DYNAMICALLY LOADED STRIP FOOTING BURIED IN DRY SAND.
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF
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The report describes the dynamic loading of a 12-inchwide by 18-inch-deep by 6-foot-long concrete footing, representing the strip footing of a subsurface shelter. Boundary conditions simulated those of a torsionally restrained footing of a flexible arch structure test-loaded at several different depths of burial. Static overburden pressure was applied only on one side to simulate the footing of an exterior wall. Dynamic loads from 5 to 40 kips per square foot were applied to the footing while the adjacent soil was under simulated overburden pressures of zero to 15 psi. A logarithmic relationship between bearing modulus and overburden is demonstrated for downward displacements of the footing ranging from 0.25 to 1.5 inches. The dynamic secant modulus increased exponentially with static overburden pressure. Author