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Behaviour of high-strength concrete columns under eccentric compression-tied columus

Eksentrik yüklü yüksek dayanımlı beton kolonların davranışı-etriyeli kolonlar

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  1. Tez No: 47267
  2. Yazar: ERDEM CANBAY
  3. Danışmanlar: DOÇ.DR. GÜNEY ÖZCEBE
  4. Tez Türü: Yüksek Lisans
  5. Konular: İnşaat Mühendisliği, Civil Engineering
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 1995
  8. Dil: İngilizce
  9. Üniversite: Orta Doğu Teknik Üniversitesi
  10. Enstitü: Fen Bilimleri Enstitüsü
  11. Ana Bilim Dalı: İnşaat Mühendisliği Ana Bilim Dalı
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 115

Özet

In this study, the behaviour of high strength concrete square columns under eccentric compressive loading was investigated. Within this scope, six high strength concrete column specimens were tested under eccentric compression. The variable parameters were presence of lateral confinement, tie spacing and cross-tie efficiency. Effect of confinement on column strength and column ductility were discussed with the obtained test results. Furthermore, the experimental response was compared with the load-strain, monıent-curvature and interaction diagrams obtained from concrete models used in this study. The results indicate that:-HSC columns slıowed extremely brittle behavior unless confined by transverse reinforcement. -Cross-ties with 90° bend at öne end and 135° at the other end was as effective as the öne with 135° bend at both ends.-A mechanical ratio, (defined as volumetric ratio of lateral reinforcement times yield strength of ties divided by strength of concrete), of 7% couid not achieve any ductility gain. it prevented oniy the explosive type of failure of the concrete column. This column showed a strength enhancement of approximately 15% compared with the unconfined reference specimen. No improvement was observed at the post peak region.-Minimum requirements in TS500 provision for the confining steel was not sufficient for HSC.-The statement in TS500 (12.3.3) might be revised as follows:“tie spacing should be less than ör equal to 12 diameter of longitudinal reinforcement and 200 mm. For specified concrete compressive strengths in excess of 50 MPa, the tie spacing determined above shall be multiplied by 0.75.”-Among three models used in the analytical study, the agreement of the Nagashima concrete model [21] with the experimental observations was satisfactory.-The mechanical ratio was a very important variable. Öne way of increasing this ratio was increasing the yield strength of the lateral reinforcemeut, that could keep the mechanical ratio as high as required with realisable tie spacing. Therefore, with high strength concrete, high strength steel should be used. Keyvvords: High Strength Concrete, Confinement, Eccentric Compressive Load, Strength Enhancement, Ductility Enhancement, Cross-tie Efficiency Science Code: iv

Özet (Çeviri)

In this study, the behaviour of high strength concrete square columns under eccentric compressive loading was investigated. Within this scope, six high strength concrete column specimens were tested under eccentric compression. The variable parameters were presence of lateral confinement, tie spacing and cross-tie efficiency. Effect of confinement on column strength and column ductility were discussed with the obtained test results. Furthermore, the experimental response was compared with the load-strain, monıent-curvature and interaction diagrams obtained from concrete models used in this study. The results indicate that:-HSC columns slıowed extremely brittle behavior unless confined by transverse reinforcement.-Cross-ties with 90° bend at öne end and 135° at the other end was as effective as the öne with 135° bend at both ends.-A mechanical ratio, (defined as volumetric ratio of lateral reinforcement times yield strength of ties divided by strength of concrete), of 7% couid not achieve any ductility gain. it prevented oniy the explosive type of failure of the concrete column. This column showed a strength enhancement of approximately 15% compared with the unconfined reference specimen. No improvement was observed at the post peak region.-Minimum requirements in TS500 provision for the confining steel was not sufficient for HSC.-The statement in TS500 (12.3.3) might be revised as follows:“tie spacing should be less than ör equal to 12 diameter of longitudinal reinforcement and 200 mm. For specified concrete compressive strengths in excess of 50 MPa, the tie spacing determined above shall be multiplied by 0.75.”-Among three models used in the analytical study, the agreement of the Nagashima concrete model [21] with the experimental observations was satisfactory.-The mechanical ratio was a very important variable. Öne way of increasing this ratio was increasing the yield strength of the lateral reinforcemeut, that could keep the mechanical ratio as high as required with realisable tie spacing. Therefore, with high strength concrete, high strength steel should be used. Keyvvords: High Strength Concrete, Confinement, Eccentric Compressive Load, Strength Enhancement, Ductility Enhancement, Cross-tie Efficiency Science Code: iv

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