某受损桥墩受力行为仿真分析

Simulation analysis of stressed behavior of a damaged pier of a bridge simulation analysis

以某因撞击受损桥墩为例,建立实体及杆系有限元仿真模型,采用静力分析及有限元建模相结合的方法对桥墩受损后的力学行为进行了分析。研究结果表明:桥墩被撞击时,最大压应力出现在撞击点,最大拉应力出现在桥墩撞击点高程的2侧圆弧面及撞击点内部;受损桥墩裂缝较大处箍筋屈服的概率大;成桥状态验算时,桥墩撞击面壁厚损伤75%工况下的应力及位移的验算结果接近或基本达到规范相应限值,而桥墩撞击面壁厚损伤100%工况下的验算结果不能满足规范相应限值要求;随着桥墩损伤程度的增加,桥墩的稳定系数逐渐降低。

As an example of a damaged bridge pier, by setting up the entities and the bar system finite element simulation model, its combination of static is analyzed. The calculation results show that： when the bridge is hit, the maximum compressive stress appears at the point of hitting, the maximum tensile stress appears in the impact point elevation of two circular arc profile; The yield probability of stirrup on the pier crack of the damaged bridge is very big; When checking finished bridge state, the result of the stress and displacement of pier impact surface damage wall thickness 75% are close to or reach the specification limits, while that of pier impact surface damage wall thickness 100% could not meet the requirement; With the increasing of pier damage degree, the stability of the pier coefficient decreases.