1. PURPOSE AND OBJECTIVE.
The purpose and objective of this manual is as
a. Purpose. This manual, which is a new one in the structural
engineering design series, is to provide design guidance for structures of
various types to resist blast loadings. Information in this manual is the
result of extensive literature and data search, supplemented by some
original studies on various aspects of blast design. Existing design
criteria are reviewed, consolidated and simplified where appropriate.
b. Objective. This manual is supplementary to NAVFAC P-397, Structures
to Resist the Effects of Accidental Explosions of June 1969, and is intended
to assist engineers in the preparation of design using established criteria.
NAVFAC P-397 is currently being revised. In the event of any contradiction
between the new P-397 and this manual, the new edition of P-397 will govern.
The topics covered in this manual include:
1. Clarification of the differences between static and dynamic
loadings, and between short and long duration dynamic loads.
2. Various effects associated with a chemical (HE) explosion
including blast overpressures, fragments from casing and secondary fragments
associated with the break-up of a donor structure.
Design of reinforced concrete beams and columns.
Design of structural steel elements to withstand blast loads.
5. Design of blast resistant elements using materials other than
cast-in-place reinforced concrete and structural steel. Such materials
include reinforced concrete masonry, brick, glass, and similar transparent
Design and analysis procedures for blast doors.
7. Design and analysis of foundations including the dynamic
increase factor for soil strength.
8. Description of available programs used in the design of blast
b. General Theory and Principles. Wherever warranted, general theory
and principles are provided. It should be emphasized that the manual is not
intended to develop new material beyond the present "state-of-the-art", but
rather to consolidate and simplify existing criteria in NAVFAC P-397, and
also to "bring together" the various sources of design criteria which
cover the structures encountered in blast resistant design.