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The Shear Transfer Behavior of Cracked Monolithic Concrete Subject to Cyclically Reversing Shear. Part 3

• ID:

  914

• ESCSI:

  4326.001

• Author:

  Mattock, Alan H.

• Publication Name:

  Report SM 74-4

• Type of Publication:

  Paper

• Publisher:

  NSF Grant No. GK-33842X

• Dated:

  1974

• Issue/Volume:

  November

• Other ID:

• Page(s):

  1-31 + app.A&B

• Reference List:

  Y

• Abstract:

  The total study is concerned with the shear transfer strength of reinforced concrete subject to both single direction and cyclically reversing loading, the latter simulating earthquake conditions. The effect on shear transfer strength of aggregate type and of normal force or moment in the shear plane has also been included.This Part III of the Final Report is concerned with shear transfer across a crack under cyclically reversing load, i.e. simulated seismic loading conditions. Cyclically reversing and monotonic shear transfer tests of companion initially cracked specimens are reported. Both sand and gravel concrete specimens and all lightweight concrete specimens were tested. Tests were made of specimens having initial crack widths of 0.010, 0.015 and 0.025 in.
  It was found that the shear transfer strength under cyclic loading was less than that under monotonic loading, and that it decreased as the initial crack width increased. Under cyclic loading the slip was found to be greater and the separation less than at the same shear under monotonic loading.
  Shear transfer strength under cyclically reversing loading, (such as seismic loading), should for design purpose be taken as 0.8 of the calculated shear transfer strength for monotonic loading.