准静态侧向撞击下钢筋混凝土圆柱桥墩破坏模式判别

当大质量车辆高速撞击桥墩时，产生的巨大撞击力可能导致桥墩损伤甚至破坏。本研究准静态侧向撞击下，钢筋混凝土圆柱桥墩的破坏模式。首先根据经典结构力学理论得到桥墩截面最大内力，结合钢筋混凝土圆形截面抗剪、抗弯承载力计算式，得到钢筋混凝土圆柱桥墩抗侧向撞击破坏的强度条件，最后得到剪切、弯曲、剪切弯曲三种破坏模式的判别标准。采用ABAQUS有限元软件对三种工况进行模拟研究，结果表明破坏模式判别标准具有很好的有效性。

JUDGMENT OF COLLAPSE MODES OF REINFORCED CONCRETE CYLINDRICAL PIERS UNDER QUASI-STATIC LATERAL IMPACT

When a heavy vehicle at a high velocity impacts a bridge pier, the large reaction force generated could cause the pier damage and even collapse. Judging standards for the collapse modes are investigated in the paper.The maximum internal forces are derived based on classical elastic theory, and the strength conditions of lateralimpact collapse of reinforced concrete cylindrical piers are obtained according to previous formulations. Finally, the judging standards for the three collapse modes such as shearing, bending and shearing-bending are obtained. In addition, by using ABAQUS finite element code, three cases are simulated and the results demonstrate good agreement with the models predicted.