scholarly journals Mode II Behavior of High-Strength Concrete under Monotonic, Cyclic and Fatigue Loading

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7675
Author(s):  
Henrik Becks ◽  
Martin Classen
Keyword(s):  
Fatigue Life ◽  
Compressive Stress ◽  
Fatigue Damage ◽  
High Strength Concrete ◽  
High Strength ◽  
Fatigue Loading ◽  
Mode Ii ◽  
Shear Tests ◽  
Strength Concrete ◽  
Mode Ii Loading

An economically efficient yet safe design of concrete structures under high-cycle fatigue loading is a rather complex task. One of the main reasons is the insufficient understanding of the fatigue damage phenomenology of concrete. A promising hypothesis states that the evolution of fatigue damage in concrete at subcritical load levels is governed by a cumulative measure of shear sliding. To evaluate this hypothesis, an experimental program was developed which systematically investigates the fatigue behavior of high-strength concrete under mode II loading using newly adapted punch through shear tests (PTST). This paper presents the results of monotonic, cyclic, and fatigue shear tests and discusses the effect of shear-compression-interaction and load level with regard to displacement and damage evolution, fracture behavior, and fatigue life. Both, monotonic shear strength and fatigue life under mode II loading strongly depend on the concurrent confinement (compressive) stress in the ligament. However, it appears that the fatigue life is more sensitive to a variation of shear stress range than to a variation of compressive stress in the ligament.

Influence of the pore morphology of high strength concrete on its fatigue life

2018 ◽  
Vol 112 ◽  
pp. 106-116 ◽  
Author(s):  
Miguel A. Vicente ◽  
Dorys C. González ◽  
Jesús Mínguez ◽  
Manuel A. Tarifa ◽  
Gonzalo Ruiz ◽  
...  
Keyword(s):  
Fatigue Life ◽  
High Strength Concrete ◽  
High Strength ◽  
Pore Morphology ◽  
Strength Concrete

Microstructural analysis to uniaxial low cyclic compression of high-strength concrete after high temperature

2018 ◽  
Vol 22 (3) ◽  
pp. 779-791
Author(s):  
Dongfu Zhao ◽  
Penghe Jia ◽  
Pingying Hou ◽  
Huixuan Liu ◽  
Rundong Zhao ◽  
...  
Keyword(s):  
High Temperature ◽  
Fatigue Damage ◽  
High Strength Concrete ◽  
Fatigue Testing ◽  
Low Cycle Fatigue ◽  
Microstructural Analysis ◽  
High Strength ◽  
Strength Concrete ◽  
Microstructural Parameters ◽  
The Relationship

The uniaxial compressive cycling tests of high-strength concrete after high temperature under different stress were carried out using the electrohydraulic servo-controlled fatigue testing system. The investigation focused on low-cycle fatigue to figure out the relationship between microstructural development and number of cycles. The variation in microstructure during uniaxial compressive fatigue process was systematically analyzed and compared using ultrasonic, micro-hardness test, mercury intrusion porosimetry, and scanning electron microscopy. It is found that at the same life ratio, the cumulative fatigue damage caused by the lower stress is greater than that caused by the higher stress, and the four kinds of test methods used to measure the microstructure are consistent, interrelated, and confirmed with each other well. Through the nonlinear regression analysis of fatigue residual strain and microstructural parameters, the relationship models between them were established. Furthermore, the fatigue damage models based on microstructural parameters were established. On this basis, both the dynamic evolution process and damage mechanism of microstructure during uniaxial compressive fatigue were further revealed.

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