Capturing the Shear Failure of Reinforced Concrete Beams With Snap-Back Instability

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Title: Capturing the Shear Failure of Reinforced Concrete Beams With Snap-Back Instability

Author(s): T. Tanabe and A. ltoh

Publication: Special Publication

Volume: 205

Issue:

Appears on pages(s): 233-250

Keywords: arc length method; energy absorption; post-peak; reinforced concrete; shear failure; snap-back; softening

Date: 1/1/2002

Abstract:
The shear failure of a reinforced concrete beam and a column without stirrups is known to have substantial scale effect. In other words, softening characteristics of concrete play a dominant role in its pre- and post-peak behavior. The post-peak static behavior of reinforced concrete members are directly related to the dynamic post-peak behavior of reinforced concrete structures or the extent of energy absorbing capacity of a member and consequently to the safety margin to be allocated in a beam or a column in seismic design. It become more so when a structure fail in snap-back instability allowing more energy to come in a structure to be converted to dynamic energy passing the peak loading capacity. The numerical difficulty encountered to capture snap-back is itself a good challenging target. The snap-back instability is explained for the case of uniaxial tension, and the shear characteristics of reinforced concrete beams with snap-back are examined by changing the beam dimensions and the span over depth ratio.