Behavior of Plate on Elastic Foundation under Impact Load

Abstract. In this study, nonlinear three-dimensional finite element analysis has been used to conduct a numerical investigation of the effect of applied impact load on the foundation based on sandy soil using the finite element method by ANSYS (Version 11) computer program. The 8-node brick elements are used to model the concrete of foundation and the soil under the foundation which are denoted by Solid 65 for concrete and Solid 45 for the soil while the interface is modeled by using three-dimensional surface-to-surface (Target 170 and Contact 174) contact elements connected with concrete and soil. As a case study, a square concrete foundation with dimensions of 3×3×0.3 m placed on the foundation soil 15 m deep and 9 m away from the edge of plate is subjected to impact load. A parametric study is carried out to investigate the effect of several parameters including: foundation thickness, load eccentricity and amplitude of impact load. It was concluded that the load eccentricity increases the displacement and decreases the stress at the foundation center. This is attributed to non-uniformly distributed stresses on the loaded area, where the loads are concentrated locally within the loaded area. The presence of damping leads to a considerable decrease in the foundation displacements and stresses. The increase in the damping ratio reduces the vertical displacement of the foundation at the same time at all damping ratios.

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Study on the Dynamic Response of Gravel Soil Low Embankment under a Long‐Time Dynamic Loading Based on Model Test

Liu

Wang

Du³

2021

Advances in Materials Science and Engineering

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The low embankment is an important technique for road development in subgrade engineering due to its small fill height and applicability to the natural landscape in the oasis desert area of Xinjiang, China. A reasonable development of the gravel soil low embankment design requires the study of its dynamic response under a long-time dynamic loading. In the paper, a 1 : 1 full-scale low embankment model was established and tests of 100000 loading cycles with 50 kN peak value were carried out, taking into account three kinds of foundation moisture contents: 18%, 23%, and 28%. The test results show that the dynamic stress in the gravel soil low embankment attenuates nonlinearly with the increase in depth. The dynamic stress at each depth is the smallest for the water content value of 28% in the foundation. The stress attenuation rate is inversely proportional to the loading cycles and directly proportional to the water content of the foundation. The dynamic stress and dynamic strain in the gravel soil low embankment show cumulative effects with an increase of the loading cycles. The rate of stress and strain accumulation is faster for low loading cycles. The strain accumulation effect of each structural layer in the foundation is the largest for the water content value of 28%. The strain accumulation rate at the top layer of the foundation reaches 2.648. Based on the model test results, the dynamic stress calculation model for the gravel soil low embankment under dynamic loading is proposed. The calculation model was experimentally verified. The research results are important for the application of gravel soil low embankment in the oasis desert area of Xinjiang, China.

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Behavior of Plate on Elastic Foundation under Impact Load

Cited by 3 publications

References 14 publications

Stability of Slab on Elastic Foundation

Stability of Slab on Elastic Foundation

Dynamic response of plates on elastic foundation under eccentric impact load

Study on the Dynamic Response of Gravel Soil Low Embankment under a Long‐Time Dynamic Loading Based on Model Test

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