scholarly journals Behavior of Glulam Beams Strengthened in bending with BFRP Fabrics

2021 ◽  
Vol 31 (2) ◽  
pp. 1-14
Author(s):  
Agnieszka Wdowiak-Postulak ◽  
Grzegorz Świt
Keyword(s):  
Bending Strength ◽  
Load Capacity ◽  
Experimental Studies ◽  
Basalt Fiber ◽  
Fiber Reinforced Polymers ◽  
Structural Elements ◽  
Basalt Fibers ◽  
Reinforced Polymers ◽  
Glued Laminated Timber ◽  
Environmentally Friendly Method

Abstract The article presents results of an experimental studies on reinforcement of pine beams made from glued laminated timber with subsurface basalt fibers (BFRP). An experimental research program was presented, in which the bending strength of glued laminated timber of middle and lower quality class was increased after using BFRP basalt fabrics. Thanks to the use of BFRP reinforcement, an average load capacity increased by 47% and stiffness by 6% in comparison to non-reinforced elements. Based on the research, it was found that the use of BFRP basalt fabrics is an effective method for strengthening damaged wooden elements. Thus, it is an environmentally friendly method of improving the static work of structural elements by combining wood with other natural materials such as basalt fiber reinforced polymers.

scholarly journals Reinforcing effect of a thin basalt fiber-reinforced polymer plywood coating

BioResources ◽  
2019 ◽  
Vol 14 (1) ◽  
pp. 2062-2078
Keyword(s):  
Bending Strength ◽  
Basalt Fiber ◽  
Image Correlation ◽  
Fiber Reinforced Polymers ◽  
Strengthening Effect ◽  
Fiber Reinforced ◽  
Reinforced Polymers ◽  
Reinforcing Effect ◽  
Highest Weight ◽  
The Impact

The strengthening effect of basalt fiber-reinforced epoxy coatings was investigated with regard to their areal weight and position on the compression or tension side of plywood. Beach plywood was coated on one side with a basalt fiber-reinforced epoxy matrix. Two biaxial and one twilled fabric with areal weights of 170 g/m2, 210 g/m2, and 340 g/m2 respectively were used. The thickness of the plywood was 21 mm. The results showed the best reinforcing effect was obtained with the highest weight when mounted on the tension side of the parallel specimens. The bending strength of these specimens was improved by 15.7%. The perpendicular specimens were positively reinforced by the fiber-reinforced polymers on both the compression and tension sides. The tension reinforcement provided a higher deflection, which was further analyzed using digital image correlation. The evaluated data indicated significant displacement of the neutral axis. The impact strength of the parallel specimens was not improved by the reinforcement, but all of the reinforced perpendicular specimens were significantly strengthened.

scholarly journals Bond between Concrete and Multi-Directional CFRP Laminates

2010 ◽  
Vol 133-134 ◽  
pp. 917-922 ◽  
Author(s):  
José Sena-Cruz ◽  
Joaquim Barros ◽  
Mário Coelho
Keyword(s):  
Carbon Fiber ◽  
Civil Engineering ◽  
Fiber Reinforced Polymers ◽  
Structural Elements ◽  
Engineering Applications ◽  
Carbon Fiber Reinforced Polymers ◽  
Reinforced Polymers ◽  
Cfrp Laminate ◽  
Cfrp Laminates ◽  
Pullout Tests

Recently, laminates of multi-directional carbon fiber reinforced polymers (MDL-CFRP) have been developed for Civil Engineering applications. A MDL-CFRP laminate has fibers in distinct directions that can be arranged in order to optimize stiffness and/or strength requisites. These laminates can be conceived in order to be fixed to structural elements with anchors, resulting high effective strengthening systems. To evaluate the strengthening potentialities of this type of laminates, pullout tests were carried out. The influence of the number of anchors, their geometric location and the applied pre-stress are analyzed. The present work describes the carried-out tests and presents and analyzes the most significant obtained results.

scholarly journals Carbon, Glass and Basalt Fiber Reinforced Polybenzoxazine: The Effects of Fiber Reinforcement on Mechanical, Fire, Smoke and Toxicity Properties

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2379
Author(s):  
Nick Wolter ◽  
Vinicius Carrillo Beber ◽  
Anna Sandinge ◽  
Per Blomqvist ◽  
Frederik Goethals ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Basalt Fiber ◽  
Fiber Reinforcement ◽  
Fiber Reinforced Polymers ◽  
Fiber Reinforced ◽  
Reinforced Polymers ◽  
Basalt Glass ◽  
Bisphenol F ◽  
Fire Smoke ◽  
Carbon Fiber Reinforced

