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# Analytical Models of Concrete Fatigue: A State-of-the-Art Review

1
College of Civil Engineering, Tongji University, Shanghai, 200092, China

2
Department of Civil Engineering, Minia University, EL-Minia, 61111, Egypt

* Corresponding Author: Xiaodan Ren. Email:

*Computer Modeling in Engineering & Sciences* **2023**, *134*(1), 9-34. https://doi.org/10.32604/cmes.2022.020160

**Received** 08 November 2021; **Accepted** 22 February 2022; **Issue published** 24 August 2022

## Abstract

Fatigue failure phenomena of the concrete structures under long-term low amplitude loading have attracted more attention. Some structures, such as wind power towers, offshore platforms, and high-speed railways, may resist millions of cycles loading during their intended lives. Over the past century, analytical methods for concrete fatigue are emerging. It is concluded that models for the concrete fatigue calculation can fall into four categories: the empirical model relying on fatigue tests, fatigue crack growth model in fracture mechanics, fatigue damage evolution model based on damage mechanics and advanced machine learning model. In this paper, a detailed review of fatigue computing methodology for concrete is presented, and the characteristics of different types of fatigue models have been stated and discussed.## Keywords

It is inevitable for concrete structures to bear fatigue loads during their lifetime. With the development of material science and technology, the fatigue stress level acting on concrete gradually increases. Due to the high amplitude and frequency of fatigue loads, the fatigue problem is prominent, particularly on new concrete structures such as wind power towers, offshore platforms, and high-speed railways. For example, Fig. 1 shows that the reinforced concrete foundation of a wind turbine tower cracked due to long-term fatigue loads. In order to ensure safety, the research on fatigue of concrete is of vital importance in structural engineering. Over the past century, significant and considerable efforts have been made to develop analytical and numerical methods for concrete fatigue. Tests show that a number of loading cycles will lead to structural failure due to energy dissipation with each loading cycle, and there are hysteresis loops in the stress-strain curve, as shown in Fig. 2. The fatigue life

This research is organized as follows. Some experimental fatigue models, including S − N curves and empirical failure criteria, are presented in Section 2. The solid mechanics models for studying concrete fatigue, which can be divided into fracture mechanics and damage mechanics are discussed in Sections 3 and 4, respectively. The application of machine learning to concrete fatigue research is briefly introduced in Section 5. Finally, Section 6 summarizes some conclusions. In the following sections, the characteristics of every fatigue analysis model for concrete will be illustrated and discussed in detail.

2 Empirical Models Based on Experiments

In general, experimental research has been used to investigate any engineering phenomena. Since the importance of structural fatigue has been recognized, fatigue tests have been carried out, and some empirical models to reflect the fatigue laws of concrete have been established. In 1870, after a systematic study on the fatigue failure of a train wheel, Wöhler[2] proposed Wohler’s law, which reflects the relationship between the stress level S and the number of load cycles N, which is known as the S − N curve. Accordingly, many fatigue tests of concrete were carried out by researchers, and the S − N curves of concrete were fit based on the test data. The earliest concrete compression fatigue test can be traced to the early 20th century[3,4]. Since the 1970s, experimental research on the fatigue performance of concrete under uniaxial compression has been systematically explored. In 1973, a formula of compression S − N curves for concrete was proposed by Aas-Jakobsen etal. [5] and modified by Tepfers etal. [6] as a linear relationship in the semilogarithmic coordinate system, and it was expressed as follows:

where fatigue strength S is the ratio of the maximum stress

On this basis, the effect of loading rate on the fatigue life of concrete was noted and studied[9–11]. It was indicated that with the increase of loading rate, the fatigue life of concrete at a certain stress level would increase. In order to consider the rate effect on fatigue performance, the loading period T was introduced into the expression of Eq. (1) by Hsu etal.[10], and the different expressions of high-cycle fatigue and low-cycle fatigue were expressed as follows:

• High cycle fatigue (

• Low cycle fatigue (1 cycle

The parameters in Eqs. (2) and (3) have been taken as the exact meanings of the original formula in Eq. (1).

