Performance of Fibre Reinforced Concrete Structures - Modelling of Damage and Reliability

2016 ◽  
Vol 711 ◽  
pp. 690-697
Author(s):  
Radomír Pukl ◽  
Tereza Sajdlová ◽  
Jan Červenka ◽  
Vladimir Červenka
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Construction Material ◽  
Experimental Investigations ◽  
Fibre Reinforced Concrete ◽  
Shear Cracks ◽  
Element Analysis ◽  
Steel Fibre Reinforced Concrete ◽  
Model Code ◽  
Model Code 2010

Steel fibre reinforced concrete (FRC) has higher ductility, it can save amount of convention reinforcement, labour and in consequence costs of the structure. However, broader use of SFRC as construction material is limited among others by lack of design codes. According to the previous study, reliability and safety of ordinary reinforced engineering can be verified using non-linear finite element analysis and several safety formats that are proposed in fib Model Code 2010. In the presented paper, safety formats are applied for fibre reinforced structures such as tunnel lining precast segment and individual approaches are compared. As tensile and shear cracks or compressive crushing can develop in the fibre reinforced concrete under severe conditions, the design combining numerical and experimental investigations together with safety formats is appropriate method how to obtain safe and reliable structure. Finite element method and advanced material models taking into account FRC properties such as shape of tensile softening branch, high toughness and ductility are described in the paper. Since the variability of FRC material properties is rather high, full probabilistic analysis seems to be the most appropriate format for evaluation of structural performance, reliability and safety.

scholarly journals Experimental and Analytical Analysis of Creep of Steel Fibre Reinforced Concrete

2017 ◽  
Author(s):  
Darko Nakov
Keyword(s):  
Reinforced Concrete ◽  
Service Life ◽  
Steel Fibre ◽  
Experimental Results ◽  
Fibre Reinforced Concrete ◽  
Steel Fibres ◽  
Steel Fibre Reinforced Concrete ◽  
Model Code ◽  
Creep Coefficient ◽  
Model Code 2010

To find out the influence of different fibre dosages on the creep of SFRC (Steel fibre reinforced concrete), an experiment was carried out at the Faculty of Civil Engineering–Skopje. The experiment involved 9 specimens manufactured with concrete class C30/37 and reinforced with different amount of fibres (0, 30 and 60 kg/m3). According to the experimental results obtained up to the age of 400 days, the addition of steel fibres had an influence on the creep strains (a decrease of up to 12%). Based on the experimental results, analytical analyses of creep were performed by use of the B3 model and fib Model Code 2010. The analyses were prolonged up to the estimated age of service life of structures of 100 years. According to the B3 model, at the age of 100 years, the decrease of the creep coefficient is 11.1% in the case of the SFRC type C30/37 FL 1.5/1.5, while in the case of C30/37 FL 2.5/2.0, it is 17.8%, when compared to C30/37.

scholarly journals A NONLINEAR FINITE ELEMENT ANALYSIS OF PRECAST INDUSTRIALISED BUILDING SYSTEM BEAM UNDER FLEXURAL TEST

2019 ◽  
Vol 81 (3) ◽  
Author(s):  
Chun-Chieh Yip ◽  
Jing-Ying Wong ◽  
Ka-Wai Hor
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Concrete Beam ◽  
Failure Modes ◽  
Reinforced Concrete Beam ◽  
Shear Cracks ◽  
Flexural Test ◽  
Element Analysis ◽  
Failure Behaviour

Software simulation enables design engineers to have a better picture of possible structural failure behaviour and determine the accuracy of a design before the actual structural component is fabricated. Finite element analysis is used to simulate the behaviour of the reinforced concrete beam under the flexural test. During the flexural test, results are recorded for both simulation and experimental tests. By comparing the results, beam displacement, crack patterns, and failure modes can be studied with better accuracy. The accuracy percentage for yield load and ultimate load between the two tests results were 94.12 % and 95.79 %, respectively, whereas the accuracy percentage for elastic gradient before the yielding stage was 81.08 %. The behaviour between simulation and laboratory models described is based on crack pattern and failure mode. The progression of von Mises (VM) stresses highlighted the critical areas of the reinforced concrete beam and correlation between the experimental specimen, in terms of flexural cracks, shear cracks, yielding of tension reinforcement, and the crushing of concrete due to compressive stress. This paper concludes that simulation can achieve a significant accuracy in terms of loads and failure behaviour compared to the experimental model.

scholarly journals Reliability-based assessment of the partial factor for shear design of fibre reinforced concrete members without shear reinforcement

2021 ◽  
Vol 54 (5) ◽  
Author(s):  
Jesús Miguel Bairán ◽  
Nikola Tošić ◽  
Albert de la Fuente
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Shear Resistance ◽  
Fibre Reinforced Concrete ◽  
Shear Reinforcement ◽  
Model Code ◽  
Shear Design ◽  
Model Code 2010 ◽  
Partial Factor ◽  
Failure Probabilities

AbstractFibre reinforced concrete (FRC) is increasingly used for structural purposes owing to its many benefits, especially in terms of improved overall sustainability of FRC structures relative to traditional reinforced concrete (RC). Such increased structural use of FRC requires safe and reliable models for its design in ultimate limit states (ULS). Particularly important are models for shear strength of FRC members without shear resistance due to the potential of brittle failure. The fib Model Code 2010 contains a model for the shear strength of FRC members without shear reinforcement and the same partial factor accepted for RC structures is accepted for FRC elements. This approach, however, is potentially on the unsafe side since the uncertainties of some design-determining mechanical properties of FRC (i.e., residual flexural strength) are larger than those for RC. Therefore, in this study, a comprehensive reliability-based calibration of the partial factor γc for the shear design of FRC members without shear reinforcement according to the fib Model Code 2010 model is performed. As a first step, the model error δ is assessed on 332 experimental results. Then, a parametric analysis of 700 cases is performed and a relationship between the target failure probability βR and γc is established. The results demonstrate that the current model together with the prescribed value of γc = 1.50 does not comply with the failure probabilities accepted for the different consequences of failure of FRC members over a 50-year service life. Therefore, changes to the shear resistance model are proposed in order to achieve the target failure probabilities.

Numerical Modelling for Shear Strength Evaluation of a High Performance Fibre Reinforced Concrete Beam According to fib Model Code 2010 Guidelines

2017 ◽  
Author(s):  
Rodolfo Giacomim Mendes de Andrade ◽  
Magno Teixeira Mota ◽  
Michèle Schubert Pfeil ◽  
Romildo Dias Toledo Filho ◽  
Ronaldo Carvalho Battista ◽  
...  
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Numerical Modelling ◽  
High Performance ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Fibre Reinforced Concrete ◽  
Model Code ◽  
Model Code 2010 ◽  
High Performance Fibre
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