EXPERIMENTAL STUDY ON CONCRETE UNDER FATIGUE LOADS

Paper ID: EIJTEM_2019_6_4_20-28

Author's Name: Deepika kundarapu, Arunteja kolahalam, Chandarakanth Kethavath , Manju Bhukya , Sainaveen.Lagishett

Volume: 6

Issue: 4

Year: 2019

Page No: 20-28

Abstract:

The life-cycle performance of concrete structures is greatly impacted by the fatigue response of concrete under cyclic or repetitive loading situations, and this study makes a contribution by consolidating knowledge on the fatigue behaviour of concrete. Cyclic loading occurs at various stress levels on a variety of structures, including bridges, buildings, and industrial structures. The material's cyclic loading-induced fatigue effects would determine how the structure degraded and how much maintenance was needed. In this respect, the current study assesses the fatigue response of M40 concrete under cyclic loading at various stress levels. Also, efforts are undertaken to contrast the effectiveness of standard concrete (M40) and high strength concrete (M70). Using a cylindrical specimen of M40 concrete, low frequency cyclic loading has been done at three different stress levels,60%, 75% and 90% compressive strength of cylindrical specimen. At 75% stress levels the response of M40 and M70 concrete has also been compared. From the study, for cyclic loading it can be inferred that the fatigue life of concrete is inversely proportional to the stress level for cyclic loading. As stress level reduces, the failure is observed to be more brittle in nature.High strength concrete (M70) survives lower number of cycles and exhibits relatively brittle failure as compared to M40 concrete for the same stress level. Fatigue response of concrete, degradation in its properties and residual strength for further life can be evaluated and concluded from the study

Keywords: Fatigue Loads, Compressive Strength, Life cycle, Stress-strain response, Cyclic loading.

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