Evaluation of Sliding Displacement of Retaining Structure and Soil Slope regarding the Natural Frequency

Abstract eng:
This paper aims to show the significance of vibration properties in the evaluation of the sliding displacement of the structures such as retaining wall and soil slope. For the update of earthquake resistant design regarding the post-earthquake performance of structures, the evaluation of the sliding displacement during earthquake is important. In the seismic coefficient method widely used in earthquake resistant designs for various types of structures, only the margin for the failure of structure, but not the degree of damage or the deformation to performance of the structures is taken into consideration. The rigid mass-slider model originally proposed by Newmark is sometimes employed for the purpose, which makes it possible to calculate the sliding displacement of rigid mass on the frictional floor. In the framework of this method, the structure is modeled as a rigid mass and its natural frequency is disregarded. In the reality, however, the sliding displacement depends on the flexibility and natural frequency of structure. The evaluation method we introduce in this study employs a mathematical vibration-sliding model which consists of the mass, spring with dashpot, and slider to take account of the vibration properties of structure. A series of shaking table tests on a physical vibration-sliding model were conducted to verify the evaluation method. A good agreement was found between the sliding behaviors observed with the physical model and those calculated with the mathematical model.

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