爆炸荷载作用下简支梁的动力响应分析

I Explosive dynamics and vibration mechanics theory are used to analyse the complex dynamic response of a simply supported beam under blast concentrated loading. The analysis shows that the reponse of a simply supported beam under blast concentrated loading has two stages,the first one is forced vibration under blast concentrated loading and the second one is free vibration . The relationship between deflection and stress is established to get the stress of one point at either stage. The tress provides basis to judge whether the beam is damaged. The relative errors of the maximum deflection are about 8% at the first stage and about 10% at the second stage by comparing theoretical results and numerical simulation results of a specific example.