Artykuły w czasopismach: „Concrete Fatigue”

1

Liu, Hanbing, Guobao Luo, Peilei Zhou, Haibin Wei, Wenjun Li i Di Yu. "Flexural-Fatigue Properties of Sustainable Pervious Concrete Pavement Material Containing Ground Tire Rubber and Silica Fume". Sustainability 11, nr 16 (18.08.2019): 4467. http://dx.doi.org/10.3390/su11164467.

Pełny tekst źródła

Streszczenie:

With the development of urbanization, pervious concrete has been increasingly used in urban road pavement structures. The objective of this paper was to investigate the effect of stress levels and modifier (ground tire rubber and silica fume) on the fatigue life of pervious concrete and establish the fatigue equations with different survival probabilities. In order to improve the deformability of pervious concrete without sacrificing its strength, ground tire rubber and silica fume were added into pervious concrete. Two kinds of pervious concrete, control pervious concrete and ground tire rubber and silica fume modified pervious concrete, were made in the laboratory. The pervious concrete beam specimens of 100 × 100 × 400 mm were casted, and the static flexural strength and flexural strain of the two kinds of pervious concrete were tested. The fatigue lives of two pervious concretes were tested using MTS fatigue testing machine under four different stress levels (0.85, 0.80, 0.75, and 0.70). The fatigue life was analyzed by two-parameter Weibull distribution. The parameters of Weibull distribution were determined by graphical method, maximum likelihood method and moment method. The Kolmogorov–Smirnov test was used to test the Weibull distribution and the fatigue equations under different survival probabilities were established. The results showed that ground tire rubber and silica fume modified pervious concrete had better deformability while ensuring strength compared to control pervious concrete. The addition of ground tire rubber and silica fume improved the fatigue life of pervious concrete. The two-parameter Weibull distribution was suitable to characterize the fatigue characteristics and predict the fatigue life of pervious concrete. Fatigue equations with different survival probabilities were a good guide for pervious concrete design.

Style APA, Harvard, Vancouver, ISO itp.

2

Chen, Bo, Liping Guo i Wei Sun. "Fatigue Performance and Multiscale Mechanisms of Concrete Toughened by Polymers and Waste Rubber". Advances in Materials Science and Engineering 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/684207.

Pełny tekst źródła

Streszczenie:

For improving bending toughness and fatigue performance of brittle cement-based composites, two types of water-soluble polymers (such as dispersible latex powder and polyvinyl alcohol powder) and waste tire-rubber powders are added to concrete as admixtures. Multiscale toughening mechanisms of these additions in concretes were comprehensively investigated. Four-point bending fatigue performance of four series concretes is conducted under a stress level of 0.70. The results show that the effects of dispersible latex powder on bending toughness and fatigue life of concrete are better than those of polyvinyl alcohol powder. Furthermore, the bending fatigue lives of concrete simultaneously containing polymers and waste rubber powders are larger than those of concrete with only one type of admixtures. The multiscale physics-chemical mechanisms show that high bonding effect and high elastic modulus of polymer films as well as good elastic property and crack-resistance of waste tire-rubber powders are beneficial for improving bending toughness and fatigue life of cementitious composites.

Style APA, Harvard, Vancouver, ISO itp.

3

Cao, Qing Yu, Wei Sun i Li Ping Guo. "Study on Gas Anti-Permeability of Fiber Concrete under Fatigue Loading". Advanced Materials Research 243-249 (maj 2011): 793–96. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.793.

Pełny tekst źródła

Streszczenie:

Cracking is the most common damage in the secondary lining concrete because of its continuous thin-walled structure, potential surrounding rock pressure and poor curing conditions. In order to improve the fatigue and gas perimeability resistance of concrete and to reduce the responding costs, four series modern concretes including ultra-fine pozzolanic powder and organic fibers are prepared and investigated. The optimized modern secondary lining concrete is determined as the concrete including 0.08% or 0.1% volume fractions of ultra-fine organic fiber (UF), based on the test results of fatigue life and coefficient of gas-permeability under fatigue loading. The result show fiber concrete is positive for enhancing the fatigue and gas permeability resistance and can apply for the tunnel secondary lining.

Style APA, Harvard, Vancouver, ISO itp.

4

Raue, Erich, i Enrico Tartsch. "EXPERIMENTAL RESULTS OF FATIGUE AND SUSTAINED LOAD TESTS ON AUTOCLAVED AERATED CONCRETE". JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 11, nr 2 (30.06.2005): 121–27. http://dx.doi.org/10.3846/13923730.2005.9636341.

Pełny tekst źródła

Streszczenie:

The fatigue strength of concrete is lower than its static strength. An attempt was made to accelerate the destabilisation process due to microcracking by the application of fatigue loads. The aim of this was to get ready access to information about concrete's sustained loading strength. The fatigue strength of autoclaved aerated concrete (AAC) was observed by applying cyclic loads to unreinforced cylinders. AAC was found to be less sensitive to fatigue loads than lightweight concrete. The fatigue tests were supplemented by tests using sustained loads. It could be assumed that the behaviour under both static and fatigue loads was comparable with that of lightweight and normal concrete. A substantial influence of load duration was found, especially at high load levels.

Style APA, Harvard, Vancouver, ISO itp.

5

Chuong, Le Hong, Ung Quoc Trang i Ngo Lam. "Asphalt concrete testing device: Studying and designing based on the properties of asphalt concrete". Journal of Science and Technology in Civil Engineering (STCE) - NUCE 13, nr 1 (31.01.2019): 60–65. http://dx.doi.org/10.31814/stce.nuce2019-13(1)-06.

Pełny tekst źródła

Streszczenie:

With the purpose of obtaining the shear strength parameters (friction angle, φ, and cohesion, c) of asphalt concretes. At the present time, almost the testing devices were designed based on the condition of the vehicle's load when they are moving on the pavement structure. That means, the fatigue resistance of the interfaces was determined through the loads acting at the interfaces between layers are repetitive mechanical action of the moving vehicles. With that view, the ratio of the normal and shear fatigue loads of asphalt concrete was not considered in terms of the nature of the material. An asphalt concrete testing device is proposed based on the modification from AST-2 instrument and Shear Fatigue Test instrument. The main parameters of this device are calculated from the ratio of shear stress and normal stress at the fatigue of the asphalt concrete according to the Mohr-Coulomb failure criterion. Test results with asphalt specimens show that the device is stable, the acting vertical loads were smaller and more stable. Keywords: normal strength; shear stress; asphalt concrete; fatigue stresses. Received 4 December 2018, Revised 20 December 2018, Accepted 24 January 2019

Style APA, Harvard, Vancouver, ISO itp.