Bisphenol F and aniline-based benzoxazine monomers were selected to fabricate basalt, glass and carbon fiber reinforced polybenzoxazine via vacuum infusion, respectively. The impacts of the type of fiber reinforcement on the resulting material properties of the fiber reinforced polymers (FRPs) were studied. FRPs exhibited a homogenous morphology with completely impregnated fibers and near-zero porosity. Carbon fiber reinforced polybenzoxazine showed the highest specific mechanical properties because of its low density and high modulus and strength. However, regarding the flammability, fire, smoke and toxicity properties, glass and basalt reinforced polybenzoxazine outperformed carbon fiber reinforced polybenzoxazine. This work offers a deeper understanding of how different types of fiber reinforcement affect polybenzoxazine-based FRPs and provides access to FRPs with inherently good fire, smoke and toxicity performance without the need for further flame retardant additives.

Seismic Upgrading of a Masonry Church with FRP Composites

2016 ◽  
Vol 866 ◽  
pp. 119-123 ◽  
Author(s):  
Gabriele Milani ◽  
Rafael Shehu ◽  
Marco Valente
Keyword(s):  
Seismic Performance ◽  
Fiber Reinforced Polymers ◽  
Seismic Action ◽  
Structural Elements ◽  
Lateral Loads ◽  
Reinforced Polymers ◽  
Preliminary Results ◽  
Existing Structures ◽  
Frp Composites ◽  
The Church

This paper presents some preliminary results of seismic analyses performed on a masonry church located in Emilia-Romagna (Italy). The church suffered damage during the seismic events occurred in 2012 and some seismic upgrading interventions by means of Fiber Reinforced Polymers (FRPs) are proposed. The behavior of the church is investigated under horizontal loads simulating a seismic action defined in accordance with Italian Code indications. The preliminary results of the numerical analyses performed on the church in the unretrofitted configuration put in evidence both the insufficient strength of some structural elements when subjected to lateral loads and a typical failure mode of the façade. Two seismic upgrading interventions with FRP composites are simulated in order to increase the seismic performance of the church. Such interventions are carried out according to the provisions of Italian Code for FRP strengthening of existing structures. Numerical results show that a proper seismic upgrading intervention by means of FRP composites is effective to improve the seismic performance of the church.

Compressive behavior of circular and square concrete column externally confined by different types of basalt fiber–reinforced polymer

2020 ◽  
Vol 23 (8) ◽  
pp. 1534-1547 ◽  
Author(s):  
Jingting Huang ◽  
Tao Li ◽  
Dayong Zhu ◽  
Peng Gao ◽  
An Zhou
Keyword(s):  
Basalt Fiber ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced Polymers ◽  
Test Results ◽  
Fiber Reinforced ◽  
Compressive Behavior ◽  
Reinforced Polymers ◽  
Reinforced Polymer ◽  
Polymer Wrapping ◽  
Basalt Fiber Reinforced Polymer

This article studies the compressive behavior of concrete columns confined by different basalt fiber–reinforced polymers. A total of 30 columns were divided into 10 groups according to section shapes (circular and square), basalt fiber–reinforced polymer types (unidirectional basalt fiber–reinforced polymer, bidirectional basalt fiber–reinforced polymer, and hybrid basalt fiber–reinforced polymer/carbon fiber–reinforced polymers), and number of layers (0, 1, and 2). The test results showed that the compressive strengths of confined specimens increased by 20%–71% for circular columns and by 23%–41% for square columns. Similarly, the ultimate strains improved by 49%–296% for circular specimens and by 45%–145% for square specimens. The two-layer basalt fiber–reinforced polymer jacket had the best confinement effect, whereas the confining effect of bidirectional basalt fiber–reinforced polymer wrapping was relatively lower than that of unidirectional basalt fiber–reinforced polymer wrapping. Moreover, both the strength and ultimate strain of confined concrete improved with increasing number of basalt fiber–reinforced polymer layers. Finite element numerical models were also developed and verified by experimental results, and then the stress distributions of basalt fiber–reinforced polymer jackets and cross-sectional concrete were presented. Based on the test results and experimental data from several existing studies, modified strength and ultimate strain models were further developed for basalt fiber–reinforced polymer-confined circular and square columns.

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