PSI - Issue 70

Pradhumn Agrawal et al. / Procedia Structural Integrity 70 (2025) 113–120

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3.2 Base Shear It is a function of spectral acceleration, influenced by the mass and stiffness of the structure shown in Fig. 6. This also increases due to higher spectral acceleration and shorter time period, when comparing set-back structures with step-back and set-back configurations, the base shear is comparatively lower. Additionally, incorporating soil structure interaction (SSI) at the base enhances the structure's flexibility, leading to a reduction in base shear.

Fig .6. Base shear Variation

3.3 Displacement Displacement increases along storey height and decrease with increment of slope as shown in Fig.7.a and Fig.7.b. The taller side of the models exhibits greater displacement compared to the shorter side, indicating that the portion of the structure located at base level of the slope is more flexible than the higher side. Additionally, models incorporating soil-structure interaction (SSI) demonstrate higher displacement values when compared to those with a fixed base.

1 1 2 0 5 0 2 3 3 5 0 5 4 5 4 5 0 0 5 0 displacement(mm)

1 1 2 0 5 0 2 3 3 5 0 5 4 4 5 0 5 0 5 0 displacement(mm)

S S t t o o r r e e y y 5 2 S S t t o o r r e e y y 4 1 Storey 3

S S t t o o r r e e y y 5 2 S S t t o o r r e e y y 4 1 Storey 3

Fig. 7.a. Displacement variation without considering SSI

Fig. 7.b. Displacement variation considering SSI