Accession Number : AD0434222


Title :   MODEL STUDIES OF LARGE VENTED OPENINGS - PHASE 1


Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA


Personal Author(s) : Teague, Donald S , Jr


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/434222.pdf


Report Date : 05 Mar 1964


Pagination or Media Count : 73


Abstract : To determine the optimum configuration of pits for protecting generators from blast loading, tests were conducted using the NCEL Twelve-Inch Shock Tube. The effects of overpressure and dynamic pressure were considered separately. Overpressure was measured quantitatively by a pressure cell mounted in the bottom of the model pit; dynamic pressure was measured qualitatively by observing the bending of 3-or-4-in. lengths of 1/16-in. solder. For the overpressure tests, the model pit was mounted inside the shock tube. For the dynamic pressure tests, the model pit was mounted outside, at the outlet of the shock tube. Various parapets and covers (including gratings and special structures) were installed around or over the pit. No parapets or covers were found that appreciably reduce the overpressure in the pit, but all reduce the dynamic pressure to some extent. The parapets make the least reduction, and the gratings the most. Special structures, such as louvres, reduce dynamic pressure by various amounts according to their design, but simplicity and effectiveness make the use of gratings appear more promising.


Descriptors :   *SHELTERS , *BLAST , *VENTILATION DUCTS , SHIELDING , GENERATORS , SHOCK TUBES , PROTECTIVE COVERINGS


Subject Categories : Structural Engineering and Building Technology
      Civil Defense


Distribution Statement : APPROVED FOR PUBLIC RELEASE