目的 研究不同打击模式下钢筋混凝土预应力T梁桥的毁伤效应，为钢筋混凝土预应力T梁桥的毁伤评估及打击决策提供参考。方法 通过数值仿真研究某弹药装药空中爆炸、接触爆炸和内爆炸3种打击模式下，钢筋混凝土预应力T梁桥的毁伤效应。结果 不同打击模式下钢筋混凝土预应力T梁桥的毁伤模式差异较大:空中爆炸和接触爆炸桥梁主要发生桥面破孔及塑性变形;内爆炸桥梁除桥面发生层裂破碎外，T梁腹板及横隔梁也发生外凸变形、混凝土崩塌破坏等。结论 半密闭空间内爆炸T梁桥的毁伤效果要优于桥面接触爆炸和空中爆炸。

The work aims to study the damage effect of reinforced concrete prestressed T-beam bridge under different attack modes, so as to provide reference for the damage assessment and attack decision-making. The damage effect of a reinforced concrete prestressed T-beam bridge under 3 attack modes of aerial explosion, contact explosion and semi enclosed space explosion of ammunition was studied through numerical simulation. The damage modes of reinforced concrete prestressed T-beam bridge under different attach modes were quite different. Aerial explosion and contact explosion mainly caused perforation and plastic deformation damage to the bridge deck. While, semi enclosed space explosion mainly caused layered cracking to the bridge deck and bulging deformation and concrete collapse to the web and crossbeam. Damage effect of the T-beam bridge in semi enclosed space explosion is better than that in aerial explosion or contact explosion.