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Papers by Raad Abdulkhudhur

AIP conference proceedings, 2024

Innovative Infrastructure Solutions

IOP Conference Series: Materials Science and Engineering, 2020

In modern structural constructions and high rise buildings, the one of the most important conside... more In modern structural constructions and high rise buildings, the one of the most important consideration is the efficient design of long span floor composite system and girder beams with web opening. For minimizing the cross sectional of these members, reducing the dead load and cost wise of construction steel beams, web openings are necessary and the floor beams acts compositely with slabs. This study is focused on the performance of floor steel beam with circular web perforation subjected to line loading and on the evaluation of shear buckling capacity for such beams under the effects of static and dynamic loadings. The adopted parameters are web to thickness ratio and web perforation size. Numerical analysis method as finite elements approach by ANSYS software is taken to simulate all models and presented as three dimensional problems. The analysis results indicate that the presence of web perforations reduced the shear strength capacity and increased the deflection, and the configuration of tension field were changed. In case of dynamic loadings, the study showed that the magnitude of deflections is effected by the frequency of the applied external load and varied with respect to the magnitude of the frequency.

IOP Conference Series: Materials Science and Engineering, 2021

The shear strength of concrete beams manufactured from a mix including fine pieces of waste tire ... more The shear strength of concrete beams manufactured from a mix including fine pieces of waste tire rubber (rubberised concrete) have been studied in several experimental programmes, with results showing a reduction in shear strength when using rubberised concrete instead of conventional concrete. In much of the recent research in this area. The main goal of the current investigation was thus to determine the extent of such reduction and to find ways to compensate for this reduction by the addition of steel fibre. A total of eight rubberised concrete beams of (140 mm width, 240 mm height, and 1240 mm length) were tested experimentally with replacement ratios by volume fraction of coarse and fine aggregate volume with fine tire waste of 0%, 25%, and 50% investigated. Additions of, 0%, 0.5% and 1.5% steel fibre content were also made to the rubberised concretes, in an attempt to test improvements in the resulting shear strength. A four-points load testing configuration was used for testi...

International Review of Civil Engineering (IRECE), 2021

IOP Conference Series: Materials Science and Engineering, 2020

In structural concrete members that have geometrical discontinuities, the type of failure is call... more In structural concrete members that have geometrical discontinuities, the type of failure is called direct shear failure when there is no; the same member may change its response when the load arrangement is changed. This kind of failure is related to the cracks along the plane where the loaded member slides along the stationary support system and cracks are perpendicular to the axis of the member. Numerical analysis on push-off specimens were conducted in this study to investigate the shear strength in reactive powder concrete, which has cementitious compositions. The validation of the material and geometrical model to check the efficiency of the constitutive model to simulate the behavior of shear strength of RPC was achieved through comparison with the experimental result of previous work. The effects of volume fraction, aspect ratio, shape of steel fibers on the shear strength were considered to be the variables of the study. The data analyzed showed that the increase in volume ...

Civil Engineering Journal, 2019

Compression splices are widely used in compression members such as columns in multi- story buildi... more Compression splices are widely used in compression members such as columns in multi- story buildings. There are efficient design equations for compression splice of reinforcement embedded in conventional concrete proposed by design codes of practice. However, there is no design equation for compression splice in compression members made of reactive powder concrete (RPC). So, it is required to introduce a design equation to calculate the steel bars lap splice length of RPC compression members. In this study, an experimental work was conducted to investigate the effect of different variables on compression splices strength. These variables were compressive strength of concrete, transverse reinforcement amount, splice length, yield stress of reinforcement and spliced rebar diameter. The experimental results showed that; Increase in the yield stress of reinforcing bars, length of spliced bars and compressive strength of concrete result in increasing in splice strength. Meanwhile, increa...

