强震下钢筋混凝土Y型桥墩的抗震性能评估

Seismic performance evaluation of reinforced concrete Y-shaped pier under strong earthquake

为了研究城市高架桥墩的非线性动力行为特点,在有限元模拟的基础上,对典型的钢筋混凝土Y型桥墩抗震性能进行了评估.分别从桥墩截面性能和桥墩整体构件性能两个层次进行评估,结果表明,在桥墩截面抗震性能评估中得到了桥墩截面在不同轴压比下的弯矩曲率曲线,推导出截面抗震性能评估公式,绘制了轴压比和曲率延性系数曲线;在桥墩构件抗震性能评估中分析了桥墩位移延性能力,并选取墩高和轴压比为控制变量对比分析了Y型桥墩构件的整体耗能特点.

In order to study the nonlinear dynamic behavior characteristics of elevated piers in cities,based on the finite element simulation,the seismic performance of typical reinforced concrete Y-shaped pier was evaluated.The cross section and the integral component performances of the piers were evaluated,respectively.The results show that the bending moment-curvature curves of pier section under different axial compression ratios can be obtained during the seismic performance evaluation of pier section;the seismic performance evaluation formula was derived;the relationship curve for axial compression ratio and curvature ductility coefficient was drawn.The ductility capacity of pier displacement was analyzed in the seismic performance evaluation of pier components;the overall energy dissipation characteristics of Y-shaped pier components were analyzed and compared,through taking the pier height and axial pressure ratio as the controlling variables.