PSI - Issue 64

Nouraldaim F.A. Yagoub et al. / Procedia Structural Integrity 64 (2024) 105–113 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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forces, such as seismic events. As illustrated in Figure 14 a, b, and c, increasing the thickness of FPEDs enhances energy dissipation capacity but may lead to a decrease in wall self-centering capability. This trade-off between energy dissipation and self-centering capability underscores the importance of optimizing FPED thickness to achieve the desired balance between structural resilience and performance.

(c)

(a)

(b)

Fig. 14. Impact of flexural plate thickness in the form of hysteresis curves.

5.4. Residual Drift

Residual drift refers to the permanent deformation or displacement that a structure retains after experiencing a seismic event. This residual displacement occurs when the structure fails to return to its original position due to damage or other factors. Minimizing residual drift is crucial for ensuring structures can withstand seismic events and maintain their integrity and functionality over the long term. Figure 16 illustrates the residual drift of the systems under cyclic stress. It's observed that the remaining displacement is minimal, leading to self-centering of the wall. Notably, the residual displacement of flexural plate thickness 20mm is less than that of thicknesses 25mm and 30mm. Specifically, the flexural plate thickness of 30mm exhibits more significant residual drift compared to the thickness of 20mm, primarily due to its greater thickness. Therefore, it can be inferred that the initial PT force and the thicknesses of the FPEDs primarily determine the wall's ability to return to its original position. Walls with higher initial PT force and thinner FPEDs demonstrate superior self-centering capabilities. Figure 15 demonstrates the impact of thickness on the energy dissipation of the model; as thickness increases, the cumulative energy dissipation effectively rises.

6. Conclusions This study introduces and evaluates a reinforced concrete post-tensioned precast wall integrated with replaceable Flexural Plate Energy Dissipators (FPEDs) as energy-dissipation devices under seismic loading. A series of system walls underwent reversed cyclic lateral loading tests, revealing the favorable performance of precast concrete walls with FPEDs. These walls exhibited reduced residual drifts and improved energy dissipation. The self-centering walls, equipped with FPEDs, demonstrated commendable energy dissipation, self-centering ability, load-bearing capacity, and minimal damage. Notably, they exhibited superior initial stiffness and higher load-bearing capacity compared to self-centering walls without energy dissipation. The self-centering ability, initial stiffness, and bearing capacity were significantly influenced by the prestressing force. Additionally, the bending yield of FPEDs primarily contributed to energy dissipation. Increasing the thickness of FPEDs led to a progressive enhancement in the wall's energy dissipation capability, albeit at the expense of reduced self-centering capacity. These findings underscore the potential of removable energy-dissipation devices in unbonded post-tensioned precast concrete walls to mitigate damage and displacement during seismic events while offering a cost-effective solution. Fig. 15. Cumulative energy dissipation. Fig. 16. Residual drift.