English：

Based on the Nanshan Bridge Project in Hunan Province, the influence of steel fiber reinforcedconcrete on the seismic performance of joints in cast⁃in⁃place areas is studied through three equalproportion external precast concrete beam⁃column joints. The joints are composed of precast columns withcorbels, U⁃shaped open precast beams, and post⁃pouring fiber reinforced concrete. The volume contentof steel fiber in cast⁃in⁃place concrete is 0, 0.5%, and 1%, respectively. The vertical quasi⁃static loadwas applied to the beam end in the test. The results indicate that the ultimate bearing capacity of the jointcan be improved by adding steel fiber to the cast⁃in⁃place concrete, the energy dissipation can beincreased by 17. 7%, and the stiffness of the joint can be significantly enhanced. The steel fibereffectively delays the occurrence of cracks and inhibits their expansion, so that the crack length in thecore area of the joint is significantly shortened, showing obvious deflection hardening characteristics,which is consistent with the conclusion of the material test. The test results indicate that the connectionstructure is simple in construction and has good seismic performance.