A Method for Predicting the Remaining Fatigue Life of Concrete Members

Abstract

The invention discloses a method for predicting the remaining fatigue life of concrete components, which is a simpler and more convenient way to effectively predict the fatigue life of concrete under variable amplitude fatigue loads. The basic concept is that the damage condition of concrete when loaded for ni cycles under the stress level Si is equivalent to that when loaded for n1 cycles under the reference stress level S1. For any i, the number of cycles nit of concrete loading under the reference stress level S1 can be obtained when it is equivalent to loading the concrete damage of ni cycles under the stress level Si.

Description

technical field [0001] The invention relates to a method for predicting the remaining fatigue life of concrete components, in particular to a model for predicting the remaining loading times when the concrete components are subjected to variable amplitude loads. Background technique [0002] Currently, bridges, roads and offshore structures are constructed of concrete, however, they are often subject to repetitive fatigue loads. Therefore, these structures must have sufficient resistance to resist various types of fatigue loads. Since real structures are subjected to variable amplitude fatigue loads, it is necessary to establish a real model to accurately evaluate the fatigue damage accumulated inside the structure under such loading conditions. [0003] In practical situations, civil engineering structures are often subjected to cyclic loads of different amplitudes. It is well known that the fatigue behavior of concrete under loads of different amplitudes is different fro...

AI Technical Summary

Problems solved by technology

The most notable disadvantage is that the effect of the sequence of application of different stress levels is not considered, and failure is assumed to be an accumulation at the same rate for a given stress level, without taking into account past stress history

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