Study on the axial compression performance and degradation law of steel reinforced concrete short columns after sulfate corrosion
To study the degradation law on the axial compressive properties of steel reinforced concrete short columns under the sulfate attack environment,the compressive performance test of concrete specimens and axial compressive performance test of short column specimens of steel reinforced concrete were carried out after corrosion.The axial compression damage characteristics of short column specimens were observed through the tests,and the performance indexes of bearing capacity and ductility of short column specimens were obtained.The results show that the overall failure mode of short column specimens is basically the same as under the axial compressive loads.The profile steel,longitudinal bars,and stirrups yield one after another,which leads to the severe peeling of concrete and the failure to specimens finally.The bearing capacity and ductility of short column specimens increase firstly and then decrease with the increase of the erosion age or the concentration of sodium sulfate solution.At the erosion age of 120 days,the bearing capacity and ductility of short columns increase 14.90％and 21.44％respectively.When the solution concentration reaches to 10％,the maximum reduction in bearing capacity and ductility of the short column is achieved,which are reduced by 8.04％and 10.72％,respectively.Therefore,the long-term immersion in the high concentration sodium sulfate solution has a great adverse effect on the axial compression performance of specimens.Based on the experimental study in this paper and the existing standard formulas,a modified calculation model on the axial compressive capacity of steel reinforced concrete short columns under the influence of different erosion ages and the sodium sulfate solution concentration is established,and the applicability of the model to this type of member in this environment is verified.
万方数据
维普
