Abstract
Prestressing steel wires are commonly used as reinforcement elements in structures bearing fatigue loads. These wires are obtained by a conforming process called cold drawing, where a progressive reduction of the wire diameter is produced, causing residual stress in the commercial wire. The aim of this paper is to analyze the effect of diverse in-service cyclic loading conditions (cyclic loading and cyclic loading with overload) on such a residual stress field. To achieve this goal, firstly, a numerical simulation of the wire drawing process of a commercial prestressing steel wire was carried out to reveal the residual stress state induced by the manufacture technique. Afterwards, a numerical simulation was performed of the in-service loading conditions of a prestressing steel wire in which the previously calculated residual stress state is included. The analysis of the obtained results shows a significant reduction of the residual stress state of about 50% for common in-service loadings and as high as 90% for certain cases undergoing overloads during cyclic loading. Therefore, an improvement of the mechanical performance of these structural components during their life in-service can be achieved.
Highlights
Many concrete structures in civil engineering use prestressing steel wires as reinforcement elements bearing fatigue loads
A number of cycles (N) of 10 was applied in accordance to the null effect of this parameter, accounting for the results presented in previous analyses [20,21]
Considering the significant stress reductions obtained after cyclic loading, the exposed approach has many advantages from an engineering design point of view, since a significant reduction of tensile residual stresses at the wire surface is achieved by applying common values of the in-service cyclic loadings
Summary
Many concrete structures in civil engineering use prestressing steel wires as reinforcement elements bearing fatigue loads. Residual stresses appear in cold-drawn pearlitic steel wires due to the non-uniform distribution of plastic strain during wire drawing [1] Such residual stresses are a problem of major concern in engineering, since they can produce—under certain conditions—the catastrophic failure of structural components such as prestressing steel wires [2]. A reduction of the residual stress state yields to a reduction of the HE susceptibility of prestressing steel wires, thereby reducing the risk of in-service failure. The effects of diverse cyclic loading scenarios on the residual stress field generated by cold drawing are analyzed To achieve this goal, firstly, a numerical simulation by the finite element (FE) method was carried out for estimation of the residual stress distribution in a real (commercial) prestressing steel wire. A wire with the aforementioned residual stress field was simulated by FE under different in-service fatigue load cases to reveal the effect of the cyclic loading scheme
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