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Number of results: 12
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Abstract

The widespread use of Fibre-Reinforced Polymers (FRP) reinforced concrete (RC) structural members is hindered by their low fire resistant characteristics, limiting their use to cases, where fire resistance is not a priority. Presented and discussed are experimental results pertaining to the flexural members subjected to heating and simultaneous loading. Solely non-metallic FRP bars: (i) Basalt FRP (BFRP), (ii) Hybrid FRP (HFRP) with carbon and basalt fibres and (ii) nano-Hybrid FRP (nHFRP) with modified epoxy resin, were used as internal reinforcement for beams. The destruction of the beams was caused in different ways, beams reinforced with BFRP bars were destroyed by reinforcement failure while those reinforced with hybrid FRP bars were destroyed by concrete crushing. The BFRP reinforced beams obtained a maximum temperature, measured directly on the bars, of 917 °C, compared to beams reinforced with hybrid FRP bars, where the temperature on the bars reached 400-550 °C at failure. Moreover, the highest registered ductility was obtained for BFRP reinforced beams as well, where the maximum deflections reached approximately 16 cm.

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Authors and Affiliations

Kostiantyn Protchenko
ORCID: ORCID
Marek Urbański
ORCID: ORCID
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Abstract

The state of the art in the field of composite polymer bridges in Poland is presented below. Such bridges were built from 1999. Some of them are fully composite polymer structure. Others are developed as hybrid structure. There are two kind of structures: steel girders with FRP deck and FRP girders with concrete deck. Different production methods of FRP elements were used: pultrusion and infusion. Some bridges are the result of research programs, but there are also some commercial projects. Also, the short application history of FRP bridges all over the world is presented and material properties of the construction material are given in the paper. Those materials are much more lighter than steel or concrete. Low weight of FRP materials is an advantage but also disadvantage. It is good from structural and economical point of view because the dimensions of girders, piers and foundation will be smaller. From opposite side to light structure could cause problems related to response of structure against dynamic actions. As a final result the fatigue strength and durability will be reduced. Of course, the high cost of FRP (CFRP especially) limits at the moment range of application. The presented in the paper bridge structures show that despite of mentioned above problems they are now in good conditions and their future life looks optimistic. It could be supposed that modification and/or development of FRP production technologies more better utilizing their properties will create more elegant and useful bridges.
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Bibliography


