某桥墩撞击状态力学行为分析

Mechanical Behavior Analysis of the Impact of a Damaged Bridge Pier

以某因撞击而受损桥墩为工程背景,建立实体及杆系有限元仿真模型,在研究分析时采用静力分析及有限元建模相结合的方法.在现场调查分析基础上,通过折减桥墩被撞击面的壁厚模拟分析桥墩损伤后的刚度变化,分析受损桥墩撞击状态及成桥状态的受力行为.计算结果表明:桥墩被撞击时,最大压应力出现在撞击点,最大拉应力在出现在桥墩撞击点高程的两圆弧侧面、撞击点桥墩区域;受损桥墩裂缝较大处箍筋屈服的概率很大.

Based on the impact of a damaged bridge pier,the finite element simulation model of the solid and the rod system is established. In the research, adopts the combination of static analysis and the finite element modeling method. On the basis of field investigation and analysis, it analyzes the state of the damaged bridge pier collision and stressed behavior. The calculation results show that： when the bridge was hit,the maximum compressive stress appears at the point of hitting.