In addition, the research on the compression fatigue performance of high-strength concrete indicated that the fatigue strength would decrease with the increase of the static strength[1,12–14]. Based on test results, a formula for S − N relationship considering concrete strength was proposed by Kim[1]:

where

Owing to the significant difference between the tensile and compressive characteristics of concrete, the experiments of tensile fatigue were performed through the indirect splitting test[15] and the direct tensile test[16–18]. It is more complex to carry out the tension fatigue tests of concrete than compression fatigue tests because the eccentricity of loading in pulse tension test is easy to occur, which is difficult to deal with even for static loading. Moreover, special test equipment and specimen shape are required in the tension test. Thus, the results of tensile fatigue tests are relatively small. In 1979, the same formula of the tension S − N curves as Eq. (1) was obtained by Tepfers[15] through splitting tensile test, in which the parameter

• Tension fatigue (

• Compression-tension fatigue (

where ft and fc are the static tensile strength and the static compressive strength of concrete, respectively.

In practice, materials are probably subjected to a multi-dimensional stress. The current test research of the multi-dimensional fatigue loading is relatively scarce. In this regard,the biaxial fatigue tests have been performed and presented[19,20], besides the axial fatigue testes with lateral confinement [21–26]. It could be observed that the compressive fatigue strength of concrete would increase while the tensile fatigue strength would decrease under lateral confinement. In addition, the expression of the S − N curves with lateral confinement was given by Hooi[21] as follows:

in which

In order to consider the great discreteness and randomness of concrete fatigue life, the fatigue strength under a certain failure probability P was studied in the statistical probability method [27]. The empirical S − N − P relationships between stress level (S), number of cycles (N), and failure probability (P) were fitted[28–30]. In addition, fatigue tests of new materials, such as high-strength concrete[1,31], fiber-reinforced concrete[32], recycled aggregate concrete[33], and so on, also were carried out. It is worth noting that the main objective of the early research on concrete fatigue was to obtain the quantitative relationship between fatigue life and fatigue stress by several tests. Indeed, it’s convenient to calculate the fatigue life under a given stress level with S − N curves. Due to the large discreteness of concrete fatigue experiments, a large number of experiments are needed to obtain the S − N curves. However, most of the conclusions obtained are inadequate to cover all the different cases, particularly in the complex stress field; no unified conclusion is universally accepted.

2.2 Empirical Fatigue Failure Criteria

In order to give an index to judge fatigue failure, some phenomenal fatigue damage accumulation models are developed. It is assumed that damage is accumulated linearly with the number of the load cycles, and the fatigue damage D is defined as the sum of the ratio of the load cycles Ni to the fatigue life

in which C represents the C-th fatigue stress level, and Ni and

Although the improved P − M rules consider the nonlinearity of damage accumulation associated with the loading history, it is still limited to concrete material and difficult to extend to fatigue prediction of the whole structure. The premise of using the P − M rule is that the ultimate fatigue life

It can be concluded that the fatigue research presented in this section is focused on the fatigue performance of concrete material level. Also, several types of research have been carried out on the fatigue of the concrete beams [47–55] and slabs[56,57]. Structural fatigue is affected by many factors, such as reinforcement ratio, shear span ratio, concrete strength, and so on. Only some qualitative conclusions were drawn, and there are no united and universal design standards for fatigue of concrete structures. The limit state method or the allowable stress method are still used for the design of concrete structures subjected to fatigue loads, which means that stress redistribution during loading cannot be considered.

3 Fracture Mechanics-Based Fatigue Models

This section introduces the application of fracture mechanics methods in concrete fatigue. Due to the fact that the concrete is a complex composite material, the micro-cracks are initiated and propagated during the curing process. Consequently, the expansion and accumulation of these micro-cracks under fatigue loading lead to the generation of macro-cracks, which causes fatigue fracture of concrete. Thus, the theories of fracture mechanics describing crack propagation were initially introduced to investigate the growth of the fatigue crack. The more commonly used methods include Paris’ law and the cohesive crack model.