6

Tamayo, Pablo, Gilberto García Del Ángel, José A. Sainz-Aja, Ana I. Cimentada, Jesús Setién, Juan A. Polanco i Carlos Thomas. "Fatigue Behaviour of Concrete Using Siderurgical Aggregates". Applied Sciences 13, nr 4 (14.02.2023): 2439. http://dx.doi.org/10.3390/app13042439.

Pełny tekst źródła

Streszczenie:

The use of concrete with aggregates with reduced environmental impact, as is the case of concrete with siderurgical aggregates (recovered slags), will inevitably increase in the future, as a result of policies promoting development of more sustainable construction materials. These concretes offer an excellent response to static loads, but their behaviour under dynamic loads has not yet been studied. The aim of this study is to characterize the fatigue behaviour, in terms of fatigue limit, of a concrete with siderurgical aggregates by comparing it with an analogous conventional limestone concrete. This characterization was carried out using the Locati method, which stands out for its convenience, speed and low cost, with the feature of being carried out at a high frequency corresponding to the resonance frequency. Performing high-frequency tests has drastically reduced test times and thus costs. Likewise, the results obtained show that, using various criteria found in the literature, concrete with siderurgical aggregates has a higher fatigue limit in absolute terms (MPa), but a lower one in relative terms (% fc).

Style APA, Harvard, Vancouver, ISO itp.

7

Wilkes, W. Jack. "FATIGUE Concrete vs. Steel". PCI Journal 34, nr 4 (1.07.1989): 76–79. http://dx.doi.org/10.15554/pcij.07011989.76.79.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

8

Hobbs, R. E. "Fatigue of reinforced concrete". International Journal of Fatigue 14, nr 6 (listopad 1992): 410. http://dx.doi.org/10.1016/0142-1123(92)90230-a.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

9

Yan, Hui Qun, Qing Yuan Wang i Ning Yan. "Experimental Research on Fatigue Behavior of Recycled Aggregate Reinforcement Concrete Made from Building Scrap". Advanced Materials Research 339 (wrzesień 2011): 448–51. http://dx.doi.org/10.4028/www.scientific.net/amr.339.448.

Pełny tekst źródła

Streszczenie:

In consistent with sustaining development, circularly utilizing the scrap concrete was an important measure for country and human beings. With the development and extensive application of Recycled aggregate concrete (RAC), it, as a structure, certainly would be attacked by unfavorable environments and occurred destroy or invalidation, such as fatigue (vibration load of vehicle or equipment). But, its fatigue behavior is different from other concretes as a result of different property of the aggregate of recycled concrete and other concrete. In order to apply RAC more effectively, it is necessary to study its properties especially for those aggregates from earthquake-stricken area for post-earthquake reconstruction. Therefore, on the basis of experimental research, the fatigue behaviors and microstructure of recycled concrete are studied in this paper. The present paper deals with investigations on fatigue behavior of the axial and eccentric compression performance of recycled aggregate reinforcement concrete specimens with contain recycled aggregate proportion of 0%、50%、100%, when specimens were effected by constant amplitude sine wave fatigue load imposed from 110kN~190KN with 5Hz frequency. Then the expansion and diversification of RAC cracks were real time was watched. Based on the analysis of experiment results, it can be proved that it’s feasible to apply RAC to practical engineering.

Style APA, Harvard, Vancouver, ISO itp.

10

Adresi, Mostafa, Jean-Marc Tulliani, Giuseppe Lacidogna i Paola Antonaci. "A Novel Life Prediction Model Based on Monitoring Electrical Properties of Self-Sensing Cement-Based Materials". Applied Sciences 11, nr 11 (30.05.2021): 5080. http://dx.doi.org/10.3390/app11115080.

Pełny tekst źródła

Streszczenie:

Assessing the damage level in concrete infrastructures over time is a critical issue to plan their timely maintenance with proper actions. Self-sensing concretes offer new opportunities for damage assessment by monitoring their electrical properties and relating their variations to damage levels. In this research, fatigue tests were conducted to study the response of a self-sensing concrete under high-cycle dynamic loading. The concept of G-value was defined as the slope of the voltage response baseline of the self-sensing concrete over time that reflects the damage created under the fatigue-loading test. Based on this definition, log (G)–log (N) curves were obtained using a linear regression approach, with N representing the number of cycles during the fatigue tests. While traditional fatigue curves S-log (N) are used to estimate the remaining life under fatigue loading, log (G)–log (N) diagrams can be used to determine the damage level based on the voltage response of the self-sensing concrete as a function of the loading history. This finding can be useful for the estimation of the lifetime and remaining life of self-sensing concrete structures and infrastructure, eventually helping to optimize the related maintenance operations.

Style APA, Harvard, Vancouver, ISO itp.

11

Basaldella, Marco, Marvin Jentsch, Nadja Oneschkow, Martin Markert i Ludger Lohaus. "Compressive Fatigue Investigation on High-Strength and Ultra-High-Strength Concrete within the SPP 2020". Materials 15, nr 11 (26.05.2022): 3793. http://dx.doi.org/10.3390/ma15113793.

Pełny tekst źródła

Streszczenie:

The influence of the compressive strength of concrete on fatigue resistance has not been investigated thoroughly and contradictory results can be found in the literature. To date, the focus of concrete fatigue research has been on the determination of the numbers of cycles to failure. Concerning the fatigue behaviour of high-strength concrete (HPC) and, especially, ultra-high-strength concrete (UHPC), which is described by damage indicators such as strain and stiffness development, little knowledge is available, as well as with respect to the underlying damage mechanisms. This lack of knowledge has led to uncertainties concerning the treatment of high-strength and ultra-high-strength concretes in the fatigue design rules. This paper aims to decrease the lack of knowledge concerning the fatigue behaviour of concrete compositions characterised by a very high strength. Within the priority programme SPP 2020, one HPC and one UHPC subjected to monotonically increasing and cyclic loading were investigated comparatively in terms of their numbers of cycles to failure, as well as the damage indicators strain and stiffness. The results show that the UHPC reaches a higher stiffness and a higher ultimate strain and strength than the HPC. The fatigue investigations reveal that the UHPC can resist a higher number of cycles to failure than the HPC and the damage indicators show an improved fatigue behaviour of the UHPC compared to the HPC.

Style APA, Harvard, Vancouver, ISO itp.

12

Cai, Qiang, Ji Ming Kong i Ze Fu Chen. "Concrete Fatigue Life Characteristics of the Different Survival Rates in the Lateral Pressure Conditions". Advanced Materials Research 600 (listopad 2012): 250–55. http://dx.doi.org/10.4028/www.scientific.net/amr.600.250.

