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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Fig. 11. Deformation of FPEDs for FEM simulation.

Fig.10. Comparison of skeleton.

5.2. Impact of Post-Tensioned Strands

5.2.1. The Initial Value of the Prestressing Force The incorporation of post-tensioned (PT) strands in concrete structures significantly affects energy dissipation. PT strands, composed of high-strength steel, are tensioned within the concrete system, imparting additional strength and stiffness. During seismic events, the PT strands release stored energy by transferring loads to the reinforced concrete post-tensioned precast wall components. This mechanism helps mitigate localized damage and reduces the risk of collapse. The energy dissipation capacity of PT strands depends on factors such as the number and size of strands, tension levels, and structural design. Generally, systems with more PT strands and higher tension exhibit greater energy dissipation capacity. However, it's crucial to ensure correct design and installation to avoid introducing new risks. Figure 12 illustrates that increasing the initial PT force enhances the bearing capacity, initial stiffness, and self-centering capacity of the precast wall model. 5.2.2. Location of Post-Tensioned Strands Figure 13 depicts the aperture of the joint between the wall and foundation, which predominantly influenced the responses of HW1. Tensioning the joint-crossing rebars and bonding them with the wall panel's concrete generates horizontal stresses. As lateral load displacement increases, these stresses intensify horizontally. However, nonlinear deformation, concentrated at the wall panel-to-base joint, keeps stress levels relatively low. The primary contributors to the lateral rigidity of self-centering RC walls are the PT strands. According to (Lu and Wu, 2017), damage state, and self-centering capability hinge on PT strand deformations and locations. This research investigates the locations of self-centering elements by exploring various PT strand positions in RC shear wall cross sections. Figure 13 displays the hysteretic and energy dissipation results of the created variants of FPEDs.

Fig. 13. Effects of PT position on the hysteretic performance of the wall.

Fig. 12. Effect of initial stress of PT strands.

5.3. Impact of Flexural Plate Thickness Understanding the factors influencing the energy dissipation of flexural plate energy dissipators (FPEDs), such as plate material properties and structural design, is crucial for ensuring optimal performance and safety. Therefore, this study examines the impact of plate thickness on energy dissipation to enhance performance. The research reveals that plate thickness significantly affects the energy dissipation of the model. Generally, thicker plates exhibit higher energy dissipation capacity compared to thinner ones. This is attributed to their ability to absorb and distribute more energy over a larger area. Thicker plates possess more material to deform when subjected to external