Evaluation of methods for calculating reinforced concrete structural members for the fatigue limit state

Contained in the design codes of reinforced concrete structures, since 1962 and to the present, the method of calculating the endurance was compiled taking into account the generalization and analysis of data from numerous experimental and theoretical studies. Subsequent use of this method in the practice of designing reinforced concrete structural members has shown that during the operation of structural members properly designed with the requirements for fatigue destructions did not occur. At the same time, the analysis showed the difference between the domestic method and the approaches of foreign standards in terms of fatigue verification for reinforcing and prestressing steel. Further research has shown some imperfections in the method of design for fatigue of steel (both reinforcing and prestressing steel). Taking into account the data of the conducted computational and theoretical studies, as well as in order to harmonize with the main provisions of the fatigue calculation adopted in the design standards of a number of leading countries, it is useful to take into account the ultimate stress range along with the maximum stress within the load cycle. In this regard, it is planned to update the existing methodology for calculating for fatigue, which will be supplemented with new provisions for calculating of reinforcing and prestressing steel for fatigue. When updating the methodology, it is most appropriate to take into account other provisions of the existing methodology as much as possible. In particular, the previous approach to determining the internal stresses in concrete and reinforcing steel, as well as the calculation of fatigue for concrete under compression, will be maintained.

Reinforced concrete members, calculation method, limit state, fatigue strength, reinforcing steel, prestressing steel, stresses, stress range, reinforcing and prestressing steel class

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