Experiment Mechanical Behaviors Research On Steel Recycled Aggregate Concrete Column After High Temperature

With the characteristic of the reinforced concrete structure and the advantage on recycling of the recycled aggregate, the utilization of reinforced recycled concrete structure which served as a important component of recycled concrete applications achieve the sustainable development of construction, resources and environment. The research on reinforced recycled concrete structure through a high temperature burning provide a reference to fire resistance of recycled concrete research and the detection and evaluation of post disaster. In this paper, through experimental study of reinforced recycled concrete column investigate the mechanical properties of high temperature post.In our research,40 reinforced recycled concrete short columns and 9 reinforced recycled concrete columns under eccentric load were design.40 specimen of it went through the high constant temperature, compared with the rest under the normal situation. The mechanical performances of the total specimen under the static load were investigated.Based on the high temperature test, the feature of specimen and element were acquired; Analysis of the change features such as ignition loss rate and the apparent condition.From this research, the failure mode of the specimen under the static load test were observed; parameters of feature point such as peak load and peak displacement were obtained; the graphic for specimen about load-displacement curve and the strain distribution of the deformation zone were drawn. It analyzes the influence of parameters (recycled coarse aggregate replacement ratio, temperature, concrete strength, the highest temperature and stirrup spacing) on the mechanics performance of axial compression short column after high temperature, and analyzes the influence of replacement ratio, temperature and eccentricity ratio on the mechanics performance of eccentric compression column after high temperature. The results show that temperature and concrete strength have a significant effect to mechanical performance of the axial compression short column while the replacement ratio and the holding time have less. It also suggests that temperature and the eccentric ratio of the load do more contribution to the mechanical performance of the eccentric loading column, while the replacement ratio less.Using ABAQUS software to simulate the ultimate temperature filed on section of specimen. Based on the standard formula based on the bearing capacity of reinforced recycled concrete column after high temperature calculation method, firstly, combined with the strength of the material after high temperature change fixed axial compression bearing capacity calculation method of short column; Secondly, in combination with cross section once the limit temperature field, the strength and the cross-section reduced method to calculate the bearing capacity of reinforced concrete column. Both two methods were well identical to the experiment result.