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Earthquakes and Structures Volume 17, Number 3, September 2019 , pages 297-306 DOI: https://doi.org/10.12989/eas.2019.17.3.297 |
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Seismic behaviour of RC columns with welded rebars or mechanical splices of reinforcement |
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George I. Kalogeropoulos, Alexander-Dimitrios G. Tsonos and Dimitrios Konstantinidis
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| Abstract | ||
| The extension of existing RC buildings is a challenging process, which requires efficient connection between existing and new materials to guarantee load transferring between the lap-spliced longitudinal columns\' reinforcement. Therefore, the length of the columns\' starter bars is a crucial factor, which decisively affects the seismic response of the new columns. In particular, when the length of the starter bars is short, then the length of the lap splices of reinforcement is inadequate to ensure load transfer between steel bars and concrete, with an indisputable detrimental impact on the seismic behaviour of the columns. Moreover, in most of the existing RC buildings the column starter bars are of particularly short length, while they have probably been bent, cut or corroded. In the present study, the effectiveness of both welded rebar and mechanical splices of reinforcement in ensuring load transferring between the starter bars and the longitudinal reinforcement of the new column was experimentally evaluated. Four cantilever column subassemblages were constructed and subjected to earthquaketype loading. Three of the specimens were used to examine different types of shielded metal arc welding (SMAW), while in the fourth subassemblage mechanical splices were tested. The hysteretic response of the columns was evaluated and compared to the behaviour of a fifth specimen with continuous reinforcement, tested by Kalogeropoulos and Tsonos (2019). Test results clearly demonstrated that the examined types of SMAW were equally satisfactory in ensuring the ductile seismic performance of the columns, while the mechanical splices found to be more susceptible to exhibit slipping of the bars. | ||
| Key Words | ||
| RC columns; rebar; welding; mechanical splices of reinforcement | ||
| Address | ||
| George I. Kalogeropoulos, Alexander-Dimitrios G. Tsonos: Department of Civil Engineering, Aristotle University of Thessaloniki, GR-54-124 Thessaloniki, Greece Dimitrios Konstantinidis: Department of Civil Engineering T.E., Alexander Technological Educational Institute of Thessaloniki, GR-57-400, Greece | ||