Experimental research on anchorage performance of headed reinforcement in concrete beam-column joints
In order to research the anchorage performance of headed reinforcement in concrete beam-column joints,a total of 33 quasi-beam-column joints were designed,which met the structural requirements of current codes.The influence of concrete strength,anchorage length,anchorage plate size,stirrup spacing,and other parameters on the bearing capacity of headed reinforcement was analyzed by the test data.An empirical formula of anchorage force of headed reinforcement was obtained by fitting the experimental data,and the design proposal of anchorage length of the headed reinforcement was put forward.Based on the test database,the proposed formula and the Chinese code formula were statistically analyzed.The results show that the concrete strength,anchorage length,and anchorage plate size have a marked impact on the bearing capacity of headed reinforcement.The bearing capacity is not very sensitive to stirrup spacing,and the anchorage force shared by the anchorage plate accounts for more than 70％of the total anchorage force.The regulation in China code on the proportion of anchorage plate sharing is relatively small.The code regulation on anchorage length may be unsafe.It is suggested that the anchorage length of headed reinforcement in the corner joint of the middle-story beam-column of a cast-in-place frame should be adjusted to 0.45lab(lab is the basic anchoring length in China code),and the anchorage length in the side joint of the middle-story beam-column should not be adjusted.
NETL
NSTL
万方数据
维普
