Experimental study on the axial compression load capacity performance of short UHPC columns with high-strength steel pipes
To investigate the axial compression behavior of concrete-filled steel tube short columns filled with ultra-high performance concrete(UHPC)in high-strength steel tubes,22 high-strength steel tube UHPC short columns are designed for an axial compression test,comparison and analysis of the axial com-pression performance of the specimen from the failure mode.The purpose is to explore the difference in the actual bearing capacity of high-strength steel pipe UHPC short columns by changing the diameter-thickness ratio,concrete strength,section type.The test results show that the axial compression performance of high-strength steel tube UHPC short column is greatly influenced by the diameter-thickness ratio and concrete strength;the bearing capacity of the specimen increases with the increase of steel tube wall thickness,but the same steel tube diameter and different steel tube diameter increases show different regularity.This paper innovatively analyzes from two perspectives of ductility and core concrete strength improvement,and puts forward relevant parameter design suggestions for high-strength steel tube concrete specimens.Finally,the results of the axial compression test bearing capacity of the high-strength steel tube UHPC short column are compared with the results of the calculation bearing capacity of domestic and foreign standards GB50936-2014 and AIJ,and the calculation of the axial compression bearing capacity of the high-strength round steel pipe UHPC specimen is derived based on the extremely balance theory.The formula is verified by combining the experimental data in this paper,which proves the accuracy of the formula.
high-strength steel pipeultra-high performance concreteshort column of concrete filled steel pipeultimate bearing capacityexperimental research