近地端水平冲击作用下RC桥墩的动力响应试验研究

Dynamic Response of RC Bridge Piers under Near-Ground Lateral Impact Loading

为了研究钢筋混凝土(RC)桥墩在近地端水平冲击作用下的动力响应,采用水平撞击试验设备,对3根圆形截面RC桥墩进行了试验研究。本试验以撞击速度为研究变量,得到了桥墩的撞击力时程曲线、位移时程曲线、变形曲线和最终损伤状态。试验结果表明:桥墩在1.70 m/s、2.68 m/s和3.32 m/s三种撞击速度下呈现出轻微损伤、中等损伤和严重损伤三种破坏形态,桥墩的破坏模式为撞击部位与墩底之间的局部剪切破坏,撞击速度对桥墩冲击动力响应和破坏机制有显著影响。本试验可以为车辆撞击桥墩问题的有限元数值模拟提供数据支撑。

In order to study the dynamic response of reinforced concrete(RC)piers under the action of nearground lateral impact,three RC piers with circular cross-section were tested by using the horizontal impact facility.The impact velocity was used as the research variable to obtain the impact force time histories,displacement-time histories,deformation curves,and final damage patterns of the bridge pier.The test results showed that the pier exhibited three damage patterns of minor damage,moderate damage,and severe damage under three impact velocities of 1.70 m/s,2.68 m/s,and 3.32 m/s.Brittle local shear damage was observed between the impact point and the pier bottom,and the impact velocity was found to have a significant effect on the dynamic response and damage mechanism of the pier under impact loading.This test can provide valuable data for the finite element numerical simulation of vehicle-bridge pier collision.