3.1 The Modified Paris’ Law for Concrete

Paris’ law based on linear elastic fracture mechanics gives the fatigue growth rate at the crack tip. In 1962, a formula describing the propagation rate of fatigue crack was proposed by Paris etal.[58], known as Paris’ law, and it was expressed as follows:

where a represents the crack length, N is the number of cyclic loads,

in which

where

It is found that the growth of fatigue cracks could also be affected by the concrete specimens sizes [49,69,70]. The size effect on the crack growth was studied in [69,70], and a size-adjusted Paris’ law was proposed as follows:

where KIc is the size-adjusted fracture toughness, KIf is the asymptotic value of fracture toughness for an infinitely large specimen, d is the depth of the specimen, and d0 is a constant characterizing the specimen geometry. Compared to Eq. (9), a normalized stress intensity factor was adopted in the size-adjusted Paris’ law, and the normalization rule is related to the size of the specimen. Then,the discoveries of Kolluru etal. [71–73] were that the crack growth rate decreased first and then increased. The critical crack length where the rate of crack growth changed from deceleration to acceleration was the crack length at the peak load of the quasi-static response. Two mechanisms governing the crack growth rate were assumed: the crack growth is governed by the increasing resistance in the deceleration stage, and the Mode I stress intensity factor

• In the deceleration stage (a <acrit)

• In the acceleration stage (a ≥ acrit)

where acrit is the critical length at the peak load of the quasi-static response,

Since concrete is a composite complex material, the path and shape of concrete crack surface are random when concrete material cracks. Therefore, some fractal theories and self-similarity methods were introduced to explain the propagation of the fatigue crack and improve the Paris’ law [74–76]. However, it was only an approximation means, and there was minor progress in promoting the modified Paris’ law to apply to the concrete fatigue crack.

It should be noted that Paris’ law is concerned with the existing small cracks, in which the crack initiation cannot be considered. Because the stress intensity factor is only applicable to the near-tip zone of the crack, the use of the linear elastic fracture mechanics requires that the crack zone be very small compared with the dimensions of the specimen. With the crack propagation, the stress intensity factor is no longer dominant.

3.2 The Cohesive Fatigue Crack Models

It is generally believed that the nonlinearity of concrete crack tip should be considered. In the 1970s, the fictitious crack model was proposed first by Hillerborg etal. [77] to reflect the nonlinear characteristics of materials in the fracture process. The fictitious crack model, which is also usually called the cohesive crack model, contributes to using the finite element method in complex fracture problems. A certain number of assumptions had been made to apply the cohesive crack model to fracture analysis of concrete material [78,79]. Firstly, it is assumed that a fracture zone can transfer traction at the crack tip. Secondly, it is assumed that before the ultimate strength of the material is reached, the concrete is elastic, and if the principal tensile stress exceeds the ultimate strength, the concrete materials start to crack, and the tensile stress also starts to decrease. The stress transfer ability depends on the crack opening displacement

Initially, the cohesive crack model was mainly used for the cracking process under monotonic loading. The cohesive crack model was first used to explain qualitatively how fatigue crack extends and how the stress at the tip changes by Reinhardt [80], illustrated as Fig. 6. Assume a crack with length a(N) after N loading cycles, and the softening zone c(N) has developed in front of the crack, as shown in Fig. 6a. After the external force is completely released, the part with too large strain cannot be completely recovered. The stress at the crack tip will not disappear but remains self-equilibrium, as shown in Fig. 6b. During the next loading cycle, the stress in the softening zone reduces due to the influence of unloading, and the softening zone should spread a little in order to ensure equilibrium, as shown in Fig. 6c. In a following cycle, the same procedure is repeated, and the softening zone will extend forward, as shown in Figs. 6d and 6e. Along this simple physical model, the stress-COD envelopes and the hysteresis relationships were needed for the numerical simulations. For example, a trilinear stress-strain envelope and the straight-line unloading-reloading paths in each stage, as shown in Fig. 7, were assumed by Gylltoft [81] to simulate the progressive fracture of the notched beams of plain concrete subjected to cyclic loading. However, this is inadequate to describe more failure modes.

