Research On Seismic And Refractory Properties Ultra Of Early Strength Fiber Reinforced Concrete Columns

Super-early-strength of fiber concrete material with its energy-intensive, refractory, good properties such as high bond stress, micro expansion in reinforced concrete structures in recent years are seriously, is convenient in construction process with smaller effect, is widely used in the reinforcement application, due to the super early strength fiber concrete material starts late, many aspects which are not mature enough need to be studied further.Multiple disasters have obvious damage on the shear properties of reinforced concrete column easily, even make the column shear failure, reinforced concrete structure under multiple disasters after injury will produce a sharp fall in the mechanical properties of material, which cause the overall structural safety performance. Due to the current domestic of multiple disasters residual shear bearing capacity of reinforced concrete column performance research is relatively small, for multiple disasters in the earthquake zone of reinforced concrete structure damage evaluation and reinforcement repair advice is undoubtedly the most important. Based on reinforced concrete column as the research object, this paper expand this shear and seismic performance of systems research from the material test, structure test, damage analysis three aspects. In this paper, main work is as follows:(1)The four groups with different mixing proportion of super early strength after high temperature fire fiber concrete cube specimens experiment is tested, which investigate the influence of the carbon fiber content, coarse aggregate, dosage of polypropylene fiber, aluminates cement and ordinary Portland cement quality than factors such as the influence of the compressive bearing capacity of the specimens under different temperature conditions. Experimental results show that:1) Compression bearing capacity of the specimens after high temperature increase gradually, when the specimen at 200℃,400℃,600℃,800℃ after peak load compared with the normal temperature fell 9.8%,28.2%,42.2% and 28.2% respectively; 2) the color depth increases with temperature rise gradually, with the rise of temperature, time of color change from by grey, into a dark red, and finally into grey; 3) the crack width and depth increased with the rise of temperature.(2)The six pillar of super early strength fiber reinforced concrete materials and two super early strength fiber concrete material of C30 concrete columns reinforced are in seismic experiment, inspected the axial compression ratio, coarse aggregate, carbon fiber content on the shear capacity of reinforced concrete columns, the influence of the hysteretic energy dissipation capacity and ductility. The experimental results show that:1) the axial compression ratio is an important index of shear bearing capacity of reinforced concrete column.2) fiber content within a certain range play a catalytic role to increase shear bearing capacity.(3)The 4 pillar of super early strength fiber reinforced concrete materials,5 root super early strength fiber C30 concrete columns and 1 reinforced concrete material pillar of C30 concrete are in multiple seismic performance test after the disaster, investigate the influence of the hysteretic energy dissipation capacity and ductility with different temperature and time on the shear capacity of reinforced concrete columns,. The experimental results show that:1) the crack width and quantity increases with temperature exaltation gradually; 2) the specimen surface color depth decreased gradually with the heating time.