[1] Chróścielewski J., Miśkiewicz M., Pyrzowski Ł, Wilde K., “Composite GFRP U-shaped footbridge”, Polish Maritime Research, Special Issue 2017 S1 (93) 2017 Vol. 24, pp. 25–31.
[2] Chróścielewski J., Miśkiewicz M., Pyrzowski Ł, Sobczyk B., Wilde K., “A novel sandwich footbridge – Practical application of laminated composites in bridge design and in situ measurements of static response”, Composites Part B Vol. 126, 2017, pp. 153–161.
[3] De Corte W., Jansseune A., Van Paepegem W., Peeters J., “Structural behaviour and robustness assessment of an InfraCore inside bridge deck specimen subjected to static and dynamic local loading”, Proceedings of the 21st International Conference on Composite Materials, Xi’an, 2017.
[4] Dong C.J., “Development of a process model for the vacuum assisted resin transfer molding simulation by the response surface method”, Composites: Part A Vol. 37, 2006, pp. 1316–1324.
[5] Grotte, B., Karwowski W., Mossakowski, P., Wróbel, M., Zobel, H., Żółtowski, P.: Steel, arch footbridge with composite polymer deck. „Wroclaw Bridge Days” - „Footbridges – Architecture, design, construction, research”. 29–30 November 2007, pp. 135–146.
[6] Grotte B., Karwowski W., Mossakowski P., Wróbel M., Zobel H., Żółtowski P., “Steel, arch footbridge with composite polymer deck with suspended composite polymer deck over S-11 highway nearby Kórnik”, Inżynieria i Budownictwo 1-2/2009, pp. 69–73.
[7] Karwowski W., “Material - structural conditions of joints in FRP bridges”, Ph. D. thesis, Warsaw University of Technology, Warsaw 2011.
[8] Madaj A., “Composite polymer bridges. New structural solutions of bridge girders”, Mosty 3/2015, pp. 58-60.
[9] Mossakowski P., Wróbel M., Zobel H., Żółtowski P. ,Pedestrian steel arch bridge with composite polymer deck. IV International Conference on “Current and future trends in bridge design, construction and maintenance”. Kuala Lumpur. Malaysia. October 2005.
[10] Mylavarapu R., Patnaik A., Puli K., R. K., “Basalt FRP: A new FRP material for infrastructure market?”, Proceedings of 4th International Conference on Advanced Composite Materials in Bridges and Structures, Canadian Society of Civil Engineers, Montreal, 2004.
[11] Patnaik A., “Applications of basalt fiber reinforced polymer (BFRP) reinforcement for transportation infrastructure”. Developing a Research Agenda for Transportation Infrastructure, TRB November, 2009.
[12] Pilarczyk K., “Application of composite panels InfraCore inside bridge structures”, Mosty 5/ 2019, pp. 74–75.
[13] Siwowski T., Kaleta D., Rajchel M., “Structural behaviour of an all-composite road bridge”, Composite Structures 192: pp. 555–567, 2018.
[14] Siwowski T., Rajchel M., Własak L., “Experimental study on static and dynamic performance of a novel GFRP bridge girder”, Composite Structures Vol. 259, 2021.
[15] Siwowski T., Rajchel M., Kulpa M, “Design and field evaluation of a hybrid FRP composite – lightweight concrete road bridge”, Composite Structures, Vol. 230, 2019.
[16] Siwowski T., Rajchel M., “Structural performance of a hybrid FRP composite – lightweight concrete bridge girder”, Composites Part B Vol. 174, 2019.
[17] Wąchalski K., “The design of renovation and widening of the J. Piłsudskiego bridge across Vistula river in Toruń, Poland”, Mosty 1/2021, pp. 50–56, (in Polish).
[18] Zobel H., Karwowski W, Wróbel M., „GFRP pedestrianbridge”, Inżynieria i Budownictwo nr 2/2003, pp. 107–108, (in Polish).
[19] Zobel H., “Composite Polymer Bridges”, Proceedings of 50-tie Conference „Scientific and Research Problems in Civil Engineering”, Krynica 2004, Vol I, pp. 381–410 (in Polish).
[20] Zobel H., Grotte B., Karwowski W., Wasiliew P., Wrobel M., Zoltowski P.: Pedestrian steel arch bridge with composite polymer deck and CFRP stays. IABSE Symposium “Metropolitan Habitats and Infrastructure”. Shanghai, China. September 2004. pp. 88–89 + CD.
[21] Zobel H., Karwowski W., Bridge composite polymer decks. Inżynieria i Budownictwo 11/2005, pp. 594–598. (in Polish).
[22] PN-EN 13706-3: 2004 Composite polymers. Technical Specifications for the profiles produced with pultrusion method. Part 3: Detailed requirements.
[23] http://www.mdacomposites.org/, 2005.
[24] Information Materials of the Mostostal Warszawa S.A. “Com-bridge – construction of the FRP structure”, 2016.
[25] Report of the Research Project “Material and structural conditions for joints in bridge structures made of FRP profiles realized in the Faculty of Civil Engineering at Warsaw University of Technology”. The project realized in 2005–2008 and financed by the Polish Ministry of Education and Science.
[26] https://fiberline.com/, 2021.
[27] https://www.kolbudy.pl, 2021.
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Authors and Affiliations

Tomasz Siwowski
1
ORCID: ORCID
Henryk Zobel
2
ORCID: ORCID
Thakaa Al-Khafaji
2
ORCID: ORCID
Wojciech Karwowski
2
ORCID: ORCID

  1. Rzeszow University of Technology, Faculty of Civil & Environmental Engineering & Architecture, ul. Powstancow Warszawy 12, 35-859 Rzeszow, Poland
  2. Warsaw University of Technology, Faculty of Civil Engineering, Al. Armii Ludowej 16, 00-637 Warsaw, Poland
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Abstract

Over the past decades, using of sustainable materials in construction is a challenging issue, thus Fibre Reinforced Polymers (FRP) took the attention of civil and structural engineers for its lightweight and high-strength properties. The paper describes the results of the shear strength testing of three different types of bars: (i) basalt- FRP (BFRP), (ii) hybrid FRP with carbon and basalt fibres (HFRP) and (iii) nano-hybrid FRP (nHFRP), with modification of the epoxy matrix of the bar. The hybridization of carbon and basalt fibres lead to more costefficient alternative than Carbon FRP (CFRP) bars and more sustainable alternative than Basalt FRP (BFRP) bars. The BFRP, HFRP and nHFRP bars with different diameters ranging from Ø4 to Ø18 mm were subjected to shear strength testing in order to investigate mechanical properties and the destruction mechanism of the bars. Obtained results display a slight downward trend as the bar diameter increase, which is the most noticeable for HFRP bars. In most of the cases, BFRP bars were characterized by greater shear deformation and less shear strength compared to HFRP and nHFRP bars. Performed testing may contribute to comprehensive understanding of the mechanical behavior of those types of FRP bars.
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Authors and Affiliations

Kostiantyn Protchenko
1
ORCID: ORCID
Fares Zayoud
2
ORCID: ORCID
Marek Urbański
3
ORCID: ORCID

  1. MSc., Eng., Warsaw University of Technology, Faculty of Civil Engineering, Al. Armii Ludowej 16, 00-637 Warsaw, Poland
  2. BSc., Eng., Warsaw University of Technology, Faculty of Civil Engineering, Al. Armii Ludowej 16, 00-637 Warsaw, Poland
  3. PhD., Eng., Warsaw University of Technology, Faculty of Civil Engineering, Al. Armii Ludowej 16, 00-637 Warsaw, Poland
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Abstract

The paper describes the recent developments of Hybrid Fibre-Reinforced Polymer (HFRP) and nano-Hybrid Fibre-Reinforced Polymer (nHFRP) bars. Hybridization of less expensive basalt fibres with carbon fibres leads to more sustainable alternative to Basalt-FRP (BFRP) bars and more economically-efficient alternative to Carbon-FRP (CFRP) bars. The New-Developed HFRP bars were subjected to tensile axial loading to investigate its structural behaviour. The effect of hybridization on tensile properties of HFRP bars was verified experimentally by comparing the results of tensile test of HFRP bars with non-hybrid BFRP bars. It is worth to mention that the difference in obtained strength characteristics between analytical and numerical considerations was very small, however the obtained results were much higher than results obtained experimentally. Authors suggested that lower results obtained experimentally can be explained by imperfect interphase development and therefore attempted to improve the chemical cohesion between constituents by adding nanosilica particles to matrix consistency.

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Authors and Affiliations

E.D. Szmigiera
K. Protchenko
M. Urbański
A. Garbacz
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Abstract

Several recent earthquakes have indicated that the design and construction of bridges based on former seismic design provisions are susceptible to fatal collapse triggered by the failure of reinforced concrete columns. This paper incorporates an experimental investigation into the seismic response of nonductile bridge piers strengthened with low-cost glass fiber reinforced polymers (LC-GFRP). Three full-scale bridge piers were tested under lateral cyclic loading. A control bridge pier was tested in the as-built condition and the other two bridge piers were experimentally tested after strengthening them with LC-GFRP jacketing. The LC-GFRP strengthening was performed using two different configurations. The control bridge pier showed poor seismic response with the progress of significant cracks at very low drift levels. Test results indicated the efficiency of the tested strengthening configurations to improve the performance of the strengthened bridge piers including crack pattern, yield, and ultimate cyclic load capacities, ductility ratio, dissipated energy capacity, initial stiffness degradation, and fracture mode.

