scholarly journals GFRP Bars Anchorage Resistance in a GFRP-Reinforced Concrete Bridge Barrier

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2485
Author(s):  
Michael Rostami ◽  
Khaled Sennah ◽  
Saman Hedjazi
Keyword(s):  
Bending Moment ◽  
Cost Effective ◽  
Transverse Load ◽  
Small Radius ◽  
Experimental Program ◽  
Concrete Bridge ◽  
Gfrp Bars ◽  
State Highway ◽  
Glass Fiber Reinforced ◽  
Experimental Findings

In the present paper, experimental and numerical investigations were conducted on concrete bridge barriers utilizing glass fiber reinforced polymer (GFRP) bars with a hook at their ends. Implementation of these hooked bars instead of the bent bars or headed-end bars in the bridge barriers presented in the Canadian Highway Bridge Design Code (CHBDC) was investigated on American Association for State Highway and Transportation Officials (AASHTO) test level 5 (TL-5) concrete bridge barriers. This research aimed to reach a cost effective and safe anchorage method for GFRP bars at the barrier–deck junction, compared to the conventional bend bars or headed-end bars. Therefore, an experimental program was developed and performed to qualify the use of the recently-developed, small radius hooked bars at the barrier–deck junction. The experimental findings were compared with the design factored applied transverse load specified in CHBDC for the design of the barrier–deck junction as well as factored applied bending moment obtained at the barrier–deck junction using a recently-conducted finite-element modeling. Satisfactory behavior for the developed hooked GFRP bars as well as their anchorage resistance was established and a reasonable factor of safety in design of barrier–deck joint was achieved.

scholarly journals Investigation on the capacity of TL-5 GFRP-reinforced concrete bridge barrier-deck anchorage subjected to transverse vehicle impact loading

2021 ◽  
Author(s):  
Gledis Dervishhasani
Keyword(s):  
Epoxy Adhesive ◽  
Experimental Program ◽  
Concrete Bridge ◽  
Pullout Capacity ◽  
Gfrp Bars ◽  
Gfrp Bar ◽  
Normal Strength ◽  
Experimental Findings ◽  
Barrier Wall ◽  
Deck Slab

A new Ontario-based glass fiber reinforced polymer (GFRP) bar manufacturer developed high-modulus (HM) GFRP bars with headed ends for use in bridge construction. This thesis presents a structural qualification procedure to qualify the use of the developed GFRP bars in concrete bridge barriers-deck joint. The thesis is comprised of two phases. The first phase includes an experimental program to investigate the pullout capacity of the GFRP bar anchorage in normal strength concrete. In phase two, three sets of full-scale TL-5 barrier wall-deck system of 900 mm length were cast and tested to-collapse. The first set incorporated headed-end GFRP bars to connect the barrier wall to a deck slab cantilever for better pre-installed anchorage. The second set is identical to the first set but for non-deformable thick deck slab. The third set incorporated post-installed GFRP bars in non-deformable thick deck slab using a commercial epoxy adhesive. Experimental capacities of the tested specimen were then correlated with factored applied moments given by the 2006 Commentaries of the Canadian Highway Bridge Design Code and available equations in the literature. Based on the experimental findings, conclusions and recommendations were drawn.

scholarly journals Investigation on the capacity of TL-5 GFRP-reinforced concrete bridge barrier-deck anchorage subjected to transverse vehicle impact loading

2021 ◽  
Author(s):  
Gledis Dervishhasani
Keyword(s):  
Epoxy Adhesive ◽  
Experimental Program ◽  
Concrete Bridge ◽  
Pullout Capacity ◽  
Gfrp Bars ◽  
Gfrp Bar ◽  
Normal Strength ◽  
Experimental Findings ◽  
Barrier Wall ◽  
Deck Slab

A new Ontario-based glass fiber reinforced polymer (GFRP) bar manufacturer developed high-modulus (HM) GFRP bars with headed ends for use in bridge construction. This thesis presents a structural qualification procedure to qualify the use of the developed GFRP bars in concrete bridge barriers-deck joint. The thesis is comprised of two phases. The first phase includes an experimental program to investigate the pullout capacity of the GFRP bar anchorage in normal strength concrete. In phase two, three sets of full-scale TL-5 barrier wall-deck system of 900 mm length were cast and tested to-collapse. The first set incorporated headed-end GFRP bars to connect the barrier wall to a deck slab cantilever for better pre-installed anchorage. The second set is identical to the first set but for non-deformable thick deck slab. The third set incorporated post-installed GFRP bars in non-deformable thick deck slab using a commercial epoxy adhesive. Experimental capacities of the tested specimen were then correlated with factored applied moments given by the 2006 Commentaries of the Canadian Highway Bridge Design Code and available equations in the literature. Based on the experimental findings, conclusions and recommendations were drawn.

scholarly journals Flexure strength prediction of closure strip between prefabricated deck slabs supported over bridge girders incorporating CFRP bars and UHPFRC