In order to obtain better stress-COD curves, monotonic loading and cyclic loading tests were carried out [82,83]. The widely used expression of the

where c1 and c2 are constants. In addition, a detailed focal point model describing the path of unloading and reloading was proposed by Yankelevsky and Reinhardt [83] based on the observations of stiffness changes in a specific cycle, as shown in Fig. 8. In this model, multiple lines were used to specify the relationship between stress and crack opening displacement at the crack tip during the process of loading-unloading-reloading. The focal model presents a cyclic approach which is closer to the actual behavior. Since the construction of the focal model needs to follow the complex rules to determine many special points, it is inconvenient for the implementation of the finite element analysis. Assume that the curve during an unloading-reloading cycle would not return to the same point of the envelope curve where it started to unload but to a point with lower stress, and the gap between the unloading point and the returned point can be explicitly given. The four expressions for cyclic

Due to the complexity of the hysteretic model and the time-consuming in finite element analysis, the fatigue constitutive relationship of the crack tip had been simplified [85,86]. For example, the unloading-reloading path in the mentioned Hordijk’s model was simplified as three straight lines in [86].

Based on the mentioned nonlinear fracture mechanics-based models, it can be indicated that nonlinear fracture mechanics could explain the process of concrete fatigue crack growth in detail. The fracture mechanics model was mainly used to analyze the fatigue growth characteristics of one or a few macro-cracks in members. In the finite element analysis, the cohesive elements must be set in advance along the fracture zone. The nonlinear property is used in the element of the fracture zone with the dense discretization, while the linear property is still used in the main body. But, there are many initial micro-cracks and micro-defects in the concrete’s interior. The cohesive crack model is difficult to describe the propagation and aggregation process of a large number of randomly distributed micro-cracks under the fatigue load.

4 Damage Mechanics-Based Fatigue Models

From the test results [14,87,88], the response of concrete under fatigue loading has obvious three-stage characteristics. For example, the total strain growth of concrete under constant amplitude fatigue load can be divided into three stages: the rapid increase at the first 10% of life, the stable development during the

As a branch of solid mechanics, damage mechanics is mainly used to study the degradation of macro-mechanical properties of material caused by the generation and expansion of internal micro-defects. This section reviews the development of fatigue damage theories.

In the damage mechanics, the constitutive equation can be expressed as:

Damage variable

where f is the gauge function. According to the orthogonal flow criterion, the evolution of the damage variable can be taken as follows:

where

Eq. (21) indicates that when the stress state isn’t beyond the damage surface, the damage will not increase regardless of the external loads change. Fatigue load can be divided into low cycle fatigue and high cycle fatigue loads according to the number of load cycles. The low cycle hysteretic behavior of structures under seismic loads has been easily obtained using the general damage model [90–92] or the construction of the hysteretic constitutive model [93 –95]. This section pays attention to the models for concrete structures under high-cycle fatigue loads. The stress state under high-cycle fatigue loading might always be within the damage surface, which means that there is always no damage evolution if the static damage model is adopted. Actually, fatigue loads could lead to damage accumulation of concrete even if the stress state is lower than the damage surface. When the hysteretic energy dissipation accumulates to a certain level, the structure will fail. Therefore, when it comes to the performance of structures under high cycle fatigue loads, the static model no longer has good predictability. To overcome the drawbacks of the conventional damage criterion, there are two approaches to solve the accumulation of fatigue damage. One is the bounding surface theory [96–98], and the other is fatigue loading-unloading criterion [99,100].

In the bounding surface theory [97], a limit fracture surface (LFS), a boundary surface (BS), and a loading surface (LS) changing with loading history were defined, as shown in Fig. 12. The damage begins to increase only when the loading surface under fatigue loading is outside the limit fracture surface and expands towards the direction of the boundary surface. The damage growth rate is related to the distance between a point on the loading surface and the corresponding mapping point on the boundary surface. In finite element calculations, many iterations and corrections are required, which will be time-consuming.

