aristizabalochoa - One of the best experts on this subject based on the ideXlab platform.
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rigid spread footings resting on soil subjected to Axial Load and biAxial bending ii design aids
International Journal of Geomechanics, 2013Co-Authors: J A Rodriguezgutierrez, Dario J AristizabalochoaAbstract:AbstractDesign aids (nomograms) for rectangular and symmetrical trapezoidal rigid spread footings are developed using a method previously developed by the writers in a companion paper. The nomograms can be used by designers to directly determine their maximum Axial Load and biAxial moment capacities without exceeding the bearing capacity of the supporting soil. Three different types of pressure distribution at the soil-footing interface are considered: uniform, linear, and parabolic. The results obtained can then be compared with the biAxial moment-Axial Load interaction diagrams of the attached concrete walls or columns. This allows the structural designer to determine the vulnerability and likelihood of exceeding the bearing capacity of the supporting soil. Four examples are presented that show the effectiveness and simplicity of the proposed nomograms in the analysis of isolated rectangular and trapezoidal rigid spread footings resting on soil.
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m p f diagrams for reinforced p artially and fully prestressed concrete sections under biAxial bending and Axial Load
Journal of Structural Engineering-asce, 2001Co-Authors: J A Rodriguezgutierrez, Dario J AristizabalochoaAbstract:An analytical model that determines the M-P-f diagrams including the inelastic structural re- sponse, ultimate strength, and failure mode of reinforced concrete, partially prestressed concrete, and fully prestressed concrete sections of any cross shape under combined biAxial bending and Axial Load is presented. The proposed method uses (1) a nonlinear stress-strain relationship for the concrete; (2) a multilinear elastic- plastic relationship for the conventional reinforcement; (3) a modified Ramberg-Osgood function for the pre- stressed steel; and (4) Gauss's integral method for equilibrium at the sectional level. The proposed method can be utilized to study the effects of creep, confinement, and tension-stiffening of the concrete and relaxation of the prestressed steel on the behavior, strength, ductility, and failure mode of reinforced concrete, partially pre- stressed concrete, and fully prestressed concrete sections under biAxial bending and Axial Load. The biAxial bending behavior, ultimate strength, failure mode, and M-P-f diagrams of any concrete section can be obtained using a minicomputer, and as expected, they depend on (1) cross-sectional characteristics and reinforcement layout; (2) the constitutive stress-strain characteristics of the concrete and reinforcements; and (3) the type and intensity of applied Loads. Two numerical examples are presented in detail to verify and show the effectiveness of the proposed method.
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reinforced partially and fully prestressed slender concrete columns under biAxial bending and Axial Load
Journal of Structural Engineering-asce, 2001Co-Authors: J A Rodriguezgutierrez, Dario J AristizabalochoaAbstract:An analytical model that determines the inelastic structural response, ultimate strength, and failure mode of reinforced concrete, partially prestressed concrete, and prestressed concrete slender columns of any cross section under biAxial bending and Axial Load is presented. The effects of rotational and lateral restraints at the ends are included, but the effects of shear deformations and torsional moments along the member are neglected. The proposed method uses (1) a nonlinear stress-strain relationship for the concrete; (2) a multilinear elastic-plastic relationship for the conventional reinforcement; (3) a modified Ramberg-Osgood function for the prestressed steel; (4) Gauss's integral method for equilibrium at the sectional level to generate the moment-Axial Load-curvature characteristics (i.e., M-P-ϕ diagrams) along the member; and (5) the finite-element method to evaluate the transverse deflections and second-order moments (P-δ and P-Δ effects) along the member. The proposed method can be utilized ...