2021 ◽  
Author(s):  
Mohtady Moataz Sherif
Keyword(s):  
High Performance ◽  
Design Guidelines ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Gfrp Bars ◽  
Deck Panels ◽  
Girder Bridges ◽  
Glass Fiber Reinforced ◽  
High Performance Fiber ◽  
Experimental Findings

Glass fiber reinforced polymer (GFRP) bars are used in bridge decks to overcome the problem of corrosion of steel bars and concrete spalling. However, design guidelines for joints between GFRPreinforced precast deck panels supported over girders for accelerated bridge replacement is as yet unavailable. The proposed research investigates the use of GFRP bars in the closure strip between jointed precast deck panels, which is filled with ultra-high performance fiber-reinforced concrete (UHPFRC). Four different bar splice lengths in the joint were considered in this study, namely: 75, 105, 135 and 165 mm, with bar splice spacing taken as 0, 75 and 100 mm. 27 specimens were constructed and tested to-collapse to determine their structural behavior and load carrying capacity. Correlation between experimental findings and available design equations for moment and shear capacities was conducted, leading to recommendations for the use of the proposed joints between precast deck panels in slab-on-girder bridges.

Development of cost-effective PL-3 concrete bridge barrier reinforced with sand-coated glass fibre reinforced polymer (GFRP) bars: static load tests

2014 ◽  
Vol 41 (4) ◽  
pp. 368-379 ◽  
Author(s):  
H. Khederzadeh ◽  
K. Sennah
Keyword(s):  
Carrying Capacity ◽  
Shear Failure ◽  
Ultimate Load ◽  
Cost Effective ◽  
Punching Shear ◽  
Transverse Load ◽  
Load Carrying Capacity ◽  
Gfrp Bars ◽  
Load Carrying ◽  
Ultimate Load Carrying Capacity

One of the main factors concerning durability and service life of steel-reinforced bridges is corrosion of steel bars especially when exposed to a harsh environment. The use of glass fibre reinforcing polymer (GFRP) bars as non-corrosive material has emerged as an innovative solution to corrosion related problems, reduce the maintenance cost, and increase the service life of bridge structures. A recent cost-effective design of PL-3 bridge barrier was developed at Ryerson University incorporating high-modulus GFRP bars with headed ends. This paper presents results of full-scale static tests to collapse performed on the developed PL-3 bridge barrier at interior and exterior locations to investigate the ultimate load carrying capacity to be compared with Canadian Highway Bridge Design Code (CHBDC). The experimental ultimate load carrying capacity of the barriers was observed to be far greater than CHBDC factored design transverse load. The failure pattern was initiated by a trapezoidal crack pattern at the front face of the barrier, followed by punching shear failure at the transverse load location. Based on the punching shear failure developed in the barrier wall and comparison with available punching shear equations in the literature, an empirical punching shear equation is proposed to determine the transverse load carrying capacity of PL-3 bridge barrier walls reinforced with GFRP bars.

scholarly journals Flexure strength prediction of closure strip between prefabricated deck slabs supported over bridge girders incorporating CFRP bars and UHPFRC

2021 ◽  
Author(s):  
Mohtady Moataz Sherif
Keyword(s):  
High Performance ◽  
Design Guidelines ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Gfrp Bars ◽  
Deck Panels ◽  
Girder Bridges ◽  
Glass Fiber Reinforced ◽  
High Performance Fiber ◽  
Experimental Findings

Glass fiber reinforced polymer (GFRP) bars are used in bridge decks to overcome the problem of corrosion of steel bars and concrete spalling. However, design guidelines for joints between GFRPreinforced precast deck panels supported over girders for accelerated bridge replacement is as yet unavailable. The proposed research investigates the use of GFRP bars in the closure strip between jointed precast deck panels, which is filled with ultra-high performance fiber-reinforced concrete (UHPFRC). Four different bar splice lengths in the joint were considered in this study, namely: 75, 105, 135 and 165 mm, with bar splice spacing taken as 0, 75 and 100 mm. 27 specimens were constructed and tested to-collapse to determine their structural behavior and load carrying capacity. Correlation between experimental findings and available design equations for moment and shear capacities was conducted, leading to recommendations for the use of the proposed joints between precast deck panels in slab-on-girder bridges.

scholarly journals Beam Bond Tests of GFRP and Steel Reinforcement to Concrete

2018 ◽  
Vol 64 (4) ◽  
pp. 243-256
Author(s):  
D. Szczech ◽  
R. Kotynia
Keyword(s):  
Reinforced Concrete ◽  
Surface Preparation ◽  
Steel Reinforcement ◽  
Experimental Program ◽  
Bond Behaviour ◽  
Gfrp Bars ◽  
Concrete Members ◽  
Glass Fiber Reinforced ◽  
Steel Bars ◽  
Frp Bars

