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논문 기본 정보

자료유형
학술저널
저자정보
Kalogeropoulos, George I. (Department of Civil Engineering, Aristotle University of Thessaloniki) Tsonos, Alexander G. (Department of Civil Engineering, Aristotle University of Thessaloniki)
저널정보
테크노프레스 Structural monitoring and maintenance Structural monitoring and maintenance 제1권 제3호
발행연도
2014.1
수록면
273 - 292 (20page)

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The effectiveness of a retrofitting method for concrete columns with particular weaknesses is experimentally evaluated and presented in this paper. Structural deficiencies namely the inadequacy of transverse reinforcement and short length of lap splices are very common in columns found in structures built prior to the 1960s and 1970s. Recent earthquakes worldwide have caused severe damages and collapses of these structures. Nevertheless, the importance of improving the load transfer capacity between the deficiently lap-spliced bars is usually underestimated during the strengthening procedures applied in old buildings, though critical for the safety of the residents' lives. Thus, the seismic performance of the enhanced columns is frequently overestimated. The retrofitting approach presented herein involves reinforced concrete jacketing of the column sub-assemblages and welding of the lap-spliced bars to prevent the splice failure and conform to the provisions of modern design Codes. The cyclic lateral loading response of poorly confined original column specimens with insufficient lap splices and the seismic behavior of the retrofitted columns are compared. Test results clearly demonstrate that the retrofitting procedure followed is an effective way of significantly improving the seismic performance of substandard columns found in old buildings.

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