Title:
FORMING A PREDICTABLE FLEXURAL MECHANISM IN REINFORCED WALL ELEMENTS
Author(s):
Patrick Trasborg, Joseph Nickerson, Clay Naito, Pierluigi Olmati, and James Davidson
Publication:
Structural Journal
Volume:
111
Issue:
6
Appears on pages(s):
1481-1490
Keywords:
debonding; mechanical bond; precast concrete; reinforced concrete; reinforcement; ultimate load; wall
DOI:
10.14359/51687165
Date:
11/1/2014
Abstract:
Precast concrete exterior cladding elements designed to be
under-reinforced results in yielding of the reinforcing steel when subjected to out-of-plane demands. Ultimate failure of the panel, however, is often controlled by compression failure of the concrete. In extreme circumstances where the ultimate obtainable deflection is of paramount importance to dissipate energy, such as in a blast event, the global ductility of the panel may be limited by the failure of the compression zone. To improve the performance of thin concrete elements subject to extreme loading scenarios, a failure mechanism that is both ductile and predictable must be developed. In this paper, two different flexural mechanisms have been examined: 1) a deformable steel inlay mechanism on the tensile face of the panel; and 2) locally debonding the flexural reinforcement
in the hinge region. Each flexural mechanism investigated
successfully increases the global ductility of the concrete panel in a predictable manner.