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Experimental Investigation Of Free Field Conditions In Tanks To Be Used In Interaction Studies, Clark P. Sanger
Experimental Investigation Of Free Field Conditions In Tanks To Be Used In Interaction Studies, Clark P. Sanger
Civil Engineering ETDs
Experiments to determine the effects of boundary friction losses on static and dynamic vertical stress transmission and to determine the stress-strain relationship of standard 20-30 Ottawa sand in 8-inch-I.D. tanks to be used in burial structure interaction studies are presented. In these tests the tank height, boundary condition, sand density, and overpressure rise time were varied. The use of a greased rubber membrane proved to be a reliable method of minimizing the boundary friction losses thus creating a strain field that was independent of the tank height. Vertical stress transmission was not affected by the overpressure load rate. The stress-strain …
The Effects Of Repeated Loading On The Modulus Of Elasticity Of Concrete, Fidel T. Smith
The Effects Of Repeated Loading On The Modulus Of Elasticity Of Concrete, Fidel T. Smith
Civil Engineering ETDs
Under present design methods, the modulus of elasticity is designated only with respect to the ultimate strength and the unit weight of concrete and is assumed constant throughout the life of the structure. The only provision made for change in the modulus of elasticity due to age, moisture content, type of loading or fatigue is to assume the weakest condition of the concrete. On elastic analysis the stress-strain relationship is assumed to be linear and the concrete is assumed to carry no tensile stress. In ultimate design procedures the concept of straight line distribution of stress is dropped and a …