Pełny tekst źródła

Streszczenie:

Under cyclic loading of concrete structures, fatigue failure is the main failure modes of fatigue, which has become the fatigue design of concrete structure must be considered, then the concrete fatigue studies must clarify the fatigue life of concrete under different survival curve S-N curve. Based on the statistics of the two parameter Weibull distribution theory, obtain the concrete under different survival rates of fatigue life distribution, namely to improve survival, reduce the fatigue life; stress level is reduced, the fatigue life is increased; and has set up more than 50% under different survival rates of concrete fatigue equation.

Style APA, Harvard, Vancouver, ISO itp.

13

Yan, H. Q., i Qing Yuan Wang. "Experimental Research on Fatigue Behavior of Recycled Aggregate Reinforcement Concrete from Earthquake-Stricken Area". Advanced Materials Research 160-162 (listopad 2010): 906–9. http://dx.doi.org/10.4028/www.scientific.net/amr.160-162.906.

Pełny tekst źródła

Streszczenie:

Aggregate obtained by breaking wasted concrete is called recycled aggregate. Recycled aggregate concrete (RAC) is a kind of practical and economic material to reuse the great amount of construction and demolition wastes, which has received many discussions nowadays.Its fatigue behavior is different from other concretes as a result of different property of the aggregate of recycled concrete and other concrete. In order to apply RAC more effectively, it is necessary to study its properties especially for those aggregates from earthquake-stricken area for post-earthquake reconstruction. Therefore, on the basis of experimental research, the fatigue behaviors and microstructure of recycled concrete are studied in this paper. The present paper deals with investigations on fatigue behavior of the axial and eccentric compression performance of recycled aggregate reinforcement concrete specimens which are made from different recycled aggregate proportion such as 0%、50%、100%. Then micro-structural observations of the specimens by means of scanning electron microscopy (SEM) were obtained. Based on the analysis of experiment results, it can be proved that it is feasible to apply recycled concrete to practical engineering.

Style APA, Harvard, Vancouver, ISO itp.

14

Guo, Meng Meng, Zhong Ren Feng i Yang Chen. "Research on Material Fatigue Test of Steel Fiber Reinforced Concrete under Tension and Compression Loading". Key Engineering Materials 730 (luty 2017): 353–57. http://dx.doi.org/10.4028/www.scientific.net/kem.730.353.

Pełny tekst źródła

Streszczenie:

Using the material testing machine of electro-hydraulic servo fatigue tests had been carried out on ordinary concrete and steel fiber reinforced concrete. The fatigue life, strength, stress and strain had been measured under tension and compression loading. The variation of fatigue was analyzed based on the test results. Having regression analysis, obtained the fatigue strength. Mean-while, the fatigue strain-life curves of ordinary concrete and steel fiber reinforced concrete had been made after data processing. The results had been showed that the fatigue property of steel fiber reinforced concrete was significantly higher than that of ordinary concrete. And the fatigue strength increased about 32.6% compared with ordinary concrete. The tensile and compressive fatigue strain were slightly smaller than that of ordinary concrete.

Style APA, Harvard, Vancouver, ISO itp.

15

Lee. "Fatigue Evaluation of Precast Concrete Deck Connection using Ultra-High Performance, Fiber Reinforced Concrete". Journal of the Korean Society of Civil Engineers 35, nr 2 (2015): 275. http://dx.doi.org/10.12652/ksce.2015.35.2.0275.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

16

Yan, H. Q., i Qing Yuan Wang. "Post-Earthquake Experimental Research and Microscopic Analysis on Fatigue Behavior of Recycled Aggregate Reinforcement Concrete". Applied Mechanics and Materials 52-54 (marzec 2011): 1551–55. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.1551.

Pełny tekst źródła

Streszczenie:

In consistent with sustaining development, recycled aggregate concrete (RAC)that is made from recycled concrete aggregates could be a perfect solution to resource and environment preservation. It is a kind of practical and economic material to reuse the great amount of construction and demolition wastes, which has received many discussions nowadays. But, its fatigue behavior is different from other concretes as a result of different property of the aggregate of recycled concrete and other concrete. In order to apply RAC more effectively, it is necessary to study its properties especially for those aggregates from earthquake-stricken area for post-earthquake reconstruction. Therefore, on the basis of experimental research, the fatigue behaviors and microstructure of recycled concrete are studied in this paper. The present paper deals with investigations on fatigue behavior of the axial and eccentric compression performance of recycled aggregate reinforcement concrete specimens with contain recycled aggregate proportion of 0%、50%、100%. Then micro-structural observations of the specimens by means of scanning electron microscopy (SEM) were obtained. Based on the analysis of experiment results, it can be proved that it is feasible to apply recycled concrete to practical engineering.

Style APA, Harvard, Vancouver, ISO itp.

17

Wang, Yi Hong, i Qing Hua Han. "Fatigue Behavior of Elastic Concrete-Steel Composite Beams". Advanced Materials Research 671-674 (marzec 2013): 465–73. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.465.

Pełny tekst źródła

Streszczenie:

As a new material type, elastic concrete has been used in pavement and bridge deck paving due to its superior properties to ordinary concrete. Nowadays, fatigue behavior of steel-concrete composite beams has become the focus in engineering design. This paper summarized the research status, methods, influence factors on fatigue behavior of elastic concrete and steel-concrete composite beams and compared various fatigue specifications among different countries. The result shows that elastic concrete has longer fatigue life than ordinary concrete, so we can solve fatigue problems by using elastic concrete instead of ordinary concrete in composite beams. Finally the author puts forward suggestions for further advanced study in this area.

Style APA, Harvard, Vancouver, ISO itp.

18

Liu, Fangping, i Jianting Zhou. "Fatigue Strain and Damage Analysis of Concrete in Reinforced Concrete Beams under Constant Amplitude Fatigue Loading". Shock and Vibration 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/3950140.

Pełny tekst źródła

Streszczenie:

Concrete fatigue strain evolution plays a very important role in the evaluation of the material properties of concrete. To study fatigue strain and fatigue damage of concrete in reinforced concrete beams under constant amplitude bending fatigue loading, constant amplitude bending fatigue experiments with reinforced concrete beams with rectangular sections were first carried out in the laboratory. Then, by analyzing the shortcomings and limitations of existing fatigue strain evolution equations, the level-S nonlinear evolution model of fatigue strain was constructed, and the physical meaning of the parameters was discussed. Finally, the evolution of fatigue strain and fatigue damage of concrete in the compression zone of the experimental beam was analyzed based on the level-S nonlinear evolution model. The results show that, initially, fatigue strain grows rapidly. In the middle stages, fatigue strain is nearly a linear change. Because the experimental data for the third stage are relatively scarce, the evolution of the strain therefore degenerated into two phases. The model has strong adaptability and high accuracy and can reflect the evolution of fatigue strain. The fatigue damage evolution expression based on fatigue strain shows that fatigue strain and fatigue damage have similar variations, and, with the same load cycles, the greater the load level, the larger the damage, in line with the general rules of damage.

