Response of a Model Roof Slab to Fragment Impact Loading.
Abstract
Not only must structure perforation by high-speed fragement impact be considered when designing earth-covered fortifications but also the impulsive load imported by these impacts to the structure must be considered. This report describes preliminary tests and analyses conducted to determine a design procedure that will account for these loads. As an initial step, a 1/8th-scale model simply supported, one-way, reinforced-concrete roof slab 3/4 in. thick with a 4.5-in dense sand cover was selected for analysis and testing. Fragments having a mass of 4.41 grams were fired from a gun at velocities from 2000 to 4000 fps, impacting the center of the roof slab. Deflection-versus-time histories were monitored and compared with predictions made using an equivalent single-degree-of-freedom analysis. This analytical technique appeared to be a good means of predicting maximum response; however, more experiments are recommended before an analytical design procedure is developed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1979
- Accession Number
- ADA072926
Entities
People
- Thomas R. Lutman