SIZE EFFECT IN PULLOUT TESTS

The results of tests of the pullout strength of reinforcing bars embedded in concrete are reported. The test specimens are 1.5, 3, and 6-in. cubes with geometrically similar bars. The results are found to be consistent with Bazant's size effect law for the nominal stress at softening failures due to disturbed cracking. Based on the size effect law, an approximate formula predicting pullout strength is develoed.