Reliability-Based Specification of Design Load-Effect for Penetrating Fragments and Debris

by R. H. Sues, Applied Research Associates, Inc, Raleigh, United States,
L. A. Twisdale, Applied Research Associates, Inc, Raleigh, United States,

Document Type: Proceeding Paper

Part of: Probabilistic Mechanics and Structural and Geotechnical Reliability


This paper presents the derivation and application of a simplified reliability-based approach for selecting design fragments/debris particles for use in protective design. Using this approach, the designer selects the characteristics of the design particle from a table as a function of the desired desired reliability level. The design methodology is based on a lethality transformation and the Hypergeometric function. The methodology incorporates the uncertainty distributions of the variables that describe the fragment/debris population and the expected number of fragment/debris hits on the structure. The paper presents a design example and compares design results for the reliability-based approach and the traditional approach. The traditional approach does not produce risk consistent designs and can be either overly conservative or unconservative.

Subject Headings: Structural design | Structural reliability | Particle size distribution | Load factors | Probability | Particles | Debris

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