Pressure-sensitive bond fatigue model with damage evolution driven by cumulative slip: Thermodynamic formulation and applications to steel- and FRP-concrete bond

Baktheer, Abedulgader; Chudoba, Rostislav

doi:10.1016/j.ijfatigue.2018.04.020

Cited by 31 publications

(18 citation statements)

References 38 publications

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“…the (L-H) and (H-L) scenarios deliver a reduced and extended fatigue life g, respectively. Similar results have been obtained numerically for the bond fatigue behavior between concrete and steel reinforcement [25,26]. The inversion of the sequence effect for different stress configurations demonstrates the high complexity of the problem behind the fatigue sequence effect.…”

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confidence: 79%

Experimental and theoretical evidence for the load sequence effect in the compressive fatigue behavior of concrete

Baktheer

Chudoba

2021

Mater Struct

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A realistic prediction of the concrete fatigue life exposed to high-cycle loading scenarios with variable amplitudes is of utmost importance for a reliable and economically efficient design of civil engineering infrastructure for transport and energy supply. Current design codes estimate the fatigue life under variable amplitudes using the Palmgren–Miner rule, which assumes a linear scaling between lifetimes measured for uniform cyclic loading scenarios. Several experimental series conducted in the past, however, indicate that this assumption is not valid and that it may lead to unsafe design. In this paper, an experimental and theoretical investigations of the fatigue loading sequence effect in normal- and high-strength concrete behavior are presented, which confirm this observation. In particular, a test campaign with 135 cylinder specimens, including three concrete grades and six different loading scenarios has been conducted. Several response characteristics of the fatigue behavior including Wöhler curves, fatigue creep curves and evolving shapes of hysteretic loops have been evaluated. To substantiate the experimental results, a theoretical explanation of the observed sequence effect is formulated based on the assumption, that energy is dissipated uniformly within the volume of a test specimen during subcritical, compressive cyclic loading. Then, superposition of energy dissipation profiles along the lifetime measured for constant amplitudes becomes possible and a theoretical justification of the experimentally observed sequence effect can be provided. Moreover, a reverse sequence effect reported in the literature for bending fatigue of concrete can then be explained by an unevenly distributed energy dissipation over a cracked specimen. Supported by the theoretical consideration, the processed experimental data is used to validate existing fatigue life assessment rules by testing their ability to reflect the load sequence effect.

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confidence: 79%

Experimental and theoretical evidence for the load sequence effect in the compressive fatigue behavior of concrete

Baktheer

Chudoba

2021

Mater Struct

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“…where the energy release rate threshold is Y 0 N = 1 2 E N (ε 0 N ) 2 and ε 0 N is the elastic threshold normal strain. The evolution laws are obtained by differentiating the flow potential for plasticity (12) and the damage threshold function (13) with respect to the thermodynamic forceṡ…”

Section: Microplane Constitutive Lawsmentioning

confidence: 99%

“…Tangential direction: To introduce a mechanism driving the material deterioration at subcritical load levels we assume that the tangential cumulative damage is the fundamental source of fatigue damage. The tangential behavior of a microplane is described using the pressure sensitive interface model with fatigue damage driven by cumulative inelastic slip presented in [13]. In this model the thermodynamic potential for the tangential state variables is given as…”

Section: Microplane Constitutive Lawsmentioning

confidence: 99%

Microplane damage plastic model for plain concrete subjected to compressive fatigue loading

Baktheer¹

2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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A thermodynamically based microplane fatigue damage model for plain concrete under compressive loading is introduced. The key idea of the present approach is to relate the fatigue damage to a cumulative measure of inelastic sliding/shear strains. Which reflects the fatigue damage accumulation owing to internal friction at subcritical fatigue loading level. The model is formulated within the microplane framework using a homogenization approach based on the energy equivalence principle with explicit representation of the effective triaxial elastic stiffness. The model can reflect the damage-induced anisotropic behavior of concrete and can reproduce the shape of the hysteretic loops related to the fatigue damage development within the tensorial representation of the material state. Elementary studies of the model response and its applicability to modeling of the fatigue response under compression are presented. The ability to reproduce the typical shape of the hysteretic loops is discussed and compared to the existing phenomenological fatigue models for concrete under compression.1 Table 1: General classification of approaches to modeling of concrete fatigue Lifetime based approaches Strain based approaches Strain approximations Damage approximations Tensorial models Microplane models Discrete models Liu [1] Pfanner [2] Alliche [4] Desmorat [6] Kirane and Bazant [8] Wang [9]

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“…The conducted beam-end tests can be simulated using a bond fatigue model developed recently by the authors [13,14]. The model is based on a coupled damage and inelastic sliding within the bond interface with sensitivity to the lateral pressure/tension.…”

Section: Numerical Modelling Of Beam-end Testsmentioning

confidence: 99%

Experimental Characterization of Bond Fatigue Using Beam-End Tests with Push-In Loading

Camps

Baktheer

Hegger

et al. 2018

The 18th International Conference on Experimental Mechanics

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Realistic characterization of fatigue loading resistance is a paramount for an economical and reliable structural design of reinforced concrete (RC) and prestressed concrete (PC) structures. The need for innovative experimental methods for the characterization of fatigue behavior is driven by the current aims to construct wind turbine towers that must resist up to N = 10 7 loading cycles corresponding to 25 years of service life. Considering the number of possible configurations with regard to structural geometries, cross-sectional layout of reinforcement and loading scenarios, experimental data are required that capture the key mechanisms driving the fatigue damage between the reinforcement and concrete matrix. Experimental investigations of bond behavior under fatigue loading have been reported in the literature in the 90′s of last century. Since then, no systematic investigation of bond fatigue behavior has been published. As a consequence, no assessment rules are available for the bond fatigue, only separate assessment rules for concrete and steel. The present paper will report on the ongoing research of bond fatigue behavior using the beam-end test setup. The test campaign includes the push-in loading with the goal to provide data characterizing the compressive behavior of reinforced cross sections in wind turbine towers.

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Pressure-sensitive bond fatigue model with damage evolution driven by cumulative slip: Thermodynamic formulation and applications to steel- and FRP-concrete bond

Cited by 31 publications

References 38 publications

Experimental and theoretical evidence for the load sequence effect in the compressive fatigue behavior of concrete

Experimental and theoretical evidence for the load sequence effect in the compressive fatigue behavior of concrete

Microplane damage plastic model for plain concrete subjected to compressive fatigue loading

Experimental Characterization of Bond Fatigue Using Beam-End Tests with Push-In Loading

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