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|Title:||Effects of edge restraint on slab behavior|
|Authors:||Keyworker Blast Shelter Program.|
United States. Federal Emergency Management Agency.
Guice, Leslie K.
|Keywords:||Nuclear blast shelters|
Atomic 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-86-2.|
Abstract: This study was performed in conjunction with a Federal Emergency Management Agency program to plan, design, and construct keyworker blast shelters which would be used in high-risk areas of the country during and after a nuclear attack. The shelters considered in this study were box-type structures in which damage is much more likely to occur in the roof slab than in the walls or floor. In this part of the program, the effect of edge restraint on slab behavior was investigated. The primary objective was to determine the effects of partial rotational restraint on slab strength, ductility, and mechanism of failure. Sixteen one-way, reinforced concrete plate elements were tested in a reaction structure under uniform static water pressure. A "thick-slab" group consisted of eight slabs with span-thickness ratios of 10.4, while eight slabs in the ''thin-slab'' group had span-thickness ratios of 14.8. The following conclusions were reached at the completion of testing: (1.) Thrusts enhanced the flexural capacities of slabs with small rotational freedoms as long as the lateral stiffness was sufficient to develop in-plane forces. (2.) The deflections at which the peak capacities were achieved were significantly different for slabs with varied rotational freedoms. (3.) For larger rotational freedoms, the peak capacities occurred at large deflections, were significantly lower than the capacities which were predicted by compressive membrane theory, and in some cases, the slabs had no definitive flexural capacity at all. (4.) Smaller rotational freedoms were necessary to induce a stability failure in the thin slabs. (5.) Significantly more tensile membrane response occurred in the thin-slab group than in the thick-slab group. (6.) In those slabs which were reinforced with ductile No. 2 bars, average incipient collapse deflection occurred at approximately one-eighth of the span for the thick-slab group and somewhat more than that for the thin-slab group. NOTE: This file is large. Allow your browser several minutes to open the file.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Technical Report|