Style APA, Harvard, Vancouver, ISO itp.

19

Guo, Meng Meng, Zhong Ren Feng i Xiong Jiang Wang. "Effect of Pre-Crack on Fatigue Behaviors of Concrete under Tension and Compression Loading". Materials Science Forum 873 (wrzesień 2016): 110–14. http://dx.doi.org/10.4028/www.scientific.net/msf.873.110.

Pełny tekst źródła

Streszczenie:

With the material testing machine of electro-hydraulic servo, fatigue test have been carried out on coarse aggregate concrete with pre-crack .The fatigue life and fatigue strength of the concrete have been measured under tension and compression loading. The effect of pre-crack on concrete fatigue behavior has been analyzed based on the test results. Having regression treatment, obtained the concrete S-N curve and S-lgN curve of fatigue life. Mean-while, applying ANSYS finite element software, analysis and comparison of the fatigue behavior have been performed. The results show that pre-crack has a great influence on the fatigue behavior of concrete, and the fatigue life is reduced for 75%~80%.

Style APA, Harvard, Vancouver, ISO itp.

20

Zhou, Hong Yu, Yi Bo Chen, Jun Chang Ci i Cong Kun Yang. "Research Status of Fatigue Damage Mechanism of Reinforced Concrete Beam". Applied Mechanics and Materials 858 (listopad 2016): 44–49. http://dx.doi.org/10.4028/www.scientific.net/amm.858.44.

Pełny tekst źródła

Streszczenie:

Based on the fatigue damage mechanism, fatigue life, stiffness degradation, crack width change, bending, shear fatigue properties and other aspects, this paper introduces the research progress of the fatigue properties of ordinary reinforced concrete beams. And the existing reinforced concrete beam flexural, shear fatigue properties of research ideas, methods and results are summarized, providing the basis for further study on the fatigue performance of reinforced concrete beams. At present, the research results show that the fatigue damage of reinforced concrete beam is basically in accordance with the law of the three stages. In the early stage of fatigue, the tensile concrete cracks and exits, and the damage develops rapidly. In the middle of fatigue crack growth, fatigue damage is developed into a more moderate linear growth. In the late stage of fatigue, fatigue fracture occurs in the steel bar, and the bearing capacity of the beam is quickly lost.

Style APA, Harvard, Vancouver, ISO itp.

21

Saini, BabanpreetSingh, i S. P. Singh. "Flexural fatigue lifeassessment of self compacting concrete containing recycled concrete aggregates by using probabilistic approach". Proceedings of the 12th Structural Engineering Convention, SEC 2022: Themes 1-2 1, nr 1 (19.12.2022): 1347–54. http://dx.doi.org/10.38208/acp.v1.661.

Pełny tekst źródła

Streszczenie:

Present investigation has been conducted to analyze the fatigue life of self compacting concrete (SCC) containing different quantities of coarse fraction of Recycled Concrete Aggregates (RCA) by using probabilistic method. Three SCC mixes were prepared constituting 0%, 50% and 100% RCA. In total 165 beam specimens of size 100 × 100 × 500 (all dimensions in mm) were tested under fatigue loading in order to obtain fatigue life data at different stress levels. Static flexure test was also conducted on 126 beams prior to fatigue test. Fatigue life data have been modelled by using Weibull distribution method and subsequently distribution parameters were evaluated. Further, fatigue lives in terms of design fatigue life and theoretical fatigue life have been estimated by using the distribution parameters by employing probabilistic approach. It has been found that the design and theoretical fatigue life shows a significant reduction with the addition of RCA content. A decrease of 80-85 percent has been observed in the design and theoretical fatigue life when SCC has been made with RCA only. Substandard properties of RCA cause defects in the concrete by forming weak interfacial transition zone which degrades the fatigue performance of SCC containing RCA.

Style APA, Harvard, Vancouver, ISO itp.

22

Vébr, Ludvík, Bohuslav Novotný i Petr Pánek. "Experimental Investigation on Concrete Slab Fatigue Resistance". Advanced Materials Research 1054 (październik 2014): 54–57. http://dx.doi.org/10.4028/www.scientific.net/amr.1054.54.

Pełny tekst źródła

Streszczenie:

The paper summarizes results of pilot fatigue testing of concrete slabs resting on granular base in testing box. The project aimed at verification of recent findings that fatigue resistance of concrete slabs is much higher than that predicted by using concrete fatigue characteristics from beam testing. Paper presents additional testing results that confirm enhanced fatigue resistance of concrete slabs. Further research is envisioned to supplement pilot testing results and to receive new results also on fatigue resistance under concrete recycling scheme.

Style APA, Harvard, Vancouver, ISO itp.

23

Sainz-Aja, Jose, Carlos Thomas, Juan A. Polanco i Isidro Carrascal. "High-Frequency Fatigue Testing of Recycled Aggregate Concrete". Applied Sciences 10, nr 1 (18.12.2019): 10. http://dx.doi.org/10.3390/app10010010.

Pełny tekst źródła

Streszczenie:

Concrete fatigue behaviour has not been extensively studied, in part because of the difficulty and cost. Some concrete elements subjected to this type of load include the railway superstructure of sleepers or slab track, bridges for both road and rail traffic and the foundations of wind turbine towers or offshore structures. In order to address fatigue problems, a methodology was proposed that reduces the lengthy testing time and high cost by increasing the test frequency up to the resonance frequency of the set formed by the specimen and the test machine. After comparing this test method with conventional frequency tests, it was found that tests performed at a high frequency (90 ± 5 Hz) were more conservative than those performed at a moderate frequency (10 Hz); this effect was magnified in those concretes with recycled aggregates coming from crushed concrete (RC-S). In addition, it was found that the resonance frequency of the specimen–test machine set was a parameter capable of identifying whether the specimen was close to failure.

Style APA, Harvard, Vancouver, ISO itp.

24

Tang, Hong Wei, i Shi Bin Li. "Experimental Study on Fatigue Behavior of Low-Strength Concrete Beams". Applied Mechanics and Materials 94-96 (wrzesień 2011): 795–98. http://dx.doi.org/10.4028/www.scientific.net/amm.94-96.795.

