Feasibility study of a prestressed-concrete containment vessel for a novel GFR nuclear reactor

Holan, Jakub; Bílý, Petr; Štefan, Radek; Vácha, Petr

doi:10.1016/j.engstruct.2023.116119

Cited by 3 publications

(1 citation statement)

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“…Stepping into an eco-friendly society, there is an increasing demand for material and energy saving, such as recycled aggregate and mineral tailings, which show great potential in mortar and concrete production [1][2][3]. Construction material, prestressed concrete (PC) with such virtue, has had an expanded usage market in recent years, including in public buildings, industrial and civil buildings [4][5][6] and railway bridges. Due to the complexity regarding the seismic performance of PC structures in previous studies, the installation and safety evaluation of PC structures in earthquake fortification areas and highintensity areas is facing remarkable obstacles, which makes the application and promotion of PC technology greatly restricted [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Effects of Prestressing Magnitude and Position on Seismic Performance of Unbonded Prestressed Concrete Beams

Chen,

Zeng,

et al. 2024

Buildings

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To study the effects of the jacking stress level, height and strength ratio of the prestress tendons (λ) on the seismic performance of unbonded prestressed concrete (UPC) beams, six UPC beams and one reinforced concrete (RC) beam were tested under cyclic loads. The hysteretic characteristics, skeleton curves, ductility properties, energy dissipation capacity, strain distribution of reinforcement and self-centering capability of the specimens were studied and discussed. Numerical parameter analysis was also carried out by using OpenSees. The results indicate that three failure modes of UPC beams under cyclic loading were observed, namely the tension-failure mode involving a broken rebar, the compression-failure mode involving concrete crushing and the balanced failure. By considering the influence of the prestress position and magnitude, the modified reinforcing index ω was proposed to determine the failure mode. The ω is suggested to be less than 0.3 to ensure sufficient ductility. The effective stress level is linearly and positively related to the stiffness from cracking to yield Kcr and the ultimate bearing capacity of the UPC beam under cyclic loading. The stiffness of the UPC beam is slightly larger than that of the RC beam before yielding, and significantly greater than that of the RC beam after yielding. Due to the large strength reserve after yielding, the integrated seismic performance of the UPC beam is similar to that of the RC beam. When the λ was unchanged, the increase in the relative height of the prestressed tendons αh is beneficial for the overall performance factor F, ductility and crack control. The stiffness degradation performance depends on the λ but is independent of the αh. The total energy dissipation of the non-tensioned UPC specimen was 59% higher than that of the RC beam. The cumulative total energy dissipation of the tensioned UPC specimen was only 13% lower than that of the RC beam with the same number of cycles, indicating that the UPC specimen had a considerable energy dissipation capacity.

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