Shear behavior of two-span fiber reinforced concrete beams

Krassowska, Julita; Kosior‐Kazberuk, Marta; Berkowski, Piotr

doi:10.1016/j.acme.2019.09.005

Cited by 12 publications

(8 citation statements)

References 24 publications

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“…The experimental dataset in this study was collected from previously published works discussing about the shear strength of the simply supported beam (ZHANG HZ 2005;Magureanu et al 2010;Ji et al 2011;Baby et al 2014;Xu et al 2014;Kamal et al 2014;Zhou JM and Chen S 2015;Hou et al 2015;Jin et al 2015;Lim and Hong 2016;Pansuk et al 2017;Smarzewski 2018;Yousef et al 2018;Mészöly and Randl 2018;Hasgul et al 2019;Zheng et al 2019;Krassowska et al 2019;Qi et al 2020;Wang et al 2020). The typical RC beam with stirrups and its geometric parameters are illustrated in Fig.…”

Section: Data Constructionmentioning

confidence: 99%

“…Although there is little difference between UHPC and normal concrete in the ratio of tensile strength to compressive strength. The addition of steel fibers has greatly affected the tensile strength of UHPC while almost no influence on the compressive strength (Hassan et al 2012;Krassowska et al 2019). It is noteworthy that most of the formulas in the codes have been tested on the limited data which is just an extension of the existing empirical formulas for the shear strength of medium and high strength concrete beams, without fully considering and utilizing the ultra-high mechanical properties of ultra-high strength concrete.…”

Section: Introductionmentioning

confidence: 99%

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Modeling shear strength of medium- to ultra-high-strength concrete beams with stirrups using SVR and genetic algorithm

Jiang

Liang

2021

Soft Comput

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This paper presents a data-driven machine learning approach of support vector regression (SVR) with genetic algorithm (GA) optimization approach called SVR-GA for predicting the shear strength capacity of medium-to ultra-high strength concrete beams with longitudinal reinforcement and vertical stirrups. 148 experimental samples collected with different geometric, material and physical factors from literature were utilized for SVR-GA with 5-fold cross validation. Shear influence factors such as the stirrup spacing, the beam width, the shear span-to-depth ratio, the effective depth of the beam, the concrete compressive and tensile strength, the longitudinal reinforcement ratio, the product of stirrup ratio and stirrup yield strength were served as input variables. The simulation results show that the predicted shear strength of SVR-GA model can achieve high accuracy based on testing set with a coefficient of determination (R 2 ) of 0.9642, root mean squared error (RMSE) of 1.4685 and mean absolute error (MAE) of 1.0216 superior to that for traditional SVR model with 0.9379, 2.0375 and 1.4917. The sensitivity analysis reveals that the most important variables affecting the prediction of the shear strength are shear span-to-depth ratio, concrete compressive strength, reinforcement ratio and the product of stirrup ratio and stirrup yield strength. Three-dimensional input/output maps can vividly reflect the nonlinear variation of the shear strength with the two coupling variables. All in all, the proposed SVR-GA model presents an effective and accurate artificial intelligence technology for modeling the shear strength of ultra-high strength concrete beams with stirrups.

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Section: Data Constructionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling shear strength of medium- to ultra-high-strength concrete beams with stirrups using SVR and genetic algorithm

Jiang

Liang

2021

Soft Comput

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“…The development of measurement technologies is positively influencing the diagnosis of building structures. Modern testing methods such as digital image correlation [ 19 , 20 , 21 ], as well as laser scanning [ 22 , 23 ] and ultrasonic methods [ 24 , 25 ], allow for non-invasive monitoring of structures. Non-destructive testing of concrete elements has been popularised in [ 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Diagnostics of the RC Roofing Structure of the 100-Year-Old Municipal Theatre Facility

2022

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Reinforced concrete has been a widely used material for the construction of buildings for many decades. However, with the passage of time, the material characteristics and connection of structural elements gradually degrade. Development in measurement technology makes it possible to efficiently obtain data on the current state of the structure and material characteristics using non-destructive methods, with limited or no destructive testing. The paper presents the analysis of the condition of the reinforced concrete roof of a 100-year-old theatre building in terms of its further use after planned modernisation. The tests carried out in situ as well as the computational analysis of structure are described. Based on the test results, the current load-bearing capacity was assessed and the limit state conditions were checked. Limitations on the accuracy of the non-destructive test results in relation to the destructive test results were formulated. Options for the strengthening reinforced concrete beams with regard to structural and technological considerations were analysed.

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“…Las citadas normativas consideran la capacidad resistente de las fibras en función de las resistencias residuales a tracción por flexión denominadas fR1 y fR3. Sin embargo, para el cálculo de elementos sometidos a esfuerzos diferentes, como a cortante todavía se producen discrepancias a la hora de aceptar como válidas estas resistencias residuales (Conforti et al, 2020, Cuenca et al, 2015, Krassowska et al, 2019.…”

Section: Introductionunclassified

Teoría de corte-fricción aplicada al hormigón reforzado con fibras de acero

Iranzo¹,

Gálvez²,

Alberti³

et al. 2021

Congreso Latino-Americano De Patología De Construcción

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RESUMENEl hormigón reforzado con fibras de acero (HRFA) puede tener carácter estructural si cumple los requisitos establecidos por las normas de hormigón estructural basadas en resistencias residuales en ensayos de fractura a flexión. Sin embargo, para fractura a cortante el uso de dichas resistencias sigue estando cuestionado. Por esto los mecanismos resistentes de engranamiento de áridos y efecto pasador de la armadura conforme a la teoría de corte-fricción en HRFA sigue siendo objeto de estudio. Cabe recordar que las fibras mejoran el comportamiento del material frente a tensiones de corte en una grieta ya que cosen los labios de la fisura, reduciendo su apertura y aumentando el rozamiento del material. Con estos antecedentes, se diseñó y desarrolló una campaña experimental sobre HRFA en probetas tipo "push-off" sometidas a esfuerzos de corte directo para la obtención de los desplazamientos relativos entre los lados de las fisuras y así estudiar la validez de la teoría de corte-fricción desarrollada por Walraven. Del estudio comparativo entre los resultados experimentales y el modelo analítico de corte-fricción se concluye que el modelo analítico propuesto es apto al aplicarlo al comportamiento del HRFA, una vez creada la fisura de cortante, reproduciendo de forma adecuada los desplazamientos normales y tangenciales en la fisura sometida a tensiones tangenciales.Palabras clave: Teoría de corte-fricción, hormigón reforzado con fibras de acero, esfuerzo cortante, ensayos "push-off", deslizamiento a cortante.

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Shear behavior of two-span fiber reinforced concrete beams

Cited by 12 publications

References 24 publications

Modeling shear strength of medium- to ultra-high-strength concrete beams with stirrups using SVR and genetic algorithm

Modeling shear strength of medium- to ultra-high-strength concrete beams with stirrups using SVR and genetic algorithm

Diagnostics of the RC Roofing Structure of the 100-Year-Old Municipal Theatre Facility

Teoría de corte-fricción aplicada al hormigón reforzado con fibras de acero

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