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Investigation of the Suitability of Prepakt Concrete for Mass and Reinforced Concrete Structures

Description: The purpose of the investigation reported herein was to develop data on the suitability of Prepakt concrete for mass concrete dams and for reinforced concrete construction. Prepakt concrete is made by packing the forms with coarse aggregate and then pumping in a cement base intrusion mixture (grout) to fill the voids.
Date: October 1951
Creator: Waterways Experiment Station (U.S.)
Partner: UNT Libraries Government Documents Department

Short- and Long-Time Deflections of Reinforced Concrete Flat Slabs

Description: Summary: "This report summarizes the results of a field investigation to determine the short- and long-time deflections and concrete strains in an Army barracks flat-plate structure at Fort Hood, Killeen, Texas. Due to the rather great slab thickness of 9 in., corresponding to an L/T ratio of approximately 28, all observed deflections were small and in no instance exceeded 0.022 ft, or about 1/800 of the shorter span, during the 45-month observation period, in spite of an early temporary construction load estimated to have been almost 30 percent in excess of the total design load. The measured short-time deflections under various loading conditions compared reasonably well with deflections predicted by use of the ersatz frame analysis method" (p. ix).
Date: February 1970
Creator: Geymayer, H. G. & McDonald, J. E.
Partner: UNT Libraries Government Documents Department

Investigation of Construction Failure of Harbour Cay Condominium in Cocoa Beach, Florida

Description: Report issued by the National Bureau of Standards over investigations of construction failure in Cocoa Beach, Florida. Factors for the construction failure are discussed. This report includes tables, illustrations, and photographs.
Date: August 1982
Creator: Lew, H. S.; Carino, N. J.; Fattal, S. G. & Batts, M. E.
Partner: UNT Libraries Government Documents Department

Investigation of Construction Failure of Reinforced Concrete Cooling Tower at Willow Island, West Virginia

Description: Report issued by the National Bureau of Standards over investigation of the collapse of a concrete cooling tower on Willow Island, West Virginia. Results of field, and laboratory tests are discussed. This report includes tables, illustrations, and photographs.
Date: September 1982
Creator: Lew, H. S.; Fattal, S. G.; Shaver, J. R.; Reinhold, T. A. & Hunt, B. J.
Partner: UNT Libraries Government Documents Department

Modeling coupled blast/structure interaction with Zapotec, benchmark calculations for the Conventional Weapon Effects Backfill (CONWEB) tests.

Description: Modeling the response of buried reinforced concrete structures subjected to close-in detonations of conventional high explosives poses a challenge for a number of reasons. Foremost, there is the potential for coupled interaction between the blast and structure. Coupling enters the problem whenever the structure deformation affects the stress state in the neighboring soil, which in turn, affects the loading on the structure. Additional challenges for numerical modeling include handling disparate degrees of material deformation encountered in the structure and surrounding soil, modeling the structure details (e.g., modeling the concrete with embedded reinforcement, jointed connections, etc.), providing adequate mesh resolution, and characterizing the soil response under blast loading. There are numerous numerical approaches for modeling this class of problem (e.g., coupled finite element/smooth particle hydrodynamics, arbitrary Lagrange-Eulerian methods, etc.). The focus of this work will be the use of a coupled Euler-Lagrange (CEL) solution approach. In particular, the development and application of a CEL capability within the Zapotec code is described. Zapotec links two production codes, CTH and Pronto3D. CTH, an Eulerian shock physics code, performs the Eulerian portion of the calculation, while Pronto3D, an explicit finite element code, performs the Lagrangian portion. The two codes are run concurrently with the appropriate portions of a problem solved on their respective computational domains. Zapotec handles the coupling between the two domains. The application of the CEL methodology within Zapotec for modeling coupled blast/structure interaction will be investigated by a series of benchmark calculations. These benchmarks rely on data from the Conventional Weapons Effects Backfill (CONWEB) test series. In these tests, a 15.4-lb pipe-encased C-4 charge was detonated in soil at a 5-foot standoff from a buried test structure. The test structure was composed of a reinforced concrete slab bolted to a reaction structure. Both the slab thickness and soil media were varied ...
Date: September 1, 2004
Creator: Bessette, Gregory Carl
Partner: UNT Libraries Government Documents Department