Structures, 2019

Reactive Powder Concrete (RPC) is an emerging cementations construction material which has superi... more Reactive Powder Concrete (RPC) is an emerging cementations construction material which has superior mechanical properties such as high compressive and tensile strength, high density and homogeneous. In this research, the tension splice behaviour of reinforcement bars embedded in RPC was investigated using experimental and numerical studies. Six reinforced RPC beams with four-point loading were tested. The parameters investigated in the experimental program were steel fibre contents, size of reinforcing bar, tension reinforcement splice length, and amount of transverse reinforcement. The experimental findings showed that the increasing of steel fibre content, amount of transverse reinforcement, length of spliced bars, and diameter of spliced bars increased the tension splice strength of steel bras embedded in RPC members. Splitting of concrete is the dominate mode of failure that occurred in RPC beams spliced with tension reinforcement. Finite element method was used in this study to simulate the behaviour of members tested experimentally and a comparison between experimental and numerical results were conducted. The comparisons showed a good agreement between experimental results and numerical results in terms of load deflection curves and splice strengths. The verified finite element model was used then to study the effect of wide range of data for variables affect the splice strength using a parametric study. A proposed design equation of splice strength of tension reinforcing bars embedded in RPC was proposed in this study and verified with numerical results.

Journal of Engineering and Technological Sciences, 2021

This study investigated the bond strength behavior of a deformed steel bar embedded in RAC throug... more This study investigated the bond strength behavior of a deformed steel bar embedded in RAC through an experimental program and numerical analysis. In the experimental work, eighteen push-out specimens were tested. The compressive strength of RAC, the recycled aggregate replacement ratio, the embedded length of the reinforcing bar, the size of the rebar, the concrete cover, and the yield stress of the reinforcing steel bar were the main parameters investigated. The effect of these parameters on bond strength, bond-slip behavior, and modes of failure are discussed. Analysis of the test results indicate that the bond strength in concrete is reduced by 13% when using a specimen constructed from recycled aggregate compared with conventional concrete. The failure modes in a reinforcing bar embedded in RAC representing splitting failure and push-out failure, were similar to those in conventional concrete. The finite element analysis presented in this study was used to analyze forty-four pu...

AIP conference proceedings, 2024

Innovative Infrastructure Solutions

IOP Conference Series: Materials Science and Engineering, 2020

In modern structural constructions and high rise buildings, the one of the most important conside... more In modern structural constructions and high rise buildings, the one of the most important consideration is the efficient design of long span floor composite system and girder beams with web opening. For minimizing the cross sectional of these members, reducing the dead load and cost wise of construction steel beams, web openings are necessary and the floor beams acts compositely with slabs. This study is focused on the performance of floor steel beam with circular web perforation subjected to line loading and on the evaluation of shear buckling capacity for such beams under the effects of static and dynamic loadings. The adopted parameters are web to thickness ratio and web perforation size. Numerical analysis method as finite elements approach by ANSYS software is taken to simulate all models and presented as three dimensional problems. The analysis results indicate that the presence of web perforations reduced the shear strength capacity and increased the deflection, and the configuration of tension field were changed. In case of dynamic loadings, the study showed that the magnitude of deflections is effected by the frequency of the applied external load and varied with respect to the magnitude of the frequency.

IOP Conference Series: Materials Science and Engineering, 2021

The shear strength of concrete beams manufactured from a mix including fine pieces of waste tire ... more The shear strength of concrete beams manufactured from a mix including fine pieces of waste tire rubber (rubberised concrete) have been studied in several experimental programmes, with results showing a reduction in shear strength when using rubberised concrete instead of conventional concrete. In much of the recent research in this area. The main goal of the current investigation was thus to determine the extent of such reduction and to find ways to compensate for this reduction by the addition of steel fibre. A total of eight rubberised concrete beams of (140 mm width, 240 mm height, and 1240 mm length) were tested experimentally with replacement ratios by volume fraction of coarse and fine aggregate volume with fine tire waste of 0%, 25%, and 50% investigated. Additions of, 0%, 0.5% and 1.5% steel fibre content were also made to the rubberised concretes, in an attempt to test improvements in the resulting shear strength. A four-points load testing configuration was used for testi...

