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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.

A 40- by 100-foot arch-rib building, prefaf 12-gage-steel ribs and 26-gage galvanized sheeting was erected and subjected to the loading specified in the Uniform Military Requirements Criteria for Prefabricated Advanced Base Buildings. It is concluded that the building meets the minimum requirements of the criteria for Advanced Base Buildings.

An engineering study was made of the effects of Typhoon Karen, which struck the island of Guam on 11 November 1962, with sustained winds estimated up to 173 mph and gusts to 202 mph. The assessments of damage and the recommendations in this report are based on onsite observations in the aftermath of the storm by a team of NCEL engineers, on interviews with public Works Center personnel of Guam, and on reports by other observers. Recommendations, proposed research and development, and suggested new criteria are detailed in this report. (Author)