Pełny tekst źródła

Streszczenie:

Reinforced concrete (RC) structures taking full advantages of concrete and reinforcing steel bars are widely applied in civil engineering. Concrete bridges are subjected to alternate loads as well as static loads, much importance should be attached to their fatigue. Reinforced concrete beams are the elementary members of concrete bridges. Fatigue failure mode and fatigue life prediction of normal or high-strength RC beams were the research focus at home. The fatigue behavior of low-strength RC beams was studied through four-point bending fatigue test in the paper. The test results indicated that all beams fractured for concrete shear failure, which made the fatigue life of low-strength concrete beams drop greatly compared to that of normal or high-strength concrete beams, because the fatigue failure of normal or high-strength concrete beams were caused by the fracture of one or more reinforcing steel bars; the mid-span deflection development of low-strength RC beams had three phases, and the middle phase occupied about 90% of whole fatigue life, also in the second phase the mid-span deflection developed linearly with the increasing of cycle numbers. This research work provides necessary basis for the fatigue life deterioration of low-strength RC beams.

Style APA, Harvard, Vancouver, ISO itp.

25

Long, Tao, Hongen Zhang, Yu Chen, Zhi Li, Jiageng Xu, Xiaoshuang Shi i Qingyuan Wang. "Effect of sulphate attack on the flexural fatigue behaviour of fly ash–based geopolymer concrete". Journal of Strain Analysis for Engineering Design 53, nr 8 (12.07.2018): 711–18. http://dx.doi.org/10.1177/0309324718783607.

Pełny tekst źródła

Streszczenie:

In this work, the erosion effect of sulphate solution on the flexural fatigue behaviour of fly ash–based geopolymer concrete was investigated. Under cyclic bending loading, the effect of sulphate attack on the fatigue life of geopolymer concrete was analysed using the static flexural strength as the damage index. Results revealed that the fatigue life of geopolymer concrete after sulphate erosion was significantly reduced compared with uncorroded samples under the same fatigue loading condition. And the fatigue life of corroded/uncorroded geopolymer concrete can be approximately described by the two-parameter Weibull distribution model. Since the sulphate attack would increase the actual stress level of corroded geopolymer concrete, a fatigue equation considering the damage index was deduced to predict the fatigue life of geopolymer concrete after sulphate attack.

Style APA, Harvard, Vancouver, ISO itp.

26

Sohel, K. M. A., M. H. S. Al-Hinai, A. Alnuaimi, M. Al-Shahri i S. El-Gamal. "Prediction of flexural fatigue life and failure probability of normal weight concrete". Materiales de Construcción 72, nr 347 (28.06.2022): e291. http://dx.doi.org/10.3989/mc.2022.03521.

Pełny tekst źródła

Streszczenie:

Fatigue life has to be considered in the design of many concrete structures at various stress levels and stress ratios. Many flexural fatigue test results of plain normal-weight concrete are available in the literature and almost every set of test results provides different fatigue equations. It is necessary, though, to have a common fatigue equation to predict the design fatigue life of concrete structures under flexural load with reasonable accuracy. Therefore, a database of flexural fatigue test results was created for concrete with strengths ranging from 25 to 65 MPa; this database was used to derive new fatigue equations (Wöhler fatigue equation and S-N power relationship) for predicting the flexural fatigue life of normal-weight concrete. The concept of equivalent fatigue life was introduced to obtain a fatigue equation using the same stress ratio. A probabilistic analysis was also carried out to develop flexural fatigue equations that incorporate failure probabilities.

Style APA, Harvard, Vancouver, ISO itp.

27

Fitzka, Michael, Ulrike Karr, Maximilian Granzner, Tomáš Melichar, Martin Rödhammer, Alfred Strauss i Herwig Mayer. "Ultrasonic fatigue testing of concrete". Ultrasonics 116 (wrzesień 2021): 106521. http://dx.doi.org/10.1016/j.ultras.2021.106521.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

28

Pryl, Dobromil, Jitka Mikolášková i Radomír Pukl. "Modeling Fatigue Damage of Concrete". Key Engineering Materials 577-578 (wrzesień 2013): 385–88. http://dx.doi.org/10.4028/www.scientific.net/kem.577-578.385.

Pełny tekst źródła

Streszczenie:

Numerical model for fatigue crack propagation within the framework of finite element smeared crack analysis is presented. It concentrates on modeling of fatigue behavior of material under tensile load which causes initiation and growth of cracks in concrete. The fatigue material model is an extension of existing static three-dimensional fracture-plastic material model, and as such it has been implemented into the ATENA Finite Element software package. The developed model has been used to model experiments with high-cycle loading of three point bending concrete specimens tested by collaborating institutions. Analysis results are compared to the measurements.

Style APA, Harvard, Vancouver, ISO itp.

29

Shahawi, Mohsen El, i Barrington deV Batchelor. "Fatigue of Partially Prestressed Concrete". Journal of Structural Engineering 112, nr 3 (marzec 1986): 524–37. http://dx.doi.org/10.1061/(asce)0733-9445(1986)112:3(524).

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

30

Wedding, PA, D.-Y. Lee, JJF Yang i FW Klaiber. "Fatigue Behavior of Superplasticized Concrete". Cement, Concrete and Aggregates 7, nr 1 (1985): 19. http://dx.doi.org/10.1520/cca10039j.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

31

Alliche, A., i D. Frangois. "Damage of Concrete in Fatigue". Journal of Engineering Mechanics 118, nr 11 (listopad 1992): 2176–90. http://dx.doi.org/10.1061/(asce)0733-9399(1992)118:11(2176).

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

32

Kessler-Kramer, Christoph, i Harald S. Müller. "Fatigue Design of Concrete Structures". IABSE Symposium Report 87, nr 9 (1.01.2003): 121–27. http://dx.doi.org/10.2749/222137803796329376.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

33

Wang, Yi, i Henry J. Petroski. "Fatigue crack propagation in concrete". International Journal of Fracture 41, nr 3 (listopad 1989): R55—R58. http://dx.doi.org/10.1007/bf00018663.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

34

Claßen, Martin, i Joerg Gallwoszus. "Concrete fatigue in composite dowels". Structural Concrete 17, nr 1 (25.01.2016): 63–73. http://dx.doi.org/10.1002/suco.201400120.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

35

Li, Qing Song, i Shao Ping Meng. "The Finite Element Analysis of Fatigue Performance of Precracked Concrete Beams Strengthened with Prestressed CFRP". Advanced Materials Research 250-253 (maj 2011): 3320–27. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.3320.

