A Study of the Feasibility of Shock Isolating Very Large Manned Underground Structures

摘要

The feasibility of shock-isolating very large manned underground structures from the intense ground motions generated by a nuclear blast was investigated. The structure under consideration housed personnel living quarters, and communications and survival equipment, including large liquid-filled tanks, and was suspended within a concrete-lined underground cavity. Various suspension configurations, isolators, and damping devices were investigated and their performance characteristics compared with the specific requirements of this facility. It is concluded that an inclined, elastic, pendular suspension system incorporating fluid-filled isolators and force-limited dampers provides satisfactory control over the body motions without exceeding acceptable accelerations. Conventional cage structure and liquid storage techniques are found to be acceptable if careful attention isgiven to their design. (Author)