International Review of Civil Engineering (IRECE), 2021

IOP Conference Series: Materials Science and Engineering, 2020

In structural concrete members that have geometrical discontinuities, the type of failure is call... more In structural concrete members that have geometrical discontinuities, the type of failure is called direct shear failure when there is no; the same member may change its response when the load arrangement is changed. This kind of failure is related to the cracks along the plane where the loaded member slides along the stationary support system and cracks are perpendicular to the axis of the member. Numerical analysis on push-off specimens were conducted in this study to investigate the shear strength in reactive powder concrete, which has cementitious compositions. The validation of the material and geometrical model to check the efficiency of the constitutive model to simulate the behavior of shear strength of RPC was achieved through comparison with the experimental result of previous work. The effects of volume fraction, aspect ratio, shape of steel fibers on the shear strength were considered to be the variables of the study. The data analyzed showed that the increase in volume ...

Civil Engineering Journal, 2019

Compression splices are widely used in compression members such as columns in multi- story buildi... more Compression splices are widely used in compression members such as columns in multi- story buildings. There are efficient design equations for compression splice of reinforcement embedded in conventional concrete proposed by design codes of practice. However, there is no design equation for compression splice in compression members made of reactive powder concrete (RPC). So, it is required to introduce a design equation to calculate the steel bars lap splice length of RPC compression members. In this study, an experimental work was conducted to investigate the effect of different variables on compression splices strength. These variables were compressive strength of concrete, transverse reinforcement amount, splice length, yield stress of reinforcement and spliced rebar diameter. The experimental results showed that; Increase in the yield stress of reinforcing bars, length of spliced bars and compressive strength of concrete result in increasing in splice strength. Meanwhile, increa...

Structures, 2019

Reactive Powder Concrete (RPC) is an emerging cementations construction material which has superi... more Reactive Powder Concrete (RPC) is an emerging cementations construction material which has superior mechanical properties such as high compressive and tensile strength, high density and homogeneous. In this research, the tension splice behaviour of reinforcement bars embedded in RPC was investigated using experimental and numerical studies. Six reinforced RPC beams with four-point loading were tested. The parameters investigated in the experimental program were steel fibre contents, size of reinforcing bar, tension reinforcement splice length, and amount of transverse reinforcement. The experimental findings showed that the increasing of steel fibre content, amount of transverse reinforcement, length of spliced bars, and diameter of spliced bars increased the tension splice strength of steel bras embedded in RPC members. Splitting of concrete is the dominate mode of failure that occurred in RPC beams spliced with tension reinforcement. Finite element method was used in this study to simulate the behaviour of members tested experimentally and a comparison between experimental and numerical results were conducted. The comparisons showed a good agreement between experimental results and numerical results in terms of load deflection curves and splice strengths. The verified finite element model was used then to study the effect of wide range of data for variables affect the splice strength using a parametric study. A proposed design equation of splice strength of tension reinforcing bars embedded in RPC was proposed in this study and verified with numerical results.

Journal of Engineering and Technological Sciences, 2021

This study investigated the bond strength behavior of a deformed steel bar embedded in RAC throug... more This study investigated the bond strength behavior of a deformed steel bar embedded in RAC through an experimental program and numerical analysis. In the experimental work, eighteen push-out specimens were tested. The compressive strength of RAC, the recycled aggregate replacement ratio, the embedded length of the reinforcing bar, the size of the rebar, the concrete cover, and the yield stress of the reinforcing steel bar were the main parameters investigated. The effect of these parameters on bond strength, bond-slip behavior, and modes of failure are discussed. Analysis of the test results indicate that the bond strength in concrete is reduced by 13% when using a specimen constructed from recycled aggregate compared with conventional concrete. The failure modes in a reinforcing bar embedded in RAC representing splitting failure and push-out failure, were similar to those in conventional concrete. The finite element analysis presented in this study was used to analyze forty-four pu...