Order number page 26 tn 1QFRICIAEGSE ONLY 940406-171827- set 5 wi -O001- 1 40-KT and 20-MT weapons required to collapse (a) selected, underground, reinforced-concrete farch structures of fixed and two-hinged end conditions, (b) 801. KEYWORD(S) the buried, and concrete-arch structures of PLUMBBOB Project 3.1. The Equivalent Surcharge method, which assumes failure at the threshold of the compression regime, appeared to be the most suitable for the design of structures located above the ground-water table regardless of the direction of the blast front. For structures located below the ground-water table, the Uniform Compression Mode was the most suitable. A method of predicting radiation transmission for use in the design of buried structures is given. Procedures and sample calculations for the design of footings, floor slabs, and end walls are presented in Appendix A. Sample calculations for the response of a specific arch under each of the loading methods are presented in Appendix B. Appendix C presents results of a study to establish the ductility factor at the threshold of the compression regime. 13 references. HARDTACK/;PLUMBBOB/;UNDERGROUND STRUCTURES/blast loading ;UNDERGROUND STRUCTURES/design ;REINFORCED CONCRETE/blast loading ;HARDTACK; PLUMBBOB; PRESSURE TESTING; DESIGN; CALCULATIONS Item 45 150. 110. REPORT NUMBER PRIMARY TITLE (M) 70. 710. PERSONAL AUTHOR( M) CORPORATE SOURCE (USA) PUB. DATE (YYMMDD ) CLASSIF. LEVEL T EXT ABSTRACT 371. 34. 950. NRDL-TR--152 Investigation and correlation of some physical parameters of fall-out material Williamson, Jr. San Francisco, KEYWORD (S) and density. What little correlation that was possible among accumulated data is presented together with residual error. FALLOUT/physical properties ;REDWING/fallout ;TEWA BURST/fallout ;ZUNI BURST/fallout ;FALLOUT; COLOR; PARTICLE SIZE;WEIGHT; DENSITY; SHAPE; REDWING Item 46 150. 110. 710. CA 570328 Unclassified An attempt has been made to correlate some of the fundamental physical parameters of fall-out material. Parameters discussed are color and shape, activity, size, weight, 801. W. Naval Radiological Defense Lab., REPORT NUMBER PRIMARY TITLE (M) CORPORATE SOURCE DASA--1970 High altitude tests measurement summary General Electric Co., Santa Barbara, 003499 OFFICIAL USE ONLY CA (USA).