The fatigue loading-unloading criterion was proposed by Marigo [99] to judge whether fatigue damage evolves or not. The loading-unloading irreversibility concept not only can capture the damage accumulation within the damage surface but also is simple to apply. This concept means that the internal fatigue damage variables of concrete only increase in the rising stage of every load cycle. Interestingly, there are similar models in the study of the fatigue response of other materials [101]. Here, the damage consistency parameter was directly expressed as:

where

For a complete damage constitutive relationship, reasonable fatigue damage evolution laws are also very significant. The form of damage variable can be divided into the single scalar damage [102–107] and the anisotropic tensor damage [100,108–112]. The evolution of the single scalar damage under high-amplitude and low-cycle fatigue loading can be simply calibrated by the tests and accurately simulate the uniaxial hysteretic behavior of concrete [104,105,113]. The single scalar damage models are weak to reproduce fatigue response of concrete structures subjected to the high-cycle and low-amplitude fatigue loads, as well as multiaxial stress. Actually, the anisotropic damage model is more consistent with the anisotropic mechanical properties of concrete. The earliest anisotropic fatigue damage model for concrete was extended by Papa et al. [100] from the anisotropic static damage model. The total damage was decomposed into a second-order symmetric damage tensor D in deviatoric strain space and a scalar damage variable d in volumetric strain space. The evolutions for each component of damage are as follows:

and,

in which the sign “

It is assumed that the fatigue damage of concrete is mainly driven by tensile strain, and the evolution rate of the fatigue damage tensor was expressed in [108] as follows:

where n, K, and C1 are the material parameters,

Some bi-scalar elastoplasticity fatigue damage models for concrete were extended [109–111] in the frame of the static damage model [114–116]. In the bi-scalar damage model, the effective stress is split into positive and negative parts. The positive part is tension, and the negative part is compression. An isotropic scalar damage is assumed in the tension and compression space. Thus, the anisotropic damage is mapped into two isotropic spaces by the mapping tensors as follows:

in which

where

where

where

in which Es is the inherent energy of the representative volume element, Ef is the fatigue energy dissipation,

At present, the finite element analysis of the low cycle fatigue response of concrete structures can be easily realized. However, the number of cycles of fatigue load acting on a concrete structure sometimes is so large that it would undoubtedly lead to a huge amount of calculation to calculate the fatigue damage accumulation by the cycle-by-cycle integration in the finite element analysis. Therefore, an efficient numerical algorithm is important to realize the simulation for concrete structures under fatigue loading. Some algorithms, such as the cycle jumping algorithm [120–123], the dual temporal scales algorithm [109,124], and the temporal homogenization model [125,126], had been developed to simulate the fatigue process for concrete in a shorter time. Besides, research on various acceleration algorithms is still under exploration, and other algorithms such as the reduced-order modeling algorithm [127] also might attract the attention in the future to be introduced into the accelerated fatigue analysis of concrete.

The great advantage of applying the continuous damage mechanics to studying fatigue constitutive model of concrete is that it accounts for the nonlinear property on the material level without explicitly modeling micro-cracks in advance. The distribution of mechanical degradation in the fatigue process can be depicted by damage variables in the finite element analysis. Since the physical mechanism of concrete damage is not clear, a unified connection has not been established between the evolution of the quasi-static damage and the fatigue damage. To perform the refined analysis of the whole process of structural fatigue in practical engineering, it is required not only a detailed description of the fatigue properties of engineering materials but also the support of appropriate analysis methods and effective calculation techniques.

Machine learning has been utilized to predict the performance of materials or structures in civil engineering [128–136]. Due to the high uncertainty, the fatigue loading of concrete is a random process affected by many factors, such as loading period, specimen size, and environment. The deterministic fatigue models may not cover the combined effects of various factors that affect the fatigue resistance of concrete. Machine learning techniques can overcome the inherent limitation in conventional computing models.

Artificial neural networks (ANN), as a machine learning technique, are commonly used to estimate the fatigue life or fatigue strength of concrete, considering the material and dimensional properties of the test specimens and loading conditions. In ANN, there are three layers of neurons, namely input, hidden, and output layers. Each neuron of the hidden layer is connected to the neurons in the subsequent and previous layer by directed synapses with variable weights, as shown in Fig. 14. The hidden layer can be regarded as the regression module. The collected test data is input for training, and the prediction data can be output after the regression module. From Eq. (1), there are four quantities to determine the S − N curve, the compressive strength fc, themaximum stress σmax, the minimum stress σmin, and the ultimate loading cycles Nf. In [137], the database has been utilized from the published test literature, and the inputs were fc, σmin, and the ultimate loading cycles Nf. Through training, validation, and testing of the neural network, the maximum fatigue strength σmax was predicted as the output. It shows that the prediction accuracy is higher than the S − N expressions recommended in the codes. Other researches have been presented in this field. For example the material properties, dimensions, and loading conditions of components have been considered as inputs, and the fatigue life N − S as outputs is predicted after training of the neural network [138–142]. Moreover, machine learning is also a good option to estimate the fatigue failure reliability of structures [143–145].

