Riyad S. Aboutaha's research while affiliated with Syracuse University and other places
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Publications (29)
This paper presents the cyclic flexural performance of reinforced
concrete (RC) beams after being exposed to a fire for 3 hours,
air-cooled, and then strengthened with partial-length, adhesive-bonded
carbon fiber-reinforced polymer (CFRP) plates. A total
of 15 T-beams were tested under static four-point bending with
periodic unloading and reloading...
In this research, a single-shear test was conducted to investigate the bond properties between carbon fibre-reinforced polymer (CFRP) plates and fire-damaged concrete prisms. The investigation focused on the effects of fire exposure condition and the presence of internal steel reinforcements on the effective bond l...
This paper presents the effect of sustained service loading at elevated temperatures on the residual flexural response of reinforced concrete (RC) T-beams after exposed to elevated temperatures of 700 and 900°C (1292 and 1652°F) for 3 hours and then cooled in air. Two beams were subjected to a constant simulated service loading equal to 22.6% of un...
Finite-element analysis (FEA) and an analytical model were used to estimate the ultimate flexural strength of reinforced concrete (RC) beams with corroded compression bars. Both models accounted for the deteriorated material's properties and geometry. The two models were verified against available experimental data and both showed good agreement. T...
Although reinforced concrete (RC) members exhibit high fire resistance characteristics, their structural behavior can significantly deteriorate when exposed to a prolonged moderate to severe fire. This paper presents the thermal and deflection responses of simply-supported RC T-beams at elevated temperatures. A total of seven RC beams of identical...
Load rating analysis of bridge live load capacity is the main technique in evaluating existing bridges in the United States. Load ratings are performed on a bridge following a detailed visual inspection mainly based on engineering experience. With the absence of an analytical evaluation procedure to determine the ultimate flexural strength of bridg...
Corrosion of reinforcing steel bars is the primary durability problem that causes degradation of
reinforced concrete structures located in aggressive environments. Severe corrosion of steel bars
decreases the load-carrying capacity of reinforced concrete members, causes bond deterioration,
reduces anchorage of steel bars, and decreases the confinem...
In order to develop a cost-effective retrofit system for deteriorated concrete members, there is a need for sound evaluation of their remaining strength. Unfortunately, there is a lack of reliable models for evaluating the residual strength of steel reinforced concrete beams, and further, there is no simplified analytical model that can reasonably...
In this paper, in order to understand fully the hysteretic behavior of carbon fiber reinforced concrete column under low frequency cyclic loads and provide a reference for the application of practical engineering, 3 test specimens have been investigated. Concrete strength grade is C30 and the volume fraction of carbon fiber is 2‰. Then we can get t...
The failure of one structural element may lead to the failure of the other structural components where ultimately result in the collapse of the large sections or the entire structure. The progressive collapse of the structures have been mainly investigated for buildings. However, cable failure in cable-stayed bridges may cause catastrophic conseque...
In this study, nominal moment-axial load interaction diagrams, moment-curvature relationships, and ductility of rectangular hybrid beam-column concrete sections are analyzed using the modified Hognestad concrete model. The hybrid columns are primarily reinforced with steel bars with additional Glass Fiber Reinforced Polymer (GFRP) control bars. Par...
Corrosion is the primary limit state in steel reinforced concrete (RC) beams in severe environments. Corrosion of steel bars causes a decrease in steel bar section, loss of bond, and delamination of concrete cover Very limited models have been developed for estimating the residual flexural strength of corroded RC beam. These models do not different...
![Figure 1. Failure mode classification [5]](profile/Sara-Sotoud/publication/281574184/figure/fig1/AS:284492221698051@1444839639674/Failure-mode-classification-5_Q320.jpg)
Old existing reinforced concrete bridge columns that had been designed before the
development of new seismic codes are at risk of damage due to lateral loading. For an ideally
designed concrete column subjected to lateral load, mode of failure is flexural. However,
even if most of the inelastic action is flexural, lack of transverse reinforcement w...
In this paper, the finite element analysis software ABAQUS is used to study the seismic performance of the joint of crisscross concrete-filled steel tube core column-steel beam tested by the pseudo static simulation under low cyclic loading. Then we can get the load-displacement curves of the joint when the axial compressive ratios are 0.2~0.9. By...
Composite concrete filled steel tubular (CFST) column is a new type of column having high ductility and high load-bearing capacity. In this paper, the finite element analysis software ABAQUS is used to study the seismic performance of 3D joint of composite CFST column and steel beam. The hysteretic curve and skeleton curve are obtained by changing...
In order to increase the load carrying capacity and/or increase the service life of existing circular reinforced concrete bridge columns, Carbon Fiber Reinforced Polymer (CFRP) composites could be utilized. Transverse wrapping of circular concrete columns with CFRP sheets increases its axial and shear strengths. In addition, it provides good confin...
Reinforced concrete (RC) bridge columns with inadequate lap splices in the longitudinal reinforcement are very vulnerable. They are even more critical in corrosive environments. Corrosion of steel bars decreases the steel section, reduces ductility, and deteriorates the bond between the steel reinforcing bars and the surrounding concrete. The base...
Reinforced concrete (RC) bridge columns with inadequate lap splices in the longitudinal reinforcement are very vulnerable to seismic events. They are even more critical in corrosive environments. Corrosion of steel bars decreases the steel section, reduces ductility, and deteriorates the bond between the steel reinforcing bars and the surrounding c...
This paper presents results from an analytical investigation of the behavior of steel reinforced concrete circular column sections with additional Glass Fiber Reinforced Polymers (GFRP) bars. The primary application of this composite section is to relocate the plastic hinge region from the column-footing joint where repair is difficult and expensiv...
This paper investigates the parameters that control the design of Fiber Reinforced Polymer (FRP) reinforced concrete flexural members proportioned following the ACI 440.1R-06. It investigates the critical parameters that control the flexural design, such as the deflection limits, crack limits, flexural capacity, concrete compressive strength, beam...
In this paper, the effect of reinforcement corrosion and loss of concrete cover on structural behavior of bridge columns is quantified by developing moment–axial load (M–P) interaction diagrams using modified analysis procedure and advanced deteriorated material models. The results of this study suggest that corrosion of steel bars on the compressi...
This paper presents a new approach that incorporates the effects of temperature, design life, and relative humidity (RH) of exposure into the environmental reduction factor (RF) for glass fiber reinforced polymer (GFRP) bars used as concrete reinforcement. The environmental RFs for GFRP bars that are adopted in various guidelines are presented and...
This paper presents a new methodology to evaluate the load carrying capacity of deteriorated non-slender concrete bridge pier columns by construction of the full P-M interaction diagrams. The proposed method incorporates the actual material properties of deteriorated columns, and accounts for amount of corrosion and exposed corroded bar length, con...
In recent years, a great deal of research on the carbon fiber-reinforced polymer (CFRP) composite retrofitted systems has been done. The investigation of CFRP retrofit systems, however, has focused on flexural and shear strengthening for slender concrete members. Very limited work has been done on CFRP strengthened deep concrete structures. For ana...
Condition-rating methods followed by load rating calculations are used for evaluating existing bridges in the United States. Ratings are assessed visually based on engineering expertise and experience, and in some cases supplemented by nondestructive tests. Good understanding of the effects of deterioration on the structural performance leads to be...
This paper presents investigation of a three-dimensional (3-D) nonlinear finite element model analysis to examine the behavior of reinforced concrete beams strengthened with Carbon Fiber Reinforced Polymer (CFRP) composites to enhance the flexural capacity and ductility of the beams. Three-dimensional nonlinear finite element models were developed...
Strength of reinforced concrete beams can easily be increased by the use of externally bonded CFRP composites. However, the mode of failure of CFRP strengthened beam is usually brittle due to tension-shear failure in the concrete substrate or bond failure near the CFRP-Concrete interface. In order to improve the ductility of CFRP strengthened concr...
