Static And Dynamic Plate Bearing Tests On Dry Sand Without Overburden
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Static and Dynamic Plate-bearing Tests on Dry Sand Without Overburden
The NCEL atomic blast simulator is intended for testing beams, beam- column connections, and other relatively narrow structural elements. This report describes the successful adaptation of the simulator for providing dynamic loads on a bearing plate on sand and presents some tentative results. The dynamic bearing capacity of a 15-in.-diameter bearing plate on dry sand without overburden was 90% higher than the static bearing capacity. Also, the dynamic bearing modulus was considerably higher than the static; e.g., 226 psi per in. dynamic versus 137.7 psi per in. static at 0.5 in. plate settlement.
Static and Dynamic Plate-bearing Tests on Dry Sand with Overburden
Six static and 53 dynamic soil-bearing tests were made under simulated overburden pressures of zero to 15 psi to determine the load-displacement characteristics of buried footings. The static bearing modulus increased as overburden pressure increased up to an overburden pressure of approximately 6 psi. The dynamic bearing modulus increased exponentially with overburden pressure to an overburden pressure of 15 psi. Up to 3 psi overburden pressure, dynamic modulus was larger than static; but the difference was less at 3 psi overburden than at zero. The relationship between static and dynamic moduli was not firmly established for overburden pressures greater than 3 psi. These tests were made on a 15-inch-diameter bearing plate in dry sand using the NCEL atomic blast simulator. (Author).
Static and Dynamic Bearing Tests on a Strip Footing in Saturated Sand
The report describes the static and dynamic loading of a 12-inch-wide by 18-inch-deep by 6-foot-long rigid footing, representing the strip footing of a subsurface shelter. Boundary conditions simulated those of a torsionally restrained footing of a flexible arch structure with simulated overburden of 20 feet at one side of the footing. Saturated and partially saturated sand was the test soil. Several soil void ratios were employed, and the effect on the relationship between load and displacement of the footing caused by soil saturation at void ratios higher than the critical void ratio was desmonstrated. (Author).