Abstract
A considerable amount of existing reinforced concrete (RC) buildings in developing countries possess vital deficiencies such as incorporating poor quality of concrete and insufficient transverse reinforcement, and use of plain reinforcing bars without proper detailing, such as inadequate configurations of lap-splices at critical plastic hinging zones. While these can affect the strength and ductility of structural members adversely under seismic actions, research on such substandard structural members is scarce. As such, further information is valuable for the assessment of the seismic safety of such substandard columns constructed with inadequate lap-splice configurations of plain round bars. Therefore, this study aims to investigate the effects of different lap-splice configurations of plain bars on the seismic performance of substandard RC columns and contribute to the development of assessment codes for such existing substandard buildings. Towards this aim, three full-scale columns were constructed to represent typical characteristics of substandard RC columns. The columns were subjected to constant axial loading (with an axial load to capacity ratio of 0.3) and reversed cyclic displacement reversals simultaneously representing gravity loads and seismic actions, respectively. The test program included i) one reference column with continuous longitudinal bars (no lap-spliced connection), ii) one lap-spliced column with an overlap length of 20 times the longitudinal bar diameter without any hook and iii) one lap-spliced column with an overlap length of 20 times the longitudinal bar diameter with a 180-degree hook. Test results demonstrated that columns with lap-splices did not reach their flexural strength and experienced more remarkable strength degradation with respect to the column reinforced with continuous longitudinal bars. On the other hand, presence of a 180-degree hook at the ends of spliced bars reduced the negative influence of inadequate lap-splice length in terms of strength and ductility.
Original language | English |
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Title of host publication | Proceedings for the 6th fib International Congress, 2022- Concrete Innovation for Sustainability |
Editors | Stine Stokkeland, Henny Cathrine Braarud |
Publisher | fib. The International Federation for Structural Concrete |
Pages | 1573-1582 |
Number of pages | 10 |
ISBN (Print) | 9782940643158 |
Publication status | Published - 2022 |
Event | 6th fib International Congress on Concrete Innovation for Sustainability, 2022 - Oslo, Norway Duration: 12 Jun 2022 → 16 Jun 2022 |
Publication series
Name | fib Symposium |
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ISSN (Print) | 2617-4820 |
Conference
Conference | 6th fib International Congress on Concrete Innovation for Sustainability, 2022 |
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Country/Territory | Norway |
City | Oslo |
Period | 12/06/22 → 16/06/22 |
Bibliographical note
Publisher Copyright:© Fédération Internationale du Béton – International Federation for Structural Concrete.
Funding
This study is supported by The Scientific and Technological Research Council of Turkey (TUBITAK) under the Grant No. 119M623. The contributions of Muhsin Can Luleci, Bilal Sari and Erkan Tore are gratefully acknowledged. The authors are also thankful to the support of Fibrobeton Yapi Elemanlari Co and Mr. Muhammed Marasli.
Funders | Funder number |
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Türkiye Bilimsel ve Teknolojik Araştırma Kurumu | 119M623 |
Keywords
- Column
- Lap-splice
- Reinforced Concrete
- Seismic
- Substandard