Citations
... FRP reinforcement has a higher tensile strength compared to steel rebars. A number of research works indicated that the beams with FRP reinforcement had a higher load-carrying capacity than the those with conventional steel reinforcing bars [5,[14][15][16][17]. ...
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... FRP reinforcement has a higher tensile strength compared to steel rebars. A number of research works indicated that the beams with FRP reinforcement had a higher load-carrying capacity than the those with conventional steel reinforcing bars [5,[14][15][16][17]. ...
... Therefore, it is extremely important to focus on the fire resistance of a building structure as its structural integrity might be the last line of defense, as stated in the works of [19,[22][23][24][25][26][27]. Fire resistance is a critical factor in the design and construction of buildings and structures. ...
... Constructing RC structures in corrosive mediums without considering corrosion susceptibility can lead to detrimental effects on the elements' reinforcement, concrete surface, and bond strength with steel bars, which subsequently degrade the bending capacity of the members [4][5][6]. Particularly, corrosion decreases the cross-sectional area of the rebars, thereby affecting the overall structural performance of the buildings [4]. In addition, corrosion products expand the volume of reinforcement and therefore crack and spall of the concrete cover and, in turn, reduce the effective height and cross-sectional reinforcement area of the RC members [5]. ...
... Although the current design guidelines lack specific suggestions on how to deal with different security-related risks, designers need to ensure that the risk assessment level is enough. Ataei et al. [7] adopted the nonlinear finite element modeling and analysis method to study the influence of hypothetical fire and temperature gradient propagation along a cable and studied the influence of fire intensity and fire duration on cable strength loss by using the finite element method. ...
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... Several researchers carried out studies on the flexural performance of reinforced concrete beams with hybrid FRP-steel reinforcement over the last 20 years [1,2]. With the increasing use of FRP in reinforced concrete construction, the number of studies investigating this hybrid reinforcement is also increasing [1,2,[6][7][8][9][10][11][12][13][14][15][16][17][18]. Some research results related to these studies are described below. ...
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... The shear span to depth ratio above the jacket for specimens with h/4 and h/2 jackets is 8.25 and 5.5, respectively. When the shear span to depth ratio decreases, the lateral strength and stiffness increase [45,46]. In fact, as the shear span to depth ratio of RC columns decreases, the arch (strut) action increases and additional shear loads are transmitted to the support by arch action through the compressive strut rather than flexure [47]. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/339965218181129-1458065432238_Q64/Sara-Sotoud.jpg)
... The energy dissipation capacity of structural members determines the seismic capacity of the structure. The energy dissipation capacity of the join model is mainly evaluated by the equivalent viscous damping coefficient [19].Usually, the average of the reinforced concrete joint is 0.1, and the common steel concrete joint is about 0.3 [20]. Table 4 shows the equivalent viscous damping coefficient corresponding to the hysteresis curve of each finite element model. ...
... For an unbonded beam, large rotations can be achieved while the tendon has a relatively low strain over its entire length because the strain increase in the tendon due to the displacement could be distributed uniformly along the length of the tendon [16]. An analytical model proposed by Jnaid et al. (2014) for estimating the residual capacity of beams with unbonded bars showed that the inherent bearing capacity can be maintained with an unbonded length of less than 50 % of the span length [20]. An analytical model based on the curvature approach was developed by Choi to predict the performance of partially bonded FRP beams. ...
... Concrete structures are exposed to damage as a result of 1) natural disasters such as earthquakes or hurricanes, 2) exposure to impact loads such as explosions, 3) change in the function of the original structure, 4) errors that occur during the design process, and 5) setbacks or errors in the construction process such as shortage in rebar or other structural materials. All of the above prevent the structure from functioning in the anticipated manner [1,2]. One of the earliest methods used in repair and rehabilitation consists of steel plates bonded to reinforced concrete using screws [3]. ...
