A STUDY OF LAUNCH FACILITY CLOSURES.
Abstract
The study was conducted in order to obtain information necessary for the design of missile silo closures capable of resisting 1,000 psi overpressure resulting from a nuclear detonation. The structures studied were principally thick reinforced concrete slabs which were reinforced with either conventional reinforcing bars or with flat steel plates bonded to the concrete by the use of shear studs. Analytical studies, using lumped mass parameter methods, were conducted. Simply supported circular slabs, slabs which were simply supported but with the lower edge restrained from outward movements, and tapered plugs fitting tapered holes were studied. Designs of a number of prototype slabs were prepared, and seventeen 1/14-th and three 1/5-th scale models of the most promising designs were built and tested to failure. Eleven models designed for a nominal load of 1,000 psi were constructed; ten supported more than 2,100 psi, and all failed in shear. The high load capacities may be attributed to the presence of large in-plane compression forces set up in the slabs because of the friction between the slabs and the supports. A procedure for evaluating the flexural and shear strengths of such very thick slabs if presented, and is satisfactory for determining a lower reasonable bound to the test data. Studies of the triaxial strength properties of concrete and various types of rock were conducted, as was a study of the deformation properties of jointed rock masses. These two studies are directly applicable to the analysis of systems designed for considerably higher overpressures than are considered in this report. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1967
- Accession Number
- AD0824941
Entities
People
- Alfred J. Hendron Jr.
- Johann H. Rainer
- William C. Schnobrich
- William L. Gamble
Organizations
- University of Illinois Urbana–Champaign