23 May Updating and Documenting Single-Degree-of-Freedom Response Limits for Anti-Terrorism Design
K&C presented this paper on Updating and Documenting Single-Degree-of-Freedom Response Limits for Anti-Terrorism Design at the ICPS6 conference in Auburn, Alabama in May 2023.
Eric Kjosling – Karagozian & Case, Inc.
Mark Weaver – Karagozian & Case, Inc.
Charles Oswald – AG&E Structural Engenuity
John Geringer – Protective Design Center
A primary method used by the Department of Defense (DoD) to design structures to resist the effects of
blast loading from terrorist explosive threats is the single-degree-of-freedom (SDOF) analysis. Various tools that employ SDOF analysis (e.g., Single-Degree-of-Freedom Blast Design Spreadsheet (SBEDS), Column Blast Analysis and Retrofit Design (CBARD)) are currently used to design DoD infrastructure for blast loading. PDC-TR 06-08 (‘Single Degree of Freedom Structural Response Limits for Antiterrorism Design’) documents response limits that are used to determine the Level of Protection (LOP) provided by blast loaded components based on results from SDOF analysis. Since the publication of the current version of PDC-TR 06-08 (revision 1, published 2008), additional blast testing efforts have been performed that further inform the response limits included in PDC-TR 06-08. An effort to update PDC-TR 06-08 is currently underway. Two objectives of this revision are to (A) document the pretext for the response limits defined in PDC-TR 06-08 based on test data (where possible) and sound engineering judgment (where blast test data is limited or not available) and (B) update proposed response limits, as appropriate, based on recent blast testing efforts. The current revision effort is focused on concrete and wood materials, as well as the effects of combined loading (i.e., flexure and compression) on component response. This paper summarizes some of the literature reviewed so far as part of the revision. Relevant shock tube and high explosive arena tests are identified and discussed. Sample SDOF calculations are also presented and compared to physical test results to facilitate identification of appropriate response limits. The collation of literature and recent test data presented in this paper is intended to provide needed context for SDOF response limits. This paper will be useful for practicing protective design engineers, researchers investigating the blast response of protective elements, and officials responsible for setting performance requirements within published standards.