03 Apr Dr. Eric Kjolsing, SE, PE Presenting at ICPS6

In May 2023 Dr. Eric Kjolsing, SE, PE will be presenting at the 6th International Conference on Protective Structures (ICPS6) at Auburn University. The presentation will focus on recent efforts to identify and update Single-Degree-of-Freedom (SDOF) response limits for antiterrorism design, including a discussion of test programs reviewed so far as part of this work. The full abstract is given below. To request a copy of the conference paper, please email: weaver@kcse.com. For more information on the ICPS6 conference, click here

ICPS6 Paper Title

Updating and Documenting Single-Degree-of-Freedom Response Limits for Antiterrorism Design

AUTHORS

Eric Kjosling, PhD, SE, PE, Karagozian & Case, Inc.

Mark Weaver, SE, PE, Karagozian & Case, Inc.

Charles Oswald, AG&E Structural Engenuity

John Geringer, U.S. Army Corps of Engineers Protective Design Center

ABSTRACT

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.