为了揭示爆破荷载作用下混凝土 T 梁桥的动态响应及破坏律,制作了两种不同纵向长度的混凝土 T 梁桥模型,测量 T 梁桥模型的应变值,以及爆炸前后模型的加速度值和声波速度,进行分析比较.研究表明,T 梁桥模型的动态响应在横向1/4处比梁中心更敏感;纵向长度长的混凝土 T 梁桥在相同荷载作用下更容易发生破坏;混凝土 T 梁桥在存在损伤积累以后,梁肋板更容易先破坏;这为桥梁抢修和设计提供依据,提高其抗爆性.%In order to research the dynamic response and failure law of concrete T-beam bridge under blasting load,two kinds of concrete T-beam bridge models with different longitudinal lengths were made.Strain value,acceleration value and sound velocity of the model before and after the explosion of T-beam bridge are measured and analyzed.The study shows that the dynamic response of the T-beam model is more significant in the horizontal 1/4 direction than in the beam center and under the same load,the longer the longitudinal length,the concrete T-beam bridge is more likely to damage;what's more if there is accumulation of damage of concrete T-beam bridge,beam ribs are more likely to be destroyed firstly.These findings provide the basis for bridge repair and its improvement of antiknock performance.
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