Design-oriented approach to determine FRC constitutive law parameters considering the size effect

Galeote, Eduardo; Blanco, Ana; Fuente, Albert de la

doi:10.1016/j.compstruct.2020.112036

Cited by 9 publications

(7 citation statements)

References 46 publications

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“…79 Thereafter, the mean value of curvatures is to be obtained by means of interpolation. Adapting this approach to HRC solution, the section model described previously (Figure 6) along with the multi-layer sectional approach (inverse analysis) 80 may be applied to estimate the curvatures at the governing sections subjected to the given bending moments with further evaluation of the produced deflections in accordance with Figure 8d.…”

Section: Instantaneous Deformationsmentioning

confidence: 99%

A limit state design approach for hybrid reinforced concrete column‐supported flat slabs

Aidarov

Tošić

Antequera

2022

Structural Concrete

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Hybrid reinforced technology (combination of steel reinforcing bars and fibers) can be considered as a competitive alternative to the already existing solutions for the construction of column-supported flat slabs. Constructed hybridreinforced buildings prove that hybrid solutions have sufficient bearing capacity to maintain structural integrity despite being exposed to high stress levels, thereby providing a beneficial solution in terms of toughness, ductility, and sustainability performance. However, the lack of design-oriented recommendations based on the accepted limit state format for dealing with both serviceability and ultimate limit states slows down the wider implementation of this technology. Considering the above-mentioned, this article presents a simplified design-oriented method that covers the evaluation of the structural response of hybrid reinforced concrete column-supported flat slabs in terms of flexural strength, cracking, and instantaneous deformations. Two hybrid reinforced alternatives for a given flat slab are studied by means of the proposed approach. Furthermore, a nonlinear finite element analysis is carried out in order to evaluate the effectiveness of the developed simplified method. Based on the achieved results, its suitable accuracy and precision can be pointed out. This outcome may motivate current practitioners to consider hybrid reinforced concrete solutions as a possible alternative during the design of residential and office buildings.

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Section: Instantaneous Deformationsmentioning

confidence: 99%

A limit state design approach for hybrid reinforced concrete column‐supported flat slabs

Aidarov

Tošić

Antequera

2022

Structural Concrete

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“…strength of the FRC, resulting from a cross-sectional analysis, for instance; (2) defining the design-oriented constitutive equation of the FRC [53][54][55] for dealing with cross-sectional and/or finite element analyses; (3) deriving models for reliability analyses and partial safety factor calibration [56][57][58] ; and (4) establish correlations between characterization tests (i.e., 3PBTs in notched beams, double punching, DEWS, Montevideo tests 59,60 ) for FRC. 33,[61][62][63] As an example of the utility of the database, in Figure 5a,b the relationship between volume of fibers (per volume of concrete, V f ) and residual flexural strength of the FRC for a crack mouth opening displacement (CMOD) of 0.5 mm (f R1 ) as well as the relationship between f R3 (CMOD = 2.5 mm) and f R1 , respectively, are presented for steel and synthetic macrofibres.…”

Section: A Materials Application Of the Fib Repository: Residual Flex...mentioning

confidence: 99%

“…At the beginning it is only containing certain test data performed at the Universitat Politècnica de Catalunya (UPC BarcelonaTECH) under the scope of several research projects. The authors of the database aims at providing researchers and practitioners to (not exhaustive): (1) predict and quantify, having established the type and material of the fiber and compressive concrete strength, the required amount of fibers to reach a target residual flexural tensile strength of the FRC, resulting from a cross‐sectional analysis, for instance; (2) defining the design‐oriented constitutive equation of the FRC 53–55 for dealing with cross‐sectional and/or finite element analyses; (3) deriving models for reliability analyses and partial safety factor calibration 56–58 ; and (4) establish correlations between characterization tests (i.e., 3PBTs in notched beams, double punching, DEWS, Montevideo tests 59,60 ) for FRC 33,61–63 …”

Section: A Materials Application Of the Fib Repository: Residual Flex...mentioning

confidence: 99%

Rethinking databases: The fib project for a connected data repository

Fernández-Ordóñez

Ruiz

Tošić

et al. 2023

Structural Concrete

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The need for reliable test data to verify scientific theories together with the necessity to calibrate code‐oriented expressions and their level of safety have pushed researchers to develop test databases. Such databases collect the work of multiple independent scientific initiatives compiling experimental evidences on similar test configurations but with different parameters such as geometry, size of the component tested, boundary conditions, and/or mechanical properties of the materials. Such databases, usually collected for specific purposes, have traditionally faced maintenance, and especially consistency issues. Also, they have given rise to conflicting values due to different interpretations of the same data entries in databases elaborated by different researchers. In addition, such databases are frequently designed and configured to serve for one purpose, although their data could be used in multiple manners. Recent developments regarding machine learning and artificial intelligence have opened the door to exploiting historically collected test results by data mining techniques. In an effort to improve the current situation concerning databases, the fib has launched a wide and open initiative on test data management. It consists of a common data structure, sufficiently flexible to serve for multiple purposes, hosting very different test setups, and meant to be used for cross analyses of data. This allows reusing data originally developed for one purpose to analyze other aspects, enhancing the value of current experimental work. Also, a consistent management structure is defined taking advantage of the fib network, with database editors, collectors and users, allowing for a transparent and documented peer‐review process while incorporating new test data. This paper presents the main basis grounding the test data management as well as details on the first two completed applications, referring to fiber‐reinforced concrete (material data) and to punching of slab‐column connections (structural response), showcasing the framework versatility and universality.

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“…Although the use of fibre-reinforced concrete (FRC) is more and more popular, there are exiguous investigations on the size effect of FRC [4][5][6][7][8][9]. In fact, most of the existing model codes and guidelines of FRC constitutive laws (e.g.…”

Section: A R C H I T E C T U R E C I V I L E N G I N E E R I N G E N ...mentioning

confidence: 99%

Size Effect of Synthetic Fibre Reinforced Concrete – Investigation using a Semi-Discrete Analytical Beam Model

Tóth,

Pluzsik

2023

Architecture, Civil Engineering, Environment

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The size effect is a well-known characteristic of concrete structures. However, in the case of fibre-reinforced concrete (FRC), this issue is not thoroughly explored. Most design recommendations of FRC neglect the size effect or handle the behaviour of FRC structures in case of different structural sizes similar to plain concrete structures (assuming FRC is a homogeneous material). The aim of this paper is to show that the size effect of FRC can be divided, the share of the concrete matrix and the fibres in the size-dependent properties is separable. For the size effect research fifteen synthetic macro fibre reinforced concrete and six plain concrete beam specimens were prepared and tested in three different sizes and then evaluated with the semi-discrete analytical (SDA) model. The analysis of the experimental specimens has shown that the size effect significantly influences the concrete material in the case of FRC with softening material behaviour, but the residual loadbearing capacity which mainly arise from the local bridging effect of fibres is essentially independent of the structural size. It is also shown in this paper that the two defining parameters of the SDA model is independent of the structural size, so the model provides an excellent tool in case of the design of real-sized FRC structures.

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Design-oriented approach to determine FRC constitutive law parameters considering the size effect

Cited by 9 publications

References 46 publications

A limit state design approach for hybrid reinforced concrete column‐supported flat slabs

A limit state design approach for hybrid reinforced concrete column‐supported flat slabs

Rethinking databases: The fib project for a connected data repository

Size Effect of Synthetic Fibre Reinforced Concrete – Investigation using a Semi-Discrete Analytical Beam Model

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