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oai:ebyu-rdlopen.rawdatalibrary.net:ebyu/136172026-10-18T20:33:58Zopenairedrivercom_ebyu_10000col_ebyu_10001

Prediction of seismic performance levels of corroded reinforced concrete columns as a function of crack widthYalciner, HakanKumbasaroglu, AtilaKarimi, AqludinColumnConcreteCorrosionCrack widthCyclic loadingPerformance levelReinforcement barColumns (structural)Concrete productsConcretesCyclic loadsForecastingReinforced concreteSeismic wavesSeismologyAccelerated corrosionCross sectional areaLateral displacementsReinforced concrete columnStructural assessmentsAn 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. © 2019 ASTM International. All rights reserved.ASTM International2019Articlehttps://rdlopen.rawdatalibrary.net/r/ebyu/13617https://doi.org/10.1520/acem201900352379-1357enAdvances in Civil Engineering Materialsinfo:eu-repo/semantics/openAccessinfo:eu-repo/semantics/articlehttps://ebyu-rdlopen.rawdatalibrary.net/tr/items/ebyu/13617