AbstractThe paper presents research program of bond between glass fiber reinforced polymer bars and concrete in reference to the steel bars. Bond between the reinforcement and concrete is a crucial parameter governing a behaviour of reinforced concrete members and transferring of the internal forces from concrete to the reinforcement. The use of FRP bars as an equivalent reinforcement to steel in concrete structures has increased in recent years. The FRP bars are very different from steel, mainly due to much lower elasticity modulus and their anisotropic structure. Good performance of FRP reinforced concrete requires sufficient interfacial bond between bars and concrete. However, there are no specific standards referring to the surface preparation of these bars, that leads to variable bond behaviour of the composite reinforcement to the concrete. The objective of the study was to investigate the influence of variable parameters on the bond behaviour to concrete. The experimental program consisted of eighteen beam bond specimens varying in: bar diameter (12mm, 16mm, 18mm) and type of reinforcement (GFRP sand – coated and steel bars). Although the GFRP bars indicated good bond behaviour to concrete, the average bond strength was slightly lower than that of steel reinforcement of 16mm and 18 mm, while it was higher for the GFRP bars of 12mm diameter.

Effect of ethanol on the mold filling-time and mechanical properties of woven glass fiber reinforced epoxy filled with TiO2 nanoparticles

2020 ◽  
pp. 152808372097134
Author(s):  
Sherif M Youssef ◽  
M Megahed ◽  
Soliman S Ali-Eldin ◽  
MA Agwa
Keyword(s):  
Mechanical Properties ◽  
Composite Laminates ◽  
Cost Effective ◽  
Mold Filling ◽  
High Viscosity ◽  
Ansys Fluent ◽  
Glass Fiber Reinforced ◽  
Filling Time ◽  
Ethanol Addition ◽  
Woven Glass Fiber

Vacuum resin infusion (VRI) is a promising technique for manufacturing complicated structural laminates. This high viscosity of nanofilled resin increases the filling time and leads to an incomplete mold filling. The mold filling time can be reduced either by making the fiber dimensions smaller than the mold (gaps around the fibers) or by adding ethanol to nanofilled epoxy. However, ethanol addition influences the mechanical properties of composite laminates. In this study, different amounts of ethanol (0.5 wt. % and 1 wt. %) were used as a diluent to both neat epoxy and epoxy filled with (0.25 wt. %) of titanium dioxide (TiO2) nanoparticles. From results, it was found that ethanol addition saves the time for neat and nanofilled epoxy by 47.1% and 24.1%, respectively. It was found that adding 0.5 wt. % of ethanol to 0.25wt. % of TiO2 nanoparticles (GT0.25E0.5) enhances the tensile and flexural strength by 30.8% and 55.9%, respectively compared with neat specimens. Furthermore, the tensile and flexural moduli increased by 62% and 72.3%, respectively. Furthermore, the mold filling time was investigated experimentally and validated numerically using ANSYS FLUENT software. The mold filling time prediction using ANSYS FLUENT can be used to avoid resin gelation before the incomplete mold filling and thus can be considered a cost-effective methodology. The results showed that the gaps around the fibers reduce the time by 178% without affecting the mechanical properties.

scholarly journals On the Structural Performance of Recycled Aggregate Concrete Columns with Glass Fiber-Reinforced Composite Bars and Hoops

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1508
Author(s):  
Ali Raza ◽  
Ahmad Rashedi ◽  
Umer Rafique ◽  
Nazia Hossain ◽  
Banjo Akinyemi ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Compressive Loading ◽  
Reinforcement Ratio ◽  
Recycled Aggregate Concrete ◽  
Experimental Results ◽  
Recycled Aggregate ◽  
Fiber Reinforced ◽  
Aggregate Concrete ◽  
Gfrp Bars ◽  
Glass Fiber Reinforced

Structural members comprising geopolymer recycled aggregate concrete (RAC) reinforced with glass fiber-reinforced polymer (GFRP) bars have not been investigated appropriately for axial compressive loading cases. The present study addresses this knowledge gap by evaluating the structural efficiency of GFRP-reinforced geopolymer recycled aggregate concrete (GGRAC)-based members subjected to axial compressive loading. A total of nine compressive members (250 mm in cross-section and 1150 mm in height) were constructed to examine the effect of the number of longitudinal GFRP bars and the vertical spacing of transverse GFRP hoops/ties. The experimental results portrayed that the ductility of GGRAC compressive members improved with the reduction in the pitch of GFRP hoops. The axial load-carrying capacity (LCC) of GGRAC compressive members increased by increasing the number of GFRP bars up to eight (corresponding to a reinforcement ratio of 2.11%) while it decreased by using ten longitudinal GFRP bars (corresponding to a reinforcement ratio of 2.65%). Additionally, an empirical model was suggested to predict the axial LCC of GGRAC compressive members based on a large amount of experimental data of similar members. The experimental results and related theoretical predictions substantially prove the applicability and accuracy of the proposed model. The proposed column represents a feasible structural member in terms of material availability and environmental sustainability.

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