RPC箱型桥墩抗震性能的试验研究与数值分析

以RPC箱型桥墩为研究对象,拟定合理结构形式和尺寸,设计了3个RPC箱型墩试件。通过对试件施加常轴力以及水平反复荷载,研究了水平荷载加载方向角对RPC箱型墩抗震性能的影响,分析了各试件的韧性、滞回曲线、骨架曲线、荷载退化曲线和刚度退化曲线等方面的特征,并得出了各试件的位移延性系数和耗能系数。作者编制并验证了单向荷载作用下的全过程非线性数值分析程序。实验与数值结果表明:RPC箱型墩具有较好的抗震性能,水平荷载加载方向角是影响箱型墩抗震性能的一个重要因素;斜向受力构件的抗震性能要弱于主轴受力构件。

Experimental Study and Numerical Analysis of the Seismic Performance of Reactive Power Concrete Box Pier

Taking a reactive power concrete (RPC) box pier as the object of study, 3 specimens with reasonable cross-section size and structure conformation were firstly designed. The effect of the direction angle of horizontal loading on the seismic performance of RPC box pier was experimentally studied through applying constant axial force and horizontal cyclic load. The ductility, hysteresis curve, skeleton curve, load degradation curve and stiffness degradation curve of specimen were studied, and the displacement ductility factor and energy loss factor of specimens were obtained. Non-linear numerical analysis program describing the complete process of specimen under one-way loading was compiled and verified by experimental results. Numerical and experimental results show that RPC box pier presents good seismic performance, and the direction angle of horizontal loading is a key factor in seismic performance of box pier, and the component subjected to oblique force presents weaker seismic performance than that of component subjected to axial force.