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Critical region method-based fatigue life prediction of notched steel wires of long-span bridges

Yafei Ma,Guodong Wang,Zhongzhao Guo,Lei Wang,T. Jiang,Jian-ren Zhang

Published 2019 in Construction and Building Materials

ABSTRACT

Abstract Huge uncertainty exists in the corrosion process, and the dimensions of corrosion pits are quite random in practical engineering. Corrosion pit-induced stress concentration accelerates the initiation of fatigue cracks, ultimately reducing the fatigue life of bridge sling. This paper proposes a critical region method to predict the fatigue life of notched steel wires. This method considers the critical distance and the average stress amplitude of notched specimen. Fatigue loading tests on various notched steel wires are performed to simulate the effects of corrosion pit morphologies on the performance of steel wires. The relationships between notch dimensions and the fatigue lives of specimens are discussed. Following that, a fine-mesh three-dimensional solid model of notched steel wire is established by finite element method. The stress concentration coefficients and the stress distribution near the notch root are investigated, and the critical distance is also determined according to the local stress gradient of notched steel wire. The critical region-based fatigue life prediction method is validated using experimental fatigue life results of notched steel wires. A good agreement is observed between the theoretical predictions and experimental observations.

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