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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5. Results and Discussion

5.1. Energy Dissipation Capacity The energy dissipation capacity refers to a structure's ability to absorb and dissipate energy during earthquake events without experiencing excessive damage. Engineers employ various techniques to enhance this capacity, including adding steel reinforcement, utilizing pre-stressed concrete, and integrating damping systems. These measures enable structures to dissipate energy effectively during seismic events, minimizing the risk of catastrophic failure and ensuring occupant safety. The energy dissipation capacities of the system walls were evaluated by measuring the total amount of energy dissipated under cyclic loading. It was observed that the energy dissipation capacity of the precast walls increased steadily due to the yield energy dissipation of the Flexural Plates (FPs). The energy dissipation ratio of the systems with FPs exhibited a modest increase after drifting began, indicating that the wall's energy dissipation capability remained stable. The FPEDs device, positioned in the corner of the wall panels, underwent plastic deformation due to the relative vertical displacement of the walls, as shown in Figure 11. This action transformed the FPEDs into yielding dampers, enhancing the energy dissipation capacity of the system. The study demonstrates that the proposed self-centering wall system (FPEDs) exhibits a stable hysteretic response, as depicted in Figure 9. The corner dissipators effectively enhance the energy dissipation capacity of the wall while preserving its self-centering ability, showcasing superior self-centering capabilities. Furthermore, increasing the thickness of the energy dissipation device improves the energy dissipation, bearing capacity, and stiffness of the wall system, as shown in Figures 8 and 9. Figure 10 illustrates the skeleton curve of the self-centering precast shear wall model with an FPEDs device.

Fig. 6. The FPEDs device.

Fig. 7. FEM meshing in Abaqus of HW1 wall specimen.

Fig. 8. Energy dissipation-cyclic behaviour of FPEDs specimen under cycle loading.

Fig. 9. Load-displacement behaviour of FPEDs specimen under cycle loading.