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Authors and Affiliations

K. Rodsin
Q. Hussain
P. Joyklad
A. Nawaz
H. Fazliani
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Abstract

Mechanical properties of FRP such as strength and stiffness as well as the bonding interface between FRP and concrete will be badly deteriorated when exposed to high temperature. Furthermore, the effect of thickness of insulation with different type of concrete strength has not yet been studied elsewhere in numerical studies. Therefore, this study is to assess the thermal-structural behaviour of insulated FRP strengthened RC beam exposed to elevated temperature using ABAQUS. The proposed numerical model of 200 ×300 mm RC beam subjected to 2 hours standard fire curve (ISO 834) had been validated with the analytical solution. The validated numerical model then is used in parametric study to investigate the behaviour of fire damaged normal strength concrete (40 MPa) and high strength concrete (60 MPa) of RC beam strengthened with CFRP using various fire insulation thickness of 12.5 mm, 25 mm and 40 mm, respectively. The result of steel characteristic strength reduction factor is compared with analytical using 500˚C Isotherm methods. The parametric studies indicated that the fire insulation layer is essential to provide fire protection to the CFRP strengthened RC beams when exposed to elevated temperature. The insulation layer thickness of 25 mm had been found to be the optimum thickness to be used as it is able to meet the criteria of temperature distribution and displacement requirement. In conclusion, the numerical model developed using ABAQUS in this study is to carry out assessment on the thermal-structural behaviour of the insulated CFRP-strengthened RC beams at elevated temperature.
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Authors and Affiliations

Ng Chee Keong
1
ORCID: ORCID
Mariyana Aida Ab Kadir
2 3
ORCID: ORCID
Nurizaty Zuhan
2
ORCID: ORCID
Muhammad Najmi Mohamad Ali Mastor
4
ORCID: ORCID
Mohd Nur Asmawisham Alel
5
ORCID: ORCID

  1. Public Work Department, Jalan Sultan Salahuddin, 50582 Kuala Lumpur, Malaysia
  2. School of Civil Engineering, University Teknologi Malaysia, 81310 Skudai, Johor Bahru, Johor, Malaysia
  3. Institute of Noise and Vibration, University Teknologi Malaysia, 81310 Skudai, Johor Bahru, Johor, Malaysia
  4. Candidate, School of Civil Engineering, University Teknologi Malaysia, 81310 Skudai, Johor Bahru, Johor, Malaysia
  5. Engineering Seismology and Earthquake Engineering Research (eSEER), Institute of Noise and Vibration, Universiti Teknologi Malaysia, 81310 Skudai, Johor Bahru, Johor, Malaysia
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Abstract

The use of FRP materials as external reinforcement of masonry structures has been recognized as an effective and minimally invasive method ofwall strengthening. The available literature and research reports confirmthe positive effect of the strip-like arrangement of composites with a horizontal, diagonal and – as shown in the paper – vertical configuration. The problem here is the proper estimation of the benefits of such FRP reinforcement, namely determining the real increase in shear strength. The paper described selected calculation procedures that can be found in the available literature (proprietary solutions), as well as in the published guidelines for the design of masonry walls strengthening using FRP materials. The results of experimental tests of sheared masonry walls made of AAC blocks and strengthened using vertical strips of carbon and glass fibres are briefly presented. Finally, based on the presented formulae, the values of the theoretical shear force resulted from the FRP contribution were calculated and detailed discussed.
The comparison of the experimental and theoretical shear forces showed that only one of the presented calculation methods gave a high agreement of the results for both carbon and glass sheets. In addition, it was noticed that in two cases the effects of strengthening – depending on the material used – drastically differed, which was not observed in the research.
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Authors and Affiliations

Marta Kałuża
1
ORCID: ORCID

  1. Silesian University of Technology, Faculty of Civil Engineering, Akademicka 5, 44-100 Gliwice, Poland
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Abstract

Fiber reinforced polymers (FRPs) due to their specific high-strength properties become more and more popular and replace traditional structural materials like conventional steel in prestressed concrete structures. FRP reinforced structures are relatively new when compared to structures prestressed with steel tendons. For that reason only several studies and applications of pre-tensioned FRP reinforcement have been conducted until now. Moreover, researchers only considered short-term behavior of FRP reinforced concrete members. The precise information about long-term behavior of FRP reinforcement is necessary to evaluate the prestress losses, which should be taken into account in the design of prestressed RC structures. One of the most important factor influencing long term behavior of FRP reinforcement is stress relaxation. The overview of experimental tests results described in the available literature considering the prestress losses obtained in FRP prestressed concrete members is presented herein.

