STABILITY OF RIGID BLOCKY STRUCTURES ON UNIFORM SAND SUBJECT TO HARMONIC HORIZONTAL BASE EXCITATION

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4. STABILITY OF RIGID BLOCKY STRUCTURES ON UNIFORM SAND SUBJECT TO HARMONIC HORIZONTAL BASE EXCITATION

Numerous researchers previously investigated the behaviour of stiff constructions on rigid bases or deformable media, such as soil. For both structural and geotechnical engineers, the behaviour of a rigid structure on the soil under static or cyclic actions, such as self-weight, wind, or earthquake, is of major significance. The consequences of such forces on the structure itself as well as the soil must be taken into consideration. The interaction between the soil and the structure constructed on it is extremely important. The paper presents the response of a stiff block subjected to cyclic horizontal load such as earthquake. The solid aluminium block 6 cm wide and height to width ratio (H/B) of 4.5 has been subjected to horizontal excitation using a shaking table. The block was placed on the sand (D = 0 cm) or embedded in the sand (D = 2 cm). A sinusoidal displacement function with varying amplitude and frequency was used for the horizontal excitation. The amplitude ranged from 0.5 to 5 cm, while the frequency ranged from 0.5 to 3 Hz. The critical amplitude and frequency combination for a certain height to weight ratio was found using combinations of different frequencies and amplitudes. This information was later used for further investigation and numerical verification. A stiff block's displacement as well as the displacement of the sand beneath it were monitored using the ARAMIS contactless measuring system. The results obtained from this DIC approach were later used to compare the results of numerical analysis.

5th European Conference on Physical Modelling in Geotechnics (ECPMG2024)

Scaling principles and fundamentals