Repair of Reinforced Concrete Columns Using Steel Fiber Mat Reinforced Slurry Concrete
G. C. Brunnhoeffer, M. B. Farrell, N. M. Hawkins,
W. L. Gamble, and F. P. Shkurti
Appears on pages(s):
columns (supports); cyclic loads; ductility; hysteresis; jacketing; slurry
Three reinforced concrete columns with inadequate strength, non-contact, lap splices at their base were tested to failure under reversed cyclic loading. An investigation was then made a method for jacketing such damaged columns in order to reinstate and improve their seismic performance. The damaged columns were jacketed using a steel fiber mat infiltrated with slurry and then again tested to failure under reversed cyclic loading. The degree of restoration and improvement in the seismic performance of the columns was partially dependent on the degree of damage suffered by the column during the initial non-jacketed testing. However, in all cases the jacketed columns exhibited load-deflection hysteretic characteristics equal to, and ductility characteristics exceeding, those of the non-jacketed column. Details are provided of the seismic performance characteristics of the columns, and the repair techniques used.