Avoiding Disproportionate Collapse

Full Session with Abstracts

339923-2 - Nonlinear Dynamic Impact Analysis of Collapsed Debris Using Applied Element Method

Friday, April 20
9:30 AM - 10:30 AM
Location: 202B

Partial collapse of a structure may extend to become a progressive collapse even if the structure has sufficient redundancy to provide an alternative load path. This may happen if the originally structural components which were undamaged by the original event become damaged by the falling debris from the collapse. The new Disproportionate Collapse Standard being developed by ASCE may allow for partial collapse of a structure.

This paper presents a methodology for modeling the impact of the debris loading using the Applied Element Method (AEM). Using AEM, nonlinear dynamic 3D analysis can be performed taking into consideration separation of structural components. Furthermore, the technique automatically detects contact and impact between the separated structural components and the rest of the structure.

A case study of a three-story reinforced concrete structure that was demolished as part of a collaborative research on collapse modeling and disaster response is presented. The structure is surveyed to create as-built drawings and gather sufficient information about the reinforcement steel and concrete. Subsequently, the structure is weakened in systematic technique to invoke partial collapse of the second and third floors and impact of the falling debris with the first floor slab. The AEM model of the structure including slabs, girders, and columns is subjected to the same weakening details to induce the same mode of partial collapse. The observed impact of the debris on the first floor in the model of the structure is found to be a good match with the observed damage in the real life case.

Ahmed Khalil

Structural Consultant
Applied Science International

Twenty years of experience in structural analysis and design and managing research teams providing blast analysis, structural vulnerability assessment, and demolition analysis based on advanced nonlinear dynamic analysis. Distinguished published research in the areas of use of advanced fiber-composites for seismic retrofit of structures, progressive collapse analysis, applied element analysis, demolition analysis, blast analysis, nonlinear finite element analysis, and experimental testing of reinforced concrete structures.


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339923-2 - Nonlinear Dynamic Impact Analysis of Collapsed Debris Using Applied Element Method

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