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Shear strength estimation of a FRP-strengthened RC beam: A comparison between an artificial neural network and guideline equations

Nezaminia Hamid

Computer Methods in Materials Science

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2024

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Vol. 24, No. 3

5--32

EN

In recent years, several experimental tests have been conducted on the shear strengthening of reinforced concrete (RC) beams strengthened by fiber-reinforced polymer (FRP) systems. In this regard, some equations have also been proposed to estimate the shear strength of beams reinforced with FRP systems. The aim of this study is to investigate the estimation of the shear strength of beams reinforced with FRP systems using an artificial neural network model. For this purpose, a comprehensive and extensive review of forty published articles has been carried out to compile data on 304 RC beams strengthened with externally bonded FRP systems to improve their shear strength. These laboratory results have been used to provide a database for the ANN model to evaluate the shear behavior. The input to the ANN model consists of the 11 variables, including the sectional geometry, reinforcement ratio, FRP ratio, and the characteristics of concrete, steel reinforcement, and composite material, while the output variable is the shear strength of the FRP-strengthened RC beam. In order to evaluate the effectiveness of the neural network model in estimating the shear capacity of RC beams, the results obtained from the neural network model are compared with the equations from the Publication No. 345 and ACI 440.2R guidelines. The comparison of the results shows that the predictive power of the proposed model is much better than the experimental guidelines. Specifically, the mean absolute relative error (MARE) criteria for the studied data is 13%, 34% and 39% for the ANN model, ACI 440.2R guideline and the Publication No. 345 guideline, respectively.

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Calculation of the strength of reinforced concrete beams strengthened with composite materials

Borysiuk Oleksandr, Trach Roman

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

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2023

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Vol. 32, No. 1

53--68

EN

Currently, in view of the previous theoretical and experimental researches, the regulatory documents for the calculation of reinforced concrete elements strengthened by composite materials and the calculation and design of fiber reinforced concrete structures are in force in Ukraine and in the world. Simultaneous strengthening of the compressed and tensile zones has not been sufficiently studied. Therefore, further research of reinforced concrete elements, strengthened by modern and highly efficient materials, such as steel fiber concrete and composite materials, is of great theoretical and practical importance. The urgency of the study is due to the obvious need to improve the method of calculation of the reinforced concrete bending elements after simultaneously strengthening compressed and tensile zones.

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Mosty kompozytowe - pieśń przyszłości czy teraźniejszość?

Sobczyk Bartosz, Pyrzowski Łukasz, Chróścielewski Jacek, Miśkiewicz Mikołaj

Mosty

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2022

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nr 4

31--35

PL

W artykule przedstawiono aktualne problemy i wyzwania związane z projektowaniem oraz budową mostów z kompozytów polimerowych zbrojonych włóknami (FRP). Omówiono i przeanalizowano zagadnienia utrudniające rozwój i powszechność zastosowań tego typu konstrukcji. Aby udowodnić, że możliwe są efektywne projektowanie, produkcja i analiza mostów FRP, przedstawiono wybrane doświadczenia autorów artykułu w tym zakresie.

EN

This paper presents current problems and challenges related to the design and construction of bridges made of fiber-reinforced polymers (FRP). The issues hindering the development and expansion of structures of such a type are deeply analysed and discussed. It is emphasised that engineers and manufacturers are able to design and produce FRP bridges efficiently. Unfortunately, the transportation agencies are rather not convinced that the application of FRP in the construction of bridges is the right thing, mostly because the knowledge about FRP composite bridges is rather not widespread. Moreover, the way of thinking about FRP bridges should also change, if we want more of them to be erected. FRP composite bridges allow for sustainability in which social, environmental and economic aspects are treated equally. Regretfully, sustainability is still not well recognised, especially in Eastern Europe. In order to prove that the efficient design, production and analysis of FRP bridges are possible, some experiences of the paper’s authors in this field are presented.