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Authors and Affiliations

M. Przygocka
R. Kotynia
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Abstract

The selection of the most proper strengthening method/system with an assessment of its effectiveness is quite complicated in the case of masonry structures, mainly due to their huge diversity in materials. The most popular strengthening materials based on the composite fibres and are laid on the masonry wall using epoxy adhesives (FRP system) or mineral mortars (FRCM system). This article presents a comparison of external strengthening made using different glass-fibre-based materials on the behaviour of specific masonry walls. The walls are made of AAC blocks (Autoclaved Aerated Concrete), commonly used in rather low urban buildings or skeleton construction. As a strengthening material the GFRP sheets and two types of glass meshes are used. The walls are subjected to diagonal compression, which reflects the shearing of the walls. The scope of research describes cracking stage, shear capacity and analysis of the mode of failure of tested walls.

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Authors and Affiliations

Marta Kałuża
ORCID: ORCID
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Abstract

The present work focuses on the fabrication of glass fiber and multifilament discarded fishnet nylon fiber polymer composites with four different fiber compositions. Composites are molded by means of simple hand lay-up methodology with dissimilar layers of the fiber mat. The mechanical characterization (tensile and impact) and thermal analysis of composites have to be investigated. Among the different patterns, hybrid composites reflected better tensile and impact properties as compared to the conventional materials. Morphological characterization was carried out to figure out the de-bonding of fiber/matrix adhesion characteristics of fractured face of tensile testing samples. The result suggests the potential for reuse of discarded fishnet, which constitutes a better alternative for structural work and for possible applications to be used to develop added-value products.

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Authors and Affiliations

P. Monivarman
V.A. Nagarajan
F.M. Raj
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Abstract

Pavements made of cement concrete, used for road constructions, are damaged during use. This applies to both the pavements of rural and forest roads with very low traffic loads, as well as road pavements with high traffic loads. One of the most effective ways of repairing damaged concrete cement pavements is through placing an asphalt overlay on a concrete slab. In order to increase the fatigue life of the asphalt overlay, asphalt mixtures are modified with fibres. One technological solution is to use FRP (Fiber Reinforced Polymer), an innovative material with improved properties.

The aim of this paper is to assess the impact of asphalt overlays modified with a new type of fibres to strengthen the durability of weakened cement concrete pavement structures.

On the basis of the conducted analyses, it was shown that the use of an asphalt layer reinforcement increases fatigue life, for both 15 cm thick prefabricated slabs and a typical road pavement for average traffic made of 25 cm doweled and anchored concrete slabs. There was a significant increase in the fatigue life of the concrete pavement structure as a result of modifying the overlaid asphalt mixture with FRP fibres.

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Authors and Affiliations

P. Tutka
R. Nagórski
P. Radziszewski
M. Sarnowski
M. Złotowska
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Abstract

Wood plastic composite (WPC) is a lightweight material, resistant against corrosion and damage, with recyclability of consuming materials. These materials usually used in marine structures frequently due to their unique features. In order to strengthen beams made by this material, usually Fibre-reinforced plastic (FRP) sheets are used, and one of the fracture modes in these beams is debonding of FRP sheet from the surface of the beams. To deal with this problem some grooves are used in the surface of the beam to improve the contact surface. The grooves include longitudinal, transverse and diagonal grooves. The main goal of this study is to assess different grooving methods in WPC-FRP beams. In this regard, primarily criteria (improving resistance, performance speed, performance complexity, performance costs, displacement and absorbing energy) were determined through interviews with experts in this field in order to assess the beams. Then, SWARA method employed to evaluate criteria with a policy based perspective and finally EDAS method applied for evaluating related alternatives. Based on obtained results, the longitudinal groove method is the best way of strengthening WPC beams to prevent debonding.

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Authors and Affiliations

Mahdi Chini
Shahid Arefi Lale
Sarfaraz Zolfani Hashemkhani
Leonas Ustinovicius

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