Fatigue Resistance of Steel Fiber-Reinforced Concrete Deep Beams

Isojeh, Benard; El-Zeghayar, Maria; Vecchio, Frank J.

doi:10.14359/51700792

Cited by 28 publications

(13 citation statements)

References 10 publications

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“…The knowledge about the fatigue behavior of materials under controlled loading conditions also serves to interpret fatigue testing on structural elements [19,20,21]. In the past, experiments have been carried out regarding the fatigue life of deep beams [22,23,24,25], shear-critical concrete beams [19,26,27,28,29,30,31,32,33,34], and shear-critical slabs [35]. The loading conditions are important for structural tests; research [36] indicates that the fatigue life under moving loads is lower than under cycles of loading applied at a single position.…”

Section: Introductionmentioning

confidence: 99%

ANN-Based Fatigue Strength of Concrete under Compression

Abambres

Lantsoght

2019

Materials

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When concrete is subjected to cycles of compression, its strength is lower than the statically determined concrete compressive strength. This reduction is typically expressed as a function of the number of cycles. In this work, we study the reduced capacity as a function of a given number of cycles by means of artificial neural networks. We used an input database with 203 datapoints gathered from the literature. To find the optimal neural network, 14 features of neural networks were studied and varied, resulting in the optimal neural net. This proposed model resulted in a maximum relative error of 5.1% and a mean relative error of 1.2% for the 203 datapoints. The proposed model resulted in a better prediction (mean tested to predicted value = 1.00 with a coefficient of variation 1.7%) as compared to the existing code expressions. The model we developed can thus be used for the design and the assessment of concrete structures and provides a more accurate assessment and design than the existing methods.

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Section: Introductionmentioning

confidence: 99%

ANN-Based Fatigue Strength of Concrete under Compression

Abambres

Lantsoght

2019

Materials

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“…where, N = number of cycles; s = damage parameter; Dcr = critical damage value; and Cf accounts for fatigue frequency. From different investigation reports in the literatures have shown that the concrete strength and the stiffness reduce progressively after fatigue loading cycles have been applied [28][29][30][31][32][33][34]. To account for this, concrete strength may be modified by using a damage factor .…”

Section: Degradation In Residual Strength and Secant Modulusmentioning

confidence: 99%

“…Compressive and tensile plastic strains accumulate in concrete under fatigue loading [28][29][30][31][32][33][34]. However, the magnitude in tension is usually small, and it is reasonable to assume it to be null.…”

Section: Irreversible Strain Accumulation Modelmentioning

confidence: 99%

Analysis of fatigue strain, fatigue modulus and fatigue damage for the model formulation of concrete based on strain life approach

Yadav¹,

Thapa²

2019

JSEAM

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Analysis of Fatigue Strain, Fatigue Modulus and Fatigue Damage for the modeling of concrete plays a vital role in the evolution material behavior which is heterogeneous and anisotropic in nature. The LevelS nonlinear fatigue strain curve, fatigue modulus curve, residual strain curve of concrete in compression, tension, flexure and torsional fatigue loading were proposed using strain life approach. The parameters such as physical meaning, the ranges, and the impact on the shape of the curve were discussed. Then, the evolution model of fatigue modulus was established based on the fatigue strain, fatigue modulus, residual strain and secondary strain evolution model. The hypothesis of fatigue modulus is inversely related with the fatigue strain amplitude. The fatigue evolution of concrete damages the bond between material grains, changed the orientation of structure of molecules and affects the elastic properties resulting in the reduction of material stiffness and modulus by formation of microcracking, macro cracking, cracking and finally damage. This paper presents the Fatigue Strain Life Model and analysis of fatigue strain, fatigue modulus and damage parameters of concrete which is capable of predicting stiffness degradation, inelastic deformation, strength reduction under fatigue loading and experimental results were employed for the validation of the theoretical Model.

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“…The summarized experiments are unique in nature, as the tested specimens give us insight in the behavior of slab-between-girder bridges as a structural system. Most fatigue testing in the past focused on testing small specimens [22,23] or structural elements [24][25][26][27][28][29][30][31] instead of structural systems. The insights from these experiments are now reported for the first time in the context of bridge assessment.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Assessment of Prestressed Concrete Slab-between-Girder Bridges

Lantsoght¹,

Koekkoek²,

Veen³

et al. 2019

Preprint

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In the Netherlands, the assessment of existing prestressed concrete slab-between-girder bridges showed that the thin, transversely prestressed slabs may be critical for static and fatigue punching when evaluated using the recently introduced Eurocodes. On the other hand, compressive membrane action increases the capacity of these slabs and changes the failure mode from bending to punching shear. To improve the assessment of the existing prestressed slab-between-girder bridges in the Netherlands, two 1:2 scale models of an existing bridge, the Van Brienenoord Bridge, were built in the laboratory and tested monotonically as well as under cycles of loading. The result of these experiments is: 1) the static strength of the decks, showing that compressive membrane action significantly enhances the punching capacity, and 2) the Wöhler curve of the decks, showing that compressive membrane action remains under fatigue loading. The experimental results can then be used for the assessment of the most critical existing slab-between-girder bridge. The outcome is that the bridge has sufficient punching capacity for static and fatigue loads, and thus that the existing slab-between-girder bridges in the Netherlands fulfil the code requirements for static and fatigue punching.

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Fatigue Resistance of Steel Fiber-Reinforced Concrete Deep Beams

Cited by 28 publications

References 10 publications

ANN-Based Fatigue Strength of Concrete under Compression

ANN-Based Fatigue Strength of Concrete under Compression

Analysis of fatigue strain, fatigue modulus and fatigue damage for the model formulation of concrete based on strain life approach

Fatigue Assessment of Prestressed Concrete Slab-between-Girder Bridges

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