A general equation for estimation of time-dependent prestress losses in prestressed concrete members

Wang, W; Gong, Jinxin; Wu, Xueping; Wang, Xingchao

doi:10.1016/j.istruc.2023.06.023

Cited by 4 publications

(1 citation statement)

References 22 publications

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“…For the simplified method, the analysis is based on the equations of prestress loss in design codes [19,20] and ignores the influence of the steel liner and mild steel rebars in two directions, as well as the interaction of concrete creep resulting from the two-way prestressing strands (see Figure 1). However, some studies [1,21] have found that the presence of mild steel rebars affects the stress distribution in the structure and thus may have a significant impact on the time-dependent prestress losses. At the same time, the presence of the steel liner and the interaction of prestress in two directions of the prestressed concrete containment also limit the deformation of the concrete and affect the time-dependent prestress losses.…”

Section: Introductionmentioning

confidence: 99%

Two-Way Time-Dependent Prestress Losses of Prestressed Concrete Containment with Bonded Prestressing Strands

Wu,

Wang,

et al. 2023

Buildings

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Prestressing plays a pivotal role in ensuring the tightness and integrity of prestressed concrete containment in nuclear power plants. The prestress loss reduces the compressive stress in concrete resulting from the prestressing strands and increases the risk of containment leakage under severe accident conditions. Therefore, the accurate prediction of prestress loss is essential for the design and in-service management of prestressed concrete containment. Unlike one-way beams or girders in building structures and bridges, two-way prestressing systems are used in prestressed concrete containment. In the current simplified method for evaluating time-dependent prestress loss, the interaction of concrete creep in two directions resulting from the two-way prestressing strands and the influence of the steel liner and mild steel rebars in two directions are neglected. In this study, based on the principle of creep superposition, the age-adjusted effective method for the creep estimation of concrete, and considering concrete shrinkage, concrete creep, and the relaxation of prestressing strands, as well as the influence of the steel liner and mild steel rebars in two directions, a sectional analysis is performed for prestressed concrete containment with bonded prestressing strands, and equations for calculating the two-way time-dependent prestress losses are derived. The results of the two-way time-dependent prestress losses predicted by the derived equations are compared with those of tests in the literature, and great agreement is achieved. Finally, a case study is given to show the application of the proposed method for the prediction of prestress loss in prestressed concrete containment in the nuclear power plant.

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Section: Introductionmentioning

confidence: 99%