Cyclic Behavior of Slender R/C Columns with Insufficient Lap Splice Length

Abstract eng:
Performance of slender reinforced concrete columns with insufficient splice length and widely spaced transverse bars has been discussed in this paper. Reinforced concrete columns which constructed according to ACI (pre-1971) provisions often have common deficiencies associated with inadequate detailing of the reinforcing steel. One such deficiency is the detailing of lap splices at the base of columns, which are often short and poorly confined as a result of widely spaced ties with 90-degree hooks, and located immediately above the floor or foundation where large inelastic demands can be expected. Poor splice behavior has been observed in recent earthquakes, may have significant role in partial or total collapse of buildings. Although there are many modern codes that offer detailing for high prone seismic regions, due to poor implementation such defective detailing is constructed in some developing countries such as Iran. Four half-scale columns representing exterior columns were constructed and tested under reversed cyclic lateral deformation with either constant axial load. Three specimens conformed to ACI (pre-1971) and a specimen was built according to ACI (318-02). Specimens consisted of cantilever columns with strong stubs. Parameters which covered in this study include axial load, widely spaced transverse bars, and lap splice length. In conclusion, seismic behavior of the columns in term of the hysteretic response was presented and compared with various evaluation methods. Moreover, results of experimental tests were compared with a numerical study. In general, the common mode of failure for the specimens was a brittle failure owing to bond deterioration of the lap-spliced longitudinal reinforcements.

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