Strategies For Mitigation Of Progressive
Collapse Of Corner Panels In Reinforced
Concrete Buildings
Author(s)
O. A. Mohamed
Abstract
Studies have shown that loss of exterior columns at any floor level of a framed
structure building results in higher stresses and larger deformations at the
elements of a panel located at the corner of the building and supported by
exterior columns compared to panels supported by interior columns. Beams
supporting interior or exterior panels can be designed to bridge over a failed
column, which may not possible for beams supporting corner panels. As a result,
corner panels of framed reinforced concrete buildings are particularly susceptible
to progressive collapse. Since design of structures to prevent progressive
collapse entirely may not be realistic for most buildings, it is desirable to adopt
selected measures to achieve a desired level of protection. Most building codes
and design guides permit certain damage levels for interior and exterior panels.
For corner panels, permissible damage limits can be met by adjusting the spans
from the corner column to the first exterior columns. When adjusting spans of
beams is not architecturally desirable, a strategy to protect the exterior column
must be adopted. Possible options include 1) designing steel bracing to support
the additional load from a failed column, 2) designing edge panels and supported
beams to cantilever the full length after the loss of column, and 3) stiffening the
columns for code specified pressure levels. The first two options are discussed in
this paper. A case study is presented in this paper to demonstrate these two
options.
Keywords: progressive collapse, reinforced concrete, building codes, lateral
bracing.
Keywords
progressive collapse, reinforced concrete, building codes, lateral
bracing.
Related Book
Other papers in this volume
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