Experimental study and prediction on the seismic performance of single bridge column with high strength, flowability, strain hardening steel fiber-reinforced concrete

This paper presents the feasibility study of bridge column using high strength, flowability, strain hardening steel fiber-reinforced concrete, to investigate the seismic performance, especially for the combination of material, cross section, and reinfocement arrangement, as well as the replacing of reinforcement by steel fiber. Total of five specimens were carried out from cyclical loading tests, including specimen RC10T, NEWRC10T, NEWRC20T, NEWRCSF10, and NEWRCSF20T. The specified compressive strength of concrete, yielding strength of longitudinal and lateral reinforcement is 70, 685, and 785 MPa, respectively. The tensile strength, slender ratio, and volumetric ratio of steel fiber is 2300 MPa, 79, and 1.5%. Experimental results demonstrated given a relative low axial loading, the column either with insufficient lateral confinement or with insufficient shear capacity could be recovered by supplemental steel fibers, providing flexural-failure mechanism and achieving drift ratio of 10%. In addition, this seismic performance has been verified with good accuracy by the proposed concept of equivalent lateral reinforcement by using TEASPA.