Pełny tekst źródła

Streszczenie:

The research conducts the numerical analysis of the fatigue performance of precracked concrete beams strengthened with prestressed CFRP, establishing the static analysis model (SM) and fatigue analysis model (FM) respectively, examining the change of the static loading and fatigue performance before and after CFRP strengthens precracked concrete beams in the different prestressed situations, and analyzing the relevant fatigue performance parameters through comparing FEM analysis with experimental results. The research results demonstrate that the method of strengthening concrete beams with prestressed CFRP can improve the static loading and fatigue performance; the increased rate of fatigue performance of precracked concrete beams is parallel to the CFRP prestress; the fatigue life of precracked concrete beams increases with the raising of the CFRP prestress; FEM analysis is in close agreement with experiment results; the fatigue properties of precracked concrete beams strengthened with prestressed CFRP can be analyzed effectively by the finite element method.

Style APA, Harvard, Vancouver, ISO itp.

36

Liu, Ke, Yan Ming Wang, Wen Wen Yang i Yong Sun. "Study on Fatigue Resistance Performance of Flexible Fiber and Rigid Fiber Reinforced Concrete". Advanced Materials Research 430-432 (styczeń 2012): 619–22. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.619.

Pełny tekst źródła

Streszczenie:

The fiber reinforced concrete with flexible fiber and rigid fiber respectively added into C30 plain concrete, curing under standard condition for 28 days, was used for fatigue resistance performance experiment. The flexible fiber is American Dura fiber and Chinese nylon fiber. The rigid fiber is Chinese steel fiber. The fatigue resistance property was evaluated by the residual strength after 400 thousand times fatigue damage. The result shows that the residual strength of C30 plain concrete was only 35.0% of initial value, but the residual strength of C30 fiber reinforced concrete still remained 75%~90% of initial value. The residual strength of steel fiber concrete, Dura fiber concrete, nylon fiber concrete, is respectively 2.5, 2.3 and 2.1 times of the plain concrete. The fiber reinforced concrete improves the fatigue resistance property compared with the plain concrete. The fatigue resistance ability of flexible fiber and rigid fiber reinforced concrete is close to each other.

Style APA, Harvard, Vancouver, ISO itp.

37

Zheng, Yuanxun, Lei Yang, Pan Guo i Peibing Yang. "Fatigue Characteristics of Prestressed Concrete Beam under Freezing and Thawing Cycles". Advances in Civil Engineering 2020 (4.09.2020): 1–11. http://dx.doi.org/10.1155/2020/8821132.

Pełny tekst źródła

Streszczenie:

In order to reveal the influence of freezing and thawing on fatigue properties of the prestressed concrete beam, a kind of novel freeze-thaw test method for large concrete structure components was proposed, and the freeze-thaw experiments and fatigue failure test of prestressed concrete hollow beams were performed in this paper. Firstly, the compressive strength and dynamic elastic modulus of standard specimens subjected to different numbers of freeze-thaw cycles (0, 50, 75, and 100) were determined. Then, the static and dynamic experiments were performed for prestressed concrete beams under different freeze-thaw cycles. Depending on the static failure test results, the fatigue load for the prestressed concrete beam model was carried out, the fatigue tests for prestressed concrete beam under freezing and thawing cycles were done, and the influence of fatigue loading times on dynamic and static characteristics of prestressed concrete beam was also studied. Finally, the relation between fatigue characteristics and numbers of freeze-thaw cycles was established, and the fatigue life prediction formulas of prestressed concrete beams under freeze-thaw cycles were developed. The research shows that the freezing and thawing cycles had obvious influence on fatigue life, and the freezing and thawing cycles should be taken into account for life prediction and quality evaluation of prestressed concrete beams.

Style APA, Harvard, Vancouver, ISO itp.

38

Miao, Yuan-Yao, Di-Tao Niu i Ning Cheng. "Durability of Concrete Under the Combined Action of Carbonization and Fatigue Loading of Vehicles". Science of Advanced Materials 11, nr 12 (1.12.2019): 1781–87. http://dx.doi.org/10.1166/sam.2019.3706.

Pełny tekst źródła

Streszczenie:

Natural factors such as environments gradually cause the aging of structural materials of concrete bridges and mechanical properties of the components are constantly degraded. When highway bridge structures are under the combined with vehicle loading and environmental diversities, the degradation of structural performance is further aggravated. In this study, according to the deterioration trend of concrete durability in atmospheric environment, durability tests for concrete under the combined action of fatigue loading of vehicles and carbonization were performed by artificial climate simulation. A bending fatigue test for concrete under vehicle loading was carried out, and the trend of fatigue life change with vehicle loading level and the trend of fatigue strain development were obtained. The results show that the fatigue life increases with the decrease in fatigue loading level of vehicles, and the logarithmic value of fatigue life Nf is linear with the fatigue stress level S. Fast carbonization tests for concrete were performed with respect to the fatigue damage degree D of 0, 0.2, 0.4, 0.6, and 0.8. It was found that the carbonization trend of fatigue damaged concrete under vehicle loading follows the Fick first law. The carbonization depth increases with the increase in carbonization time, relatively fast at the initial stage and then slowly at the later stage. When the fatigue damage degree D is less than 0.4, the effects of fatigue damage on carbonization is relatively small. When D is more than 0.4, the effect of fatigue damage on carbonization is relatively significant. The extension of interior micro-cracks and micropores caused by fatigue damage is a significant factor affecting the carbonization performance of fatigue damaged concrete. The change trend of carbonization depth of damaged concrete with time was fitted and analyzed. An influencing factor of fatigue damage was introduced, and a durability prediction model for concrete under the combined action of carbonization and fatigue loading of vehicles was established.

Style APA, Harvard, Vancouver, ISO itp.

39

Hai, Hong, Li Sun i Ying Hua Zhao. "Fatigue Investigation of High-Strength Concrete Members Reinforced with CFRP". Advanced Materials Research 250-253 (maj 2011): 2202–5. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.2202.

Pełny tekst źródła

Streszczenie:

Fatigue damage becomes an emerging problem in lots of concrete structures which will subject to cyclic loadings during their working life. This paper presents a study on interfacial shear fatigue performance of a high-strength concrete structure strengthened by carbon fiber-reinforced plastic (CFRP) plate, which has been established as an effective method for rehabilitation and strengthening of concrete structures. Based on the static test, a new experimental investigation of the shear fatigue performance along the concrete-plate interface under the low cycle fatigue load in the condition of R=0.1 is presented. The main variable is the concrete strength. Compared with the static ultimate strength, fatigue strength decreases. Therefore, a safety factor of the fatigue strength at the interface of CFRP and concrete should be applied in design.

