分配层厚度对成层式结构动力响应的影响

 主要研究成层式结构中分配层厚度对支撑结构动力响应的影响。首先分析TNT装药在成层式工事遮弹层表面爆炸时结构的动力响应，并与试验结果进行对比分析，分析结果与模型试验吻合较好。在此基础上，然后分析不同分配层厚度条件下支撑结构的变形和破坏规律性。研究结果表明，分配层厚度对支撑结构动力响应的影响很大，支撑结构的破坏主要出现在弹着点正下方区域的顶板上，当分配层厚度小于某一临界值时，支撑结构顶板会出现冲切破坏。分配层厚度越厚，支撑结构上的荷载越均匀，跨中部分和跨端部分荷载的差别越小。建议在条件许可的情况下，适当增加分配层厚度以有效减弱支撑结构的动力响应。

EFFECT OF THICKNESS OF ATTENUATION LAYER ON DYNAMIