scholarly journals Parametric Study on the Effect of Steel Confinement in Short Bridge Piers Retrofitted with Externally-Wrapped FRP

2019 ◽  
Vol 271 ◽  
pp. 01012
Author(s):  
Diogo Zignago ◽  
Michele Barbato
Keyword(s):  
Compressive Strength ◽  
Parametric Study ◽  
Fiber Reinforced Polymer ◽  
Confined Concrete ◽  
Bridge Piers ◽  
Element Analysis ◽  
Reinforced Polymer ◽  
Externally Bonded ◽  
Frp Wrapping ◽  
Concrete Model

Confinement of reinforced concrete (RC) piers generally has a beneficial effect on both the compressive strength and the ductility of the confined member. Thus, externally-bonded fiber-reinforced polymer (FRP) wrapping is often used as a retrofit technique for bridge piers when additional compressive strength is needed. This study employs finite element analysis and a recently developed FRP-and-steel confined concrete model to investigate the influence of internal steel confinement on the response of circular RC columns confined with FRP and subject to concentric axial load. This new model leads to more accurate estimates of the response of these columns, what is particularly relevant for piers in short span bridges that are subjected mainly to vertical loads, for which it could lead to a more efficient and economical piers’ retrofit, as well as a more accurate and less conservative bridge rating. A parametric study is conducted to examine the importance of some key parameters in the design of such columns.

scholarly journals Compressive Strength Testing of Hybrid Concrete-Filled Fiber-Reinforced Plastic Tubes Confined by Filament Winding

2021 ◽  
Vol 11 (7) ◽  
pp. 2900
Author(s):  
In-Kyu Kang ◽  
Sun-Hee Kim
Keyword(s):  
Compressive Strength ◽  
High Strength ◽  
Maximum Error ◽  
Filament Winding ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Element Analysis ◽  
Reinforced Polymer ◽  
Reinforced Plastic ◽  
Frp Tube

In this study, an experiment on compressive strength of the hybrid concrete-filled fiber-reinforced polymer (FRP) tube (CFFT) confined by filament winding was conducted to improve the longitudinal strength while considering the thickness of filament winding as a variable. A maximum error of 17% was observed when the results of performing the finite element analysis (FEA) by applying the mechanical properties of the fiber-reinforced polymer (FRP) materials suggested in previous studies were compared to those of the compressive strength experiment on the hybrid-CFFT. Moreover, a maximum error of 15% was exhibited when the results derived from the strength equation proposed by analyzing the compressive strength experiment were compared. Furthermore, the compressive strength of the hybrid-CFFT increased by up to 14% when the longitudinal compressive strength of the pre-tensioned spun high strength concrete (PHC) pile and concrete-filled tube (CFT) were compared.

scholarly journals A Proposed Soft Computing Model for Ultimate Strength Estimation of FRP-Confined Concrete Cylinders

2020 ◽  
Vol 10 (5) ◽  
pp. 1769 ◽  
Author(s):  
Reza Kamgar ◽  
Hosein Naderpour ◽  
Houman Ebrahimpour Komeleh ◽  
Anna Jakubczyk-Gałczyńska ◽  
Robert Jankowski
Keyword(s):  
Compressive Strength ◽  
Soft Computing ◽  
Concrete Strength ◽  
Fiber Reinforced Polymer ◽  
Confined Concrete ◽  
Confinement Pressure ◽  
Reinforced Polymer ◽  
Soft Computing Techniques ◽  
Concrete Cylinders ◽  
New Formulation

