Effects of Reinforcement Configuration on Reserve Capacity of Concrete Slabs
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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Fifteen one-way reinforced concrete slabs were statically tested under uniform surface pressure either to failure, or to deflections that exceeded 17 to 24 percent of slab clear span. The main objective was to determine principal reinforcement configurations that would enhance tensile membrane behavior at large deflections. Each slab had a clear span of 24 inches and was 2-516 inches thick. Grade-60 reinforcement and 4,000-psi concrete were used. The total amount of principal reinforcement was about the same in every test, but the percentages of reinforcement in tension and compression zones were varied. The slabs were supported in a reaction structure and restrained at the supports. A modified three-hinged mechanism was formed, and rupture of reinforcement prohibited the development of pure tensile membrane behavior in most of the slabs. Posttest analysis applying tensile membrane theory agreed with the experimental tensile membrane slope, when the area of ruptured reinforcement was deleted. Based on these test results, principal reinforcement details were recommended for a blast shelter roof slab design. Keywords Beam- column action Blast shelters Buried shelters Civil defense Compressive membrane Reinforced concrete Shelters Slab capacity Slabs Tensile membrane.
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