Prediction of seismic performance levels of corroded reinforced concrete columns as a function of crack width


Yalçıner H., Kumbasaroğlu A., Karimi A.

Advances in Civil Engineering Materials, cilt.8, sa.3, 2019 (Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 8 Sayı: 3
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1520/acem20190035
  • Dergi Adı: Advances in Civil Engineering Materials
  • Derginin Tarandığı İndeksler: Scopus
  • Anahtar Kelimeler: Column, Concrete, Corrosion, Crack width, Cyclic loading, Performance level, Reinforcement bar
  • Erzincan Binali Yıldırım Üniversitesi Adresli: Evet

Özet

© 2019 ASTM International. All rights reserved.An experimental study was conducted for the prediction of the seismic performance levels of corroded reinforced concrete (RC) columns as a function of the initial corrosion crack widths. A full-scale accelerated-corrosion pool was used to corrode 25 full-scale RC columns. The initial crack widths at different levels of corrosion were measured for three different concrete strength levels: 9, 27, and 37 MPa. The seismic performance levels of corroded RC columns under combined cyclic lateral-displacement excursions at two different axial-load ratios (0.20 and 0.40) were measured. The corrosion levels obtained for the initially measured corrosion crack widths were used for establishing a correlation with the lateral-displacement capacities of the RC columns according to an energy-based method. Three empirical models were developed. The first was for predicting the cross-sectional area reduction of reinforcement bars according to the initial corrosion crack widths. The second model was for predicting the percentage of energy capacity of RC columns as a function of the drift ratio and corrosion levels. The third model was for predicting the seismic performance levels of RC columns as a function of the initial corrosion crack widths and was used for an in situ structural assessment. The experimental test results showed that above a 2% drift ratio, all uncorroded RC columns (regardless of the concrete strength levels) exhibited a sudden reduction in energy capacity, and their total energy capacity was consumed. In the case of corrosion, the energy capacity of concrete with high strength levels was prematurely exhausted above a 1.4% drift ratio because of the effects of the corrosion products under the high strength levels of the concrete.