Deep learning models have achieved remarkable results in image recognition. It is indicated that deep learning models such as the convolutional neural network (CNN), can be applied in crack detection and localization for concrete structures [146–148]. There are many CNN architectures which have been recently applied to crack and damage detection of concrete structures, such as AlexNet [149], ResNet [150], VGG [151], and so on. The general CNN architecture consists of five main layers of the neural network, including input, convolution, pooling, fully connected, and output layers, as shown in Fig. 15. The image data is input through the input layers, and the predicted results are stored in the output layers. The main objective of the convolution layers is to extract features in an image input with a convolution operator. The pooling layers are connected behind the convolution layers, and the purpose of introducing them is to simplify the output of the convolution layers. The fully connected layers are to take the output of the previous layer (i.e., the pooling layer) and then apply weights to predict the correct results. Besides, some auxiliary layers, such as dropout and batch normalization (BN) layers, can be added according to the research needs. It can be seen that automatic crack and damage detection with deep learning can help to evaluate the fatigue performance of structures in time in the future, although there are few applications at present. Furthermore, some deep learning models, such as AlexNet, GoogLeNet, ResNet, can also be implemented to mechanical property estimation through analyzing microscopic images in nondestructive testing [152].

Machine learning is expected to be a tool to interpolate or predict more results based on the limited experimental or finite element computational data without burden such as economy or computational time. At the same time, it is possible to realize the automatic structural performance detection by the crack identification function of deep learning. It can better serve the fatigue design of concrete to combine machine learning methods and conventional computing models. However, there is more work to be done across the field of concrete fatigue.

In this study, the development of fatigue analytical models of concrete is presented and discussed. According to this review, it can be concluded that:

• The research on concrete fatigue mainly includes experimental study, research on the crack growth, analysis of whole process response, and prediction using machine learning.

• The early experimental research results provide a certain basis for engineering life prediction; however, the empirical relationships between fatigue life and stress level obtained by the regression of experimental data obviously could not meet modern engineering needs.

• Based on fracture mechanics research, the fatigue model can limitedly reflect the physical mechanism of single crack growth under fatigue loading. However, it was difficult to describe the effect of several randomly distributed microcracks in concrete under complex stress.

• The damage-based fatigue models for concrete can realize the analysis of the whole process of concrete structures under fatigue loading. It can also be used to study the randomness of fatigue of the concrete structures.

• Machine learning provides a new idea for developing a fatigue prediction model of concrete.

• At present, the exploration of concrete fatigue analysis models and calculation methods which can be applied to practical engineering design faces great challenges, and further studies still need to be performed.

Acknowledgement: The authors wish to express their appreciation to the reviewers for their helpful suggestions, which greatly improved the presentation of this paper. Additionally, the second author wishes to appreciate the support from the Chinese Scholarship Council (CSC) under the Joint (Executive Program between Egypt and China (Program (2019–2023)).

Funding Statement: This work was supported by the National Natural Science Foundation of China (Grant Nos. 52078361 and 51678439) and Innovation Program of Shanghai Municipal Education Commission (Grant No. 2017-01-07-00-07-E00006).

Conflicts of Interest: The authors declare that they have no conflicts of interest to report regarding the present study.

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## Cite This Article

**APA Style**

*Computer Modeling in Engineering & Sciences*,

*134*

*(1)*, 9-34. https://doi.org/10.32604/cmes.2022.020160

**Vancouver Style**

**IEEE Style**

*Comput. Model. Eng. Sci.*, vol. 134, no. 1, pp. 9-34. 2023. https://doi.org/10.32604/cmes.2022.020160

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