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为了研究混凝土填充高度对部分填充圆形钢管混凝土桥墩柱抗震性能的影响,根据混凝土填充高度的不同设计了4根桥墩柱试件,其中1根空钢管桥墩柱和3根部分填充圆形钢管混凝土桥墩柱。通过在桥墩柱顶施加恒定的轴向压力及水平低周往复荷载的拟静力试验获得各试件荷载-位移滞回曲线及破坏形态等试验数据。利用各试件荷载-位移骨架包络曲线和耗能能力等试验结果,分析了混凝土填充高度对该类桥墩柱抗震性能的影响。结果表明:混凝土的填充没有改变桥墩钢管局部失稳的破坏形态,但延缓了钢管失稳变形的发展;同时随着混凝土填充高度的增加极限承载力、延性、耗能能力等都有较大提高,达到极限承载力后,承载力下降随着混凝土填充高度的增加变缓,表现出良好的抗震性能。
In order to study the influence of concrete filling height on the seismic performance of partially filled circular CFST pier, four specimens of pier were designed according to the different filling height of concrete. One hollow steel pipe pier and three partially filled circular CFST Pier column. The test data of load-displacement hysteresis curve and failure mode of each specimen were obtained by pseudo-static test with constant axial pressure and horizontal low-cycle reciprocating load on the top of pier. Based on the test results of load-displacement skeleton envelope curve and energy dissipation capacity of each specimen, the influence of concrete filling height on the seismic performance of the bridge piers is analyzed. The results show that the filling of concrete does not change the failure mode of partial failure of the piers, but delays the development of the instability deformation of the steel pipe. At the same time, the ultimate bearing capacity, ductility and energy dissipation capacity increase greatly with the increase of concrete filling height , After reaching the ultimate bearing capacity, the bearing capacity decreases with the increase of the filling height of concrete, showing good seismic performance.