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|Title:||Effects of reinforcement configuration on reserve capacity of concrete slabs|
|Authors:||Keyworker Blast Shelter Program.|
Woodson, Stanley C.
Garner, Sharon B.
Nuclear bomb shelters
Keyworker blast shelters
|Publisher:||Structures Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; SL-85-5.|
Abstract: 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 2-5/16 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. Post-test 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.
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