Style APA, Harvard, Vancouver, ISO itp.

40

Liu, Fangping, i Jianting Zhou. "Research on Fatigue Strain and Fatigue Modulus of Concrete". Advances in Civil Engineering 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/6272906.

Pełny tekst źródła

Streszczenie:

Concrete fatigue strain and fatigue modulus evolution play a vital role in the evaluation of the material properties. In this paper, by analyzing the advantages and disadvantages of existing concrete strain analysis methods, the level-S nonlinear fatigue strain model was proposed. The parameters’ physical meaning, the ranges, and the impact on the shape of the curve were all discussed. Then, the evolution model of fatigue modulus was established based on the fatigue strain evolution model and the hypothesis of fatigue modulus inversely related fatigue strain amplitude. The results indicate that the level-S model covered all types of fatigue strain evolution. It is very suitable for the description of strain evolution of concrete for its strong adaptability and high accuracy. It was found that the fitting curves coincided with the experimental curves very well, and the correlation coefficients were all above 0.98. The evolution curves of fatigue strain modulus both have three stages, namely, variation phase, linear change stage, and convergence stage. The difference is that the fatigue strain evolution curve is from the lower left corner to the upper right corner, but the fatigue modulus evolution curve is from the upper left corner to the right lower corner.

Style APA, Harvard, Vancouver, ISO itp.

41

Wang, Zhenhui, Rongxin Guo, Guoshou Liu, Luxin Guo i Yong Yan. "Study on Flexural Fatigue Properties of POM Fiber Airport Pavement Concrete". Polymers 14, nr 15 (22.07.2022): 2979. http://dx.doi.org/10.3390/polym14152979.

Pełny tekst źródła

Streszczenie:

Polyoxymethylene (POM) fiber is a new polymer fiber with the potential to improve the performance of airport pavement concrete. The effect of POM fiber on the flexural fatigue properties of concrete is an important issue in its application for airport pavement concrete. In this study, four-point flexural fatigue experiments were conducted using ordinary performance concrete (OPC) and POM fiber airport pavement concrete (PFAPC) with fiber volume contents of 0.6% and 1.2%, at four stress levels, to examine the flexural fatigue characteristics of these materials. A two-parameter Weibull distribution test of flexural fatigue life was performed, after examining the change in flexural fatigue deformation using the cycle ratio (n/N). A flexural fatigue life equation was then constructed considering various failure probabilities (survival rate). The results show that POM fiber had no discernible impact on the static load strength of airport pavement concrete, and the difference between PFAPC and OPC in terms of static load strength was less than 5%. POM fiber can substantially increase the flexural fatigue deformation capacity of airport pavement concrete by almost 100%, but POM fiber had a different degree of detrimental impact on the fatigue life of airport pavement concrete compared to OPC, with a maximum decrease of 85%. The fatigue lives of OPC and PFAPC adhered to the two-parameter Weibull distribution, the single- and double-log fatigue equations considering various failure probabilities had a high fitting degree based on the two-parameter Weibull distribution, and their R2 was essentially over 0.90. The ultimate fatigue strength of PFAPC was roughly 4% lower than that of OPC. This study on the flexural fatigue properties of POM fiber airport pavement concrete has apparent research value for the extension of POM fiber to the construction of long-life airport pavements.

Style APA, Harvard, Vancouver, ISO itp.

42

Liang, Jun Song, i Jie Li. "Damage Theory Based Fatigue Simulation of Concrete Structure". Applied Mechanics and Materials 784 (sierpień 2015): 51–58. http://dx.doi.org/10.4028/www.scientific.net/amm.784.51.

Pełny tekst źródła

Streszczenie:

The fatigue problem of concrete has long been studied through many different methods. However, the fatigue process and failure patterns of concrete structures have never been well simulated due to the lack of comprehensive understanding of the material properties under fatigue loads. In order to carry out an accurate simulation of the fatigue behavior of concrete structures, this paper proposes a new damage theory based fatigue constitutive model for concrete. The present model adopts two damage variables to describe the degradation of macro mechanical properties of concrete under tension and compression, respectively. And the tensile and compressive damage evolutions are related to the corresponding effective stress spaces. Specifically, by implementing the present model into the nonlinear finite element package, the bending fatigue process of a concrete beam is simulated. Meanwhile a set of numerical tests are presented, through which the validity and effectiveness of the proposed model for the simulation of concrete structures are illustrated.

Style APA, Harvard, Vancouver, ISO itp.

43

Zhaodong, Ding, i Li Jie. "A physically motivated model for fatigue damage of concrete". International Journal of Damage Mechanics 27, nr 8 (13.08.2017): 1192–212. http://dx.doi.org/10.1177/1056789517726359.

Pełny tekst źródła

Streszczenie:

The fatigue problem of concrete is still a challenging topic in the researches and applications of concrete engineering. This paper aims to develop a fatigue damage evolution law based model for concrete motivated by the analysis of physical mechanism. In this model, the fatigue energy dissipation process at microscale is investigated with rate process theory. The concept of self-similarity is employed to bridge the scale gap between microscale cracking and mesoscale dissipative element. With the stochastic fracture model, the crack avalanches and macro-crack nucleation processes from mesoscale to macroscale are simulated to obtain the behaviors of macroscope damage evolution of concrete. In conjunction with continuum damage mechanics framework, the fatigue damage constitutive model for concrete is then proposed. Numerical simulations are carried out to verify the model, revealing that the proposed model accommodates well with physical mechanism of fatigue damage evolution of concrete whereby the fatigue life of concrete structures under different stress ranges can be predicted.

Style APA, Harvard, Vancouver, ISO itp.

44

Liao, Nengwu, Longxian Huang, Hong Li, Xianxi Hu, Bin Guo i Liangliang Zhang. "Fatigue test study of weathering steel-concrete composite beam under corrosive environment". Vibroengineering PROCEDIA 49 (18.05.2023): 93–97. http://dx.doi.org/10.21595/vp.2023.23266.

Pełny tekst źródła

Streszczenie:

In this paper, two sets of comparative fatigue tests on weathering steel-concrete composite girders were carried out in the context of steel-concrete composite girder bridges. The load-deflection relationship of the weathering steel-concrete composite girders under fatigue loading in different environments was investigated contrastively. The experimental results show that under the coupled effect of corrosive environment and fatigue load, the weathering steel still shows obvious corrosion; the simple fatigue load has no significant effect on the stiffness and fatigue modulus of the weathering steel-concrete composite beam, while the coupled effect of corrosive environment and fatigue has a significant weakening effect on the stiffness of the beam, and the weakening of concrete is apparently greater than that of steel beam.

