Avoiding Disproportionate Collapse

Full Session with Abstracts

339923-1 - Dynamic Debris Loading in Flat Plate and Steel Framed Buildings

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

Falling debris imparts a dynamic loading on the floor below. A simplified estimation of this loading depends on the amount of kinetic energy transmitted from the upper floor during impact. The kinetic energy of the impacting floor that is transferred to the impacted floor is first theoretically determined for the two extreme impact possibilities, namely fully rigid and fully plastic impact. Estimation of the falling debris loading is carried out for a reinforced concrete flat-plate system and compared to an earlier analysis using a steel framed composite building. For the steel framed building, a plastic impact results in an amount of energy imparted to a lower floor of 25% to 50% of the initial kinetic energy of the falling beam. For a rigid impact this value is between 50% and 70%. The relative impact loads and ability of the impacted floors to arrest the progressive collapse is also analyzed. For both the steel frame and concrete flat plate buildings, the impacted floor is highly unlikely to withstand an impact from the floor above. The analysis of the flat-plate system includes a detailed look at how the dynamic loading can change the strength and ductility of the slab-column connection.

The session is of interest to the entire structural community and applicable to structural faculty, design professionals, and code developers in the area of disproportionate collapse and dynamic effects. The audience will learn how debris loading may be calculated for a flat plate and steel framed structure.

Sarah Orton

Associate Professor
Univerisity of Missouri

Sarah Orton is an Associate Professor at the University of Missouri Columbia. She received her B.S. from the University of Texas at Austin; M.S. from the University of Illinois Urbana Champaign; and Ph.D. from the University of Texas at Austin. She is chair of the Disproportionate Collapse Technical Committee, member of the Disproportionate Collapse Standards Committee, and Retrofit of Structures under Dynamic Loads committee. Her research interests include structural strengthening, extreme events on structures, and innovative materials.

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Aamer Jawdhari

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Bassam Bassam

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David Cormie

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339923-1 - Dynamic Debris Loading in Flat Plate and Steel Framed Buildings



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