钢管混凝土桥墩抗震性能试验研究

为研究钢管混凝土桥墩的抗震性能,对钢管混凝土桥墩和钢筋混凝土桥墩进行了拟静力对比试验研究。根据试件的破坏发展过程以及各试件的滞回曲线和骨架曲线,分析了其滞回性能、耗能能力、延性、强度退化及刚度退化等抗震性能。试验结果表明,钢管混凝土桥墩的抗震性能明显好于钢筋混凝土桥墩。在含钢率和轴力相同的情况下,钢管混凝土桥墩的滞回曲线比钢筋混凝土桥墩丰满得多,前者的耗能能力约为后者的4.46倍,钢管混凝土桥墩的延性大于钢筋混凝土桥墩;随着轴压比的增大,钢管混凝土桥墩延性有所下降,强度退化加快,但对其刚度退化的影响不大。

Experimental Study on Seismic Performance of Concrete-Filled Steel Bridge Piers

In order to study the seismic behavior of concrete-filled steel bridge piers, an experiment of two concrete-filled circular steel bridge pier specimens and one reinforced concrete pier specimen was carried out subjected to reversed cyclic lateral loading combined with constant axial compression force. Based on the failure process of each specimen, the hysteretic curves and skeleton curves, the seismic performance, such as hysteretic behavior, energy dissipation, ductility, strength reduction and stiffness degradation were analyzed. The test results show that concrete-filled steel bridge piers exhibit much better seismic behavior than reinforced concrete piers in condition of the same axial compression force and equal amount of steel. The hysteretic loops of the concrete-filled steel bridge pier specimen are much fuller than that of the reinforced concrete pier specimen. And the energy dissipation capacity of the former is 3.46 times more than that of the latter. The ductility of the former is better than that of the latter. The results also indi- cate that the ductility of concrete-filled circular steel bridge piers decreases and the strength reduction increases with axial load ratio increasing. But it seems that axial load ratio has little effect on stiffness degradation.