DESIGN FOR A CAST-IN-PLACE CONCRETE SHELTER

The objective was to develop an economical, arch-shaped shelter, utilizing pneumatically placed mortar, as an alternate to existing standard types. Criteria and plans for a 100-man shotcrete shelter are presented which will provide protection against an overpressure of 100 psi and concomitant effects from nuclear weapons. Shotcrete is recommended because of the economic advantages gained from using a single lightweight form as opposed to the heavy double form required for conventionally placed concrete. Effort was made to provide a balanced and versatile design which may be adapted to the specific needs of various commands. Methods for the design of the basic structural components of the shelter are given, including a method for estimating the relative displacement between the floor and the foundation when the structure is subjected to blast loading. Simple yet adequate design procedures are given which are suitable for use in the design office.