Style APA, Harvard, Vancouver, ISO itp.

45

Shah, Santosh G., Sonalisa Ray i J. M. Chandra Kishen. "Fatigue crack propagation at concrete–concrete bi-material interfaces". International Journal of Fatigue 63 (czerwiec 2014): 118–26. http://dx.doi.org/10.1016/j.ijfatigue.2014.01.015.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

46

Cheng, Yong Chun, Hui Li Ma, Qing Lin Guo, Chun Xu i Peng Zhang. "Experimental Investigation on Fatigue Property of Asphalt Concrete Modified by Diatomite-Glass Fibers". Applied Mechanics and Materials 236-237 (listopad 2012): 38–42. http://dx.doi.org/10.4028/www.scientific.net/amm.236-237.38.

Pełny tekst źródła

Streszczenie:

Diatomite and glass fiber are used for modifying asphalt concrete in this paper. Besides, wet and dry processes are adopted to achieve the composite modified asphalt concrete. Meanwhile, experimental investigation has been done on its fatigue properties and dynamic mechanical property, it indicates that diatomite-glass fiber modified asphalt concrete has a better capacity to resist fatigue damage. Compared with matrix asphalt concrete, the modified asphalt concrete has higher fatigue life. Thus, its mechanical parameter of fatigue property changes obviously so as to provide a reference basis for the durability design of pavement materials.

Style APA, Harvard, Vancouver, ISO itp.

47

Chernov, Sergey A., K. D. Golyubin i Lyudmila V. Eremeeva. "Modifying Additives Effect on Use Properties of Asphalt Concrete". Materials Science Forum 931 (wrzesień 2018): 653–60. http://dx.doi.org/10.4028/www.scientific.net/msf.931.653.

Pełny tekst źródła

Streszczenie:

The article dwells on the results of the survey of the asphalt concrete modified with various additives. It contains the results of the impact made by the modifying additives on the physical mechanic and performance properties (rutting resistance, fatigue life and permanent deformation accumulation resistance) of the Type A Grade I asphalt concretes. In the article the regularities of the influence exerted by the formula-related and technological factors on the asphalt concrete properties were established. Consistent with the obtained results forecasting of rutting in accordance with AVTODOR STO 2.28-2016 and forecasting of fatigue damage accumulation on the basis of the Miner’s cumulative model of damage linear addition were executed. On the basis of the forecast results the interrepair life of the road structures with the pavement courses of asphalt concretes containing the surveyed modifiers was evaluated.

Style APA, Harvard, Vancouver, ISO itp.

48

Xie, Jianhe, Jianglin Li, Zhongyu Lu i Huan Zhang. "Experimental Study on Fatigue Behaviour of BFRP-Concrete Bond Interfaces under Bending Load". Shock and Vibration 2018 (2018): 1–11. http://dx.doi.org/10.1155/2018/7497061.

Pełny tekst źródła

Streszczenie:

Basalt fiber reinforced polymer (BFRP) composites are increasingly being used to retrofit concrete structures by external bonding. For such strengthened members, the BFRP-concrete interface plays the crucial role of transferring stresses. This study aims to investigate the fatigue behaviour of the interface under bending load. A series of tests were conducted on BFRP-concrete bonded joint, including static, fatigue, and postfatigue loading. The fatigue failure modes, the development of deflection, the evolution of BFRP strains, and the propagation of interfacial cracks were analysed. In addition, the debonding-induced fatigue life of BFRP-concrete bonded joints was studied. Finally, a new model of fatigue life was proposed by defining the effective fatigue bond stress. The results showed that the fatigue experience has a significant effect on the BFRP strength especially near the root of concrete transverse crack and on the bond performance of the adhesive near the interface crack tip. There are two main fatigue failure modes: BFRP rupture and BFRP debonding. The fatigue damage development of the bond interface has three stages: rapid, stable, and unstable growth. The proposed model for the debonding-induced fatigue life is more conservative for the BFRP-concrete bonded joints under pure shear load than for those under bending load.

Style APA, Harvard, Vancouver, ISO itp.

49

Al-Zaid, Rajeh Z., i Andrzej S. Nowak. "Fatigue strength of prestressed concrete girder bridges". Canadian Journal of Civil Engineering 15, nr 2 (1.04.1988): 199–205. http://dx.doi.org/10.1139/l88-027.

Pełny tekst źródła

Streszczenie:

A model for evaluating the fatigue life of a prestressed concrete girder bridge is presented. Experimental studies indicate that fatigue is a random phenomenon. Therefore, the approach is based on probabilistic methods. The fatigue life of the prestressed concrete girder is estimated from the fatigue properties of its components, namely, the cast-in-place slab, precast beam, prestressing steel, and, if partially prestressed, the tension reinforcement. The model utilizes the available S–N curves for structural materials and Miner's rule to evaluate the fatigue life under variable amplitude loading. A model for determining the distribution function of time to first cracking is also presented. To demonstrate the developed models, a typical prestressed concrete girder bridge is analyzed. On the basis of this investigation, it is concluded that fatigue in prestressed concrete girder bridges designed according to the American Association of State Highway and Transportation Officials specifications is not a limiting design criterion. Key words: bridges, fatigue, prestressed concrete, structural reliability.

Style APA, Harvard, Vancouver, ISO itp.

50

Afaghi, Mohammad, Anja B. E. Klausen i Jan Arve Øverli. "A Review on Fatigue Performance of Concrete Structures Part II, Material Parameters and Environmental Factors". Nordic Concrete Research 68, nr 1 (1.07.2023): 127–44. http://dx.doi.org/10.2478/ncr-2023-0005.

Pełny tekst źródła

Streszczenie:

Abstract Fatigue is a critical issue for concrete structures subjected to repetitive and varying loads, particularly in infrastructure and transportation systems. This review paper presents a comprehensive overview of the current state of knowledge on concrete fatigue and identifies areas for further research. Material and size factors that influence fatigue performance and life estimation of concrete such as concrete composition, internal moisture content and reinforcement are explored, along with environmental conditions such as presence of external moisture and seawater exposure. The paper also acknowledges the challenges associated with predicting concrete fatigue life accurately due to the heterogeneous nature of concrete and its complex behavior under cyclic loading.

Style APA, Harvard, Vancouver, ISO itp.

Artykuły w czasopismach na temat „Concrete Fatigue”

Utwórz poprawne odniesienie w stylach APA, MLA, Chicago, Harvard i wielu innych