ABSTRACT
At present, there are several kinds of fiber composite materials used for reinforced concrete columns in the field of civil engineering which are mainly made of glass fibers, aramid fibers, carbon fibers, and so on[1-3]. In particular, domestic and foreign scholars have carried out my studies on the application of carbon fibers. The study shows that although the bearing capacity of the strengthened members is increased, the ductility of the columns is limited and its brittle failure is because of the failure of the fiber.[4]. Super Reinforcement with Flexibility (SRF) is a new seismic reinforcement technology in Japan after the year 2000. The technology uses High Ductility Polyester Fibers (HDPFs) as the reinforcing material.[5] At present, there is a small number of experimental studies and theoretical analysis overseas,[6-10] but there is no relevant experimental research and theoretical analysis in China.[11-13] Only some scholars have presented a brief introduction of the HDPF reinforcement technology. In this paper, a test was carried out to assess the axial bearing capacity of high ductility polyester fibers and two reinforced concrete columns in previous studies mainly aimed at the effect of reinforcement form, reinforcement spacing, length ratio, and concrete strength on the restraint performance, bearing capacity, and failure mode of reinforced concrete columns strengthened with HDPF.[14] In this paper, the eccentric compression test of reinforced concrete square columns
GPa, the yield strength is 336 MPa, and the ultimate strength is 440 MPa. The elastic modulus of the HRB335 steel bar is 200 GPa, the yield strength is 405 MPa, and the ultimate strength is 532 MPa. The elastic modulus of polyester fiber ribbons is 6.25 GPa and the fracture strength is 600 MPa.
