Number of tests and corresponding error in concrete fatigue

Ortega, José-Fernán Martínez; Ruiz, Gonzalo; Yu, Rena C.; García, Nelson Afanador; Tarifa, Manuel; Poveda, Elisa; Zhang, Xiaoxin; Evangelista, Francisco

doi:10.1016/j.ijfatigue.2018.06.022

Cited by 49 publications

(13 citation statements)

References 27 publications

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“…For each mixture, five samples were prepared for each stress level to ensure the reliability of the results. A previous study by Ortega et al [46] stated that the observed error in experimental fatigue life is related to the number of fatigue tests performed and the desired safety level, i.e., the higher the number of performed tests, the lower the potential error would exist in the result. This study aims to evaluate the effect of RTPF on the trend of fatigue behaviour as a pioneer, in order to further explore the feasibility of applying RTPF in cementitious materials.…”

Section: Compressive Strengthmentioning

confidence: 99%

Flexural fatigue behaviour of recycled tyre polymer fibre reinforced concrete

Chen

Zhong

Zhang

2020

Cement and Concrete Composites

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The utilization of recycled tyre polymer fibre (RTPF) into concrete production is feasible to promote sustainable development and mitigate environmental pollution of global landfilled waste tyres. This paper for the first time presents an experimental study on flexural fatigue behaviour of concrete reinforced with mixed RTPF considering different fibre dosages (i.e., 1.2, 2.4, 4.8 and 9.6 kg/m 3). Results indicate that with the presence of RTPF, the flexural strength of concrete was increased by 3.6-9.6%. The fatigue life of all mixtures followed the two-parameter Weibull distribution and can be accurately predicted using the developed double-logarithm fatigue equations. Concrete reinforced with 4.8 kg/m 3 of RTPF presented the longest fatigue life under different failure probabilities. RTPF and polypropylene fibre (PPF) reinforced concrete exhibited similar fatigue failure mechanisms. 0.2-0.4% Vf of RTPF could substitute around 0.1% Vf of PPF in concrete considering overall static, dynamic and fatigue performance.

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Section: Compressive Strengthmentioning

confidence: 99%

Flexural fatigue behaviour of recycled tyre polymer fibre reinforced concrete

Chen

Zhong

Zhang

2020

Cement and Concrete Composites

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“…Thus, The amount of 500,000 random values were generated as samples of each variable using latin hypercube method within Monte Carlo simulation in order to obtain probabilistic outcomes for R Nt . This number of samples was the amount necessary to have a convergence of the output variance of the response (Ortega et al, 2018). Therefore, the reliability analysis could be based on a converged solution of the Monte Carlo simulations.…”

Section: Probabilistic Simulationsmentioning

confidence: 99%

Reliability and uncertainty quantification of the net section tension capacity of cold-formed steel angles with bolted connections considering shear lag

Borges

Paula

Evangelista

et al. 2020

Advances in Structural Engineering

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In cold-formed steel members under tension and connected with bolts, the resistance capacity of the net section should be calculated, taking into account the shear lag phenomenon. This is done through the net section reduction coefficient, Ct. Different Standards show different equations for Ct. In this work, experimental laboratory data of cold-formed steel angles from the authors are used for the evaluation of the accuracy of the predictions of the net section capacity of members under tension. Such predictions are given by the equations of AISI, Eurocode-3, Brazilian standard NBR 14762, and also by a predictive equation previously proposed by the authors. The paper shows how each equation predicts the tension member resistance capacity in front of the experimental data. Most of the equations in the design standards have good predictions when more sections of the steel angles are connected. The results show that the AISI standard presented the best resistance capacity prediction and lower standard deviations of the output response upon uncertainty.

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“…Current studies have suggested that fatigue life generally obeys a lognormal distribution; however, in recent years, some studies proposed very sophisticated modeling approaches by two-parameter or three-parameter Weibull distribution from statistical viewpoint [18,23,25,26] to simulate the probability distribution of fatigue life. According to the Weibull distribution theory, the safe life or the minimum safe life in the range of an extremely high guarantee rate (99-100%) is still in agreement with the actual situation.…”

Section: Establishing the Fatigue Equation Based On The Weibull Distrmentioning

confidence: 99%

“…They established the prediction model for the indoor fatigue life of different structural material specimens. Ortega et al [25] conducted random samples of 100 compressive fatigue test of concrete, the experimentally-fitted probabilistic distributions by failure probability and logN results found that an error in terms of fatigue life that depends on the number of tests. Through statistical resampling, this relationship has been obtained for the two-parameter Weibull probabilistic distribution fitted to a set of 100 tests results.…”

Section: Introductionmentioning

confidence: 99%

Standardization of Fatigue Characteristics of Cement-Treated Aggregate Base Materials under Different Stress States

Xie

Tang

et al. 2018

Applied Sciences

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In this study, to decrease the evaluation uncertainty of the fatigue characteristics of cement-treated aggregate base materials under different test conditions, unconfined compressive, indirect tensile, flexural tensile strength tests and fatigue tests of these base materials with different cement content and at different curing times were carried out. The Weibull distribution was employed to analyze fatigue test results. The standardization model of fatigue characteristics for cement-treated aggregate base materials under different stress states was established. Based on the interval analysis theory, the fatigue characteristic model under different stress states was established using interval parameters. Results revealed that the curing time and cement content considerably affect the strength and fatigue characteristics of cement-treated aggregate base materials, and with increasing cement content and curing time, the fatigue resistance of cement-treated aggregate base materials can be improved. Clear differences between the fitting parameters a and b of the S-N fatigue equation of cement-treated aggregate base materials under different stress states were observed, which can be eliminated by using the analysis method based on the Weibull distribution and the standardization model, and a unified expression for the cement-treated aggregate base materials under different test conditions was realized. A Standardization model of fatigue characteristics based on the interval analysis new method could solve several problems such as inadequate sampling representation, low precision, and insufficient stability of test equipment; thus, the errors caused by materials, structures, the environment, and loads can be reduced, making the fatigue life interval more reasonable and scientific compared to the point numerical fatigue life. Regression parameters a and be were in intervals [9.0, 10.6] and [9.9, 11.3], respectively, and parameters a and b were similar, which improve the test accuracy and reduce the data error.

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Number of tests and corresponding error in concrete fatigue

Cited by 49 publications

References 27 publications

Flexural fatigue behaviour of recycled tyre polymer fibre reinforced concrete

Flexural fatigue behaviour of recycled tyre polymer fibre reinforced concrete

Reliability and uncertainty quantification of the net section tension capacity of cold-formed steel angles with bolted connections considering shear lag

Standardization of Fatigue Characteristics of Cement-Treated Aggregate Base Materials under Different Stress States

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