A strain model for fatigue‐loaded concrete

Abstract

Funding informationDeutsche Forschungsgesellschaft (DFG) "Extension and Verification of an Energetic Fatigue Model of Cyclic Loaded Concrete".In this contribution, an additive strain model is used to describe the deformation behavior of concrete. The model assumes that elastic, viscous, thermal, and damage-induced strains occur in concrete. The strain components develop independently of each other as a function of the number of load cycles, test duration, and characteristic parameters of the stress cycles. The focus of this paper is on the determination of a creep-relevant stress level to estimate the magnitude of the viscous deformation component as a function of the fatigue stress. Experimentally measured strains of fatigue-loaded concrete specimens are divided into the strain components assumed by the additive strain model and analyzed. The investigations yield new insights into the strain and material behavior of fatigue-loaded concrete. K E Y W O R D S additive strain model, concrete, creep-relevant stress level, fatigue loading, strain behavior

Stress configuration‐based classification of current research on fatigue of reinforced and prestressed concrete

“…The primary objective of this approach is its applicability to large scale testing and high‐cycle fatigue scenarios. This model adapts the linear elastic material model by introducing a reduction of the material stiffness at a certain number of loading cycles based on the uniaxial additive strain model proposed 130 . It should be noted, however, that this simplified approach can only provide a qualitative approximation of the structural redistribution process without a direct link to the underlying fatigue degradation mechanisms.…”

Rheological Model to Describe the Cyclic Load-Bearing Behaviour of Strain-Hardening Cement-Based Composites (SHCC)

“…Such descriptions for the material behaviour of concrete have been suggested by Burgers, and separately Duda [28], among others. A cyclic supplement to existing rheological concrete models has been proposed by Kessler-Kramer [29] and von der Haar [30] for discussion.…”

“…Von der Haar's model [30] was chosen as the basis for the concrete matrix's modelling. The model includes both the linear-elastic part of the deformations and the creep of the material over the loading period.…”

“…The resulting scheme of the rheological model for the SHCC matrix is given in Figure 13 and compared to the original model as formulated by von der Haar and Marx [30].…”

Characterization of high-strength concrete under monotonic and fatigue mode II loading with actively controlled level of lateral compression

“…To tackle this task, numerous studies have been conducted in the field of concrete fatigue, addressing diverse topics such as moisture content [1][2][3][4][5], loading frequency and temperature [6][7][8], loading type [9][10][11][12][13][14][15][16] as well as loading sequence and variable amplitude [17][18][19][20][21]. Moreover, various fracture mechanics-and phenomenology-based approaches have been developed to describe the progressive degradation processes that occur during concrete fatigue [22][23][24][25][26][27][28][29].…”