In this paper, the feed-forward backpropagation neural network (FFBPNN) is used to propose a new formulation for predicting the compressive strength of fiber-reinforced polymer (FRP)-confined concrete cylinders. A set of experimental data has been considered in the analysis. The data include information about the dimensions of the concrete cylinders (diameter, length) and the total thickness of FRP layers, unconfined ultimate concrete strength, ultimate confinement pressure, ultimate tensile strength of the FRP laminates and the ultimate concrete strength of the concrete cylinders. The confined ultimate concrete strength is considered as the output data, while other parameters are considered as the input data. These parameters are mostly used in existing FRP-confined concrete models. Soft computing techniques are used to estimate the compressive strength of FRP-confined concrete cylinders. Finally, a new formulation is proposed. The results of the proposed formula are compared to the existing methods. To verify the proposed method, results are compared with other methods. The results show that the described method can forecast the compressive strength of FRP-confined concrete cylinders with high precision in comparison with the existing formulas. Moreover, the mean percentage of error for the proposed method is very low (3.49%). Furthermore, the proposed formula can estimate the ultimate compressive capacity of FRP-confined concrete cylinders with a different type of FRP and arbitrary thickness in the initial design of practical projects.

Study on Compressive Strength of Fiber Reinforced Polymer Confined Concrete

2011 ◽  
Vol 477 ◽  
pp. 443-452
Author(s):  
Li Wen Zhang ◽  
Jun Ping Zhang ◽  
Zuo Sun
Keyword(s):  
Numerical Simulation ◽  
Compressive Strength ◽  
Compressive Load ◽  
Fiber Reinforced Polymer ◽  
Confined Concrete ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Dimension Analysis ◽  
Confinement Stress ◽  
Set Up

The study on compressive strength of fiber reinforced polymer confined concrete was conducted in this paper. Firstly, the general confinement mechanics was revealed, in which the confinement stress-σl, the restraint stiffness-El and the ultimate confinement stress-fl were proposed. Secondly, the influences of various parameters on compressive strength were analyzed by recent related studies and numerical simulation. The numerical simulation was carried out through the total of 27 finite element models under axial compressive load which were constructed by using software-ANSYS. Finally, the compressive strength model was set up by the dimension analysis and numerical regression.

The effect of nano- and micron-scale filler modified epoxy matrix on glass-fiber reinforced polymer insulator component behavior

2021 ◽  
pp. 146442072110007
Author(s):  
Iurii Burda ◽  
Michel Barbezat ◽  
Andreas J Brunner
Keyword(s):  
Fracture Toughness ◽  
Compressive Strength ◽  
Glass Fiber ◽  
Epoxy Matrix ◽  
Ternary Systems ◽  
Fiber Reinforced Polymer ◽  
Core Shell ◽  
Glass Fiber Reinforced Polymer ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced

Glass-fiber reinforced polymer (GFRP) composite rods with epoxy matrix filled with electrically nonconducting particles find widespread use in high-voltage electrical insulator applications. The service loads require a range of different, minimum material property values, e.g. toughness, tensile, or compressive strength, but also component-specific performance, e.g. pull-out friction of surface crimped metal fittings or electric breakdown strength. The contribution discusses selected examples of the effects of different particle filler types on the properties of filled epoxy resin as well as on the behavior of GFRP rods with such a matrix. In all investigated systems CaCO3 was used as micron-sized filler, complemented by different amounts of either nanosilica or core-shell rubber (binary filler), or by both, nanosilica and core-shell rubber (ternary filler). With ternary filler combinations at a content of 36 wt%, fracture toughness GIC was improved in nanocomposite epoxy plates and in GFRP rods by 60% and 100%, respectively compared to a matrix with 20 wt% CaCO3 (used as reference system). The glass transition temperature Tg for some ternary systems dropped from 160 °C (for neat epoxy), to approximately 140 °C, the maximum allowed drop in Tg in view of requirements from further processing steps of the electrically insulating components. The ternary fillers yield transfer of the improvements of fracture properties from epoxy nanocomposite plates into the GFRP rods beyond that of the system with CaCO3 filler only. Compressive strength of the GFRP rods was improved by about 20% only for the binary nanosilica and CaCO3 filler, and was not significantly enhanced with the ternary systems. That combination, however, did not yield improvements in toughness beyond the CaCO3-filled nanocomposite plates and rods. With the range of filler types and contents investigated here, it was hence not possible to simultaneously optimize both, fracture toughness and compressive strength of the GFRP insulator rods.

scholarly journals Compressive Strength of Modified FRP Hybrid Bars

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1898
Author(s):  
Marek Urbański
Keyword(s):  
Compressive Strength ◽  
Modulus Of Elasticity ◽  
Basalt Fiber ◽  
Test Method ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Free Length ◽  
Compression Properties ◽  
Reinforced Polymer ◽  
Frp Bars

A new type of HFRP hybrid bars (hybrid fiber reinforced polymer) was introduced to increase the rigidity of FRP reinforcement, which was a basic drawback of the FRP bars used so far. Compared to the BFRP (basalt fiber reinforced polymer) bars, modification has been introduced in HFRP bars consisting of swapping basalt fibers with carbon fibers. One of the most important mechanical properties of FRP bars is compressive strength, which determines the scope of reinforcement in compressed reinforced concrete elements (e.g., column). The compression properties of FRP bars are currently ignored in the standards (ACI, CSA). The article presents compression properties for HFRP bars based on the developed compression test method. Thirty HFRP bars were tested for comparison with previously tested BFRP bars. All bars had a nominal diameter of 8 mm and their nonanchored (free) length varied from 50 to 220 mm. Test results showed that the ultimate compressive strength of nonbuckled HFRP bars as a result of axial compression is about 46% of the ultimate strength. In addition, the modulus of elasticity under compression does not change significantly compared to the modulus of elasticity under tension. A linear correlation of buckling load strength was proposed depending on the free length of HFRP bars.

scholarly journals Study on Repaired Earthquake-Damaged Bridge Piers under Seismic Load

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Jun Deng ◽  
Tonghua Liu ◽  
Weizhi Xie ◽  
Wei Lu
Keyword(s):  
Peak Load ◽  
Steel Tube ◽  
Fiber Reinforced Polymer ◽  
Bridge Piers ◽  
Seismic Load ◽  
Concrete Bridge ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Repair Materials ◽  
Rc Bridge Piers

The concrete bridge pier damaged during earthquakes need be repaired to meet the design standards. Steel tube as a traditional material or FRP as a novel material has become popular to repair the damaged reinforced concrete (RC) bridge piers. In this paper, experimental and finite element (FE) studies are employed to analyze the confinement effectiveness of the different repair materials. The FE method was used to calculate the hysteretic behavior of three predamaged circle RC bridge piers repaired with steel tube, basalt fiber reinforced polymer (BFRP), and carbon fiber reinforced polymer (CFRP), respectively. Meanwhile, the repaired predamaged circle concrete bridge piers were tested by pseudo-static cyclic loading to study the seismic behavior and evaluate the confinement effectiveness of the different repair materials and techniques. The FE analysis and experimental results showed that the repaired piers had similar hysteretic curves with the original specimens and all the three repair techniques can restore the seismic performance of the earthquake-damaged piers. Steel tube jacketing can significantly improve the lateral stiffness and peak load of the damaged pier, while the BFRP and CFRP sheets cannot improve these properties due to their thin thickness.

Nonlinear Analysis of R.C Beams Strengthened with CFRP

2012 ◽  
Vol 166-169 ◽  
pp. 1517-1520
Author(s):  
Wen Sheng Li ◽  
Kai Wang
Keyword(s):  
Finite Element ◽  
Carbon Fiber ◽  
Nonlinear Analysis ◽  
Element Model ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Element Analysis ◽  
Flexural Performance ◽  
Reinforced Polymer ◽  
Flexural Resistance

In order to study on the flexural performances of beams strengthened with external bonded carbon fiber reinforced polymer（CFRP）sheets, nonlinear analysis is carried out by using software ANSYS. The results show that a reasonable finite element model, using a reasonable solution strategy can be a good simulation of CFRP flexural performance of reinforced concrete beams, and finite element analysis results with the experimental results have good consistency .The beams reinforced by carbon fiber polymer，the capacity of flexural resistance increased with the numbers of carbon fiber paste sheets, reinforced components of flexural capacity significantly improved, but the extent of its increase is not proportional with the numbers of carbon fiber paste sheets.

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