Análise experimental da vida útil à fadiga de concretos submetidos à compressão cíclica de baixa frequência

Materia

article

Emerson Felipe Felix¹  Rogério Carrazedo¹  Edna Possan² 

[1] Universidade de São Paulo;Universidade Federal da Integração Latino-Americana

关键词: Concrete;    Cyclic compression;    Fatigue;    Low cycle fatigue;    Fatigue life;   

DOI  :  10.1590/1517-7076-RMAT-2021-45017

学科分类：工程和技术（综合）

来源: Universidade Federal do Rio de Janeiro * Coordenacao dos Programas de Pos-Graduacao de Engenharia

【 摘 要 】

The degradation of concrete by fatigue is related to deterioration and damage of the composite material when subjected to cyclic loading. In general, the deterioration of the material subjected to dynamic tests, occurs similarly to that of concretes subjected to static tests, however, the crack propagation mode, the propagation speed and the damage may be different depending on the loading rate at which the material is subjected. Besides, this work presents an experimental investigation aiming to evaluate the influence on the concrete fatigue behavior regarding the loading frequency, load intensity and the material’s compressive strength. Tests were carried out considering three loading frequencies (0.125, 0.25 and 0.5 Hz), two levels of maximum stress (50% and 70% of the compressive strength) and concretes made with three different compressive strength (30, 50 and 70 MPa). The results point out that as the loading frequency is increased, the fatigue life increases exponentially. However, it was observed that the fatigue life is shorter in high-strength concretes, i.e., the fatigue life has an inverse relationship with the compressive strength.

【 授权许可】

CC BY