Progressive Collapse of Flat Plate Structures


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Title: Progressive Collapse of Flat Plate Structures

Author(s): Neil M. Hawkins and Denis Mitchell

Publication: Journal Proceedings

Volume: 76

Issue: 7

Appears on pages(s): 775-808

Keywords: concrete slabs; collapse; connections; failure; flat concrete plates; punching shear; shear strength; structural analysis.

Date: 7/1/1979

Factors influencing the initiation and propagation of progressive collapse in flat plate structures are examined. The mechanism most likely to trigger such collapses is a punching strength are examined with particular reference ot the influences of rotational demands, edge restraints, age at loading, and one-way as opposed to two-way bending. Progressive collapses propagate because of an inadequate moment transfer capacity at surrounding columns. The factors affecting that capacity are examined and the desirability of continuous bottom reinforcement through the column demonstrated. The merits of our possible defenses against progressive collapse are evaluated; higher live loadings, integral beam stirrup reinforcement, continuous bottom reinforcement, and the provision of a tensile membrane. Recommendations are made for calculations of the strength provided by a tensile membrane and procedures for detailing that membrane.