Abstract：To study the hysteretic behavior of tapered concrete-filled double skin steel tubular(CFDST) beam-columns with large hollow ratio, a total of ten tapered CFDST specimens, including eight cyclic loading specimens and two monotonic loading specimens, were tested. The influence of hollow ratio(0.6 and 0.8) and axial compression ratio(0, 0.2, 0.4 and 0.6) on the failure modes, the P-Δ relationship curves and hysteresis performance of specimens were investigated, respectively. A numerical model for the specimens under monotonic loading was also established to analyze the working mechanism of the beam-columns. Finally, the simplified calculation method for the lateral bearing capacity of tapered CFDST beam-columns was discussed. The test results show that the damage patterns of the specimens with different hollow ratio are basically same, and local damage with different extents was observed at the lower part of the specimens. The P-Δ curves of specimens under the cyclic loading are relatively full, showing a good seismic performance of tested specimens. The hollow ratio(0.6 and 0.8) has little effect on the lateral capacity and ductility, and the peak load of two specimens with different hollow ratio differs by about 3% on average. As the axial compression ratio increases, the ultimate load decreases and the ductility gradually deteriorates. The strength degradation of all cyclic loading specimens is slight, but a more significant stiffness degradation occurs for the specimen with a hollow ratio of 0.8. The average displacement ductility coefficient of the tested specimens is 3.56 while the average value of the viscous damping coefficient is 0.322, which shows that the CFDST specimens better energy dissipation behavior. When the hollow ratio incease from 0.6 to 0.8, the viscous damping coefficient of the specimens increases by 15% on average.
史艳莉 纪孙航 王文达 张宸 范家浩. 大空心率圆锥形中空夹层钢管混凝土压弯构件滞回性能研究[J]. 土木工程学报, 2022, 55(1): 75-88.
Shi Yanli Ji Sunhang Wang Wenda Zhang Chen Fan Jiahao. Study on hysteretic behavior of tapered concrete-filled double skin steel tubular beam-columns with large hollow ratio. 土木工程学报, 2022, 55(1): 75-88.
