Experimental Investigation On Eccentric Compression Performance On Columns Of Steel Fiber Reinforced Concrete With Recycled Aggregates

To improve the structural application of steel fiber-reinforced concrete with recycled aggregates(SFRC-RA)composited in gradation by large-particle natural coarse aggregates and small-particle recycled coarse aggregates,the large eccentric compression behavior of eight SFRC-RA columns was experimentally investigated in this paper.The main parameters considered were the strength of the SFRC-RA and the volume fraction of the steel fiber.Details about the sectional concrete strain,the longitudinal steel bar strain,the lateral displacement,the cracking load,the crack distribution and crack width,and the ultimate load of the SFRC-RA columns were measured.The test results show that :(1)SFRC-RA columns have a good deformation capacity and the lateral displacement calculation model is simplified based on the current code,calculated results of which are in good agreement with the test results.(2)The ultimate bearing capacity of SFRC-RA columns under large eccentricity compression load can be calculated by using the formula of the current code for designing steel fiber reinforced concrete structures.(3)Formulas were proposed for predicting the cracking resistance.With the steel fiber volume fraction increasing,the average crack spacing and the average crack width are smaller,and the average crack spacing and crack width are in good agreement with the tests.But the maximum cracking width has large discreteness and needs to do further research.(4)The bearing capacity and lateral displacement of SFRC-RA columns under large eccentric compression load are analyzed by using finite element(FE)software(ABAQUS)compared with the tests of this paper.In addition,the FE analysis and prediction of SFRC-RA columns with different eccentricity and length-fineness ratio are carried out by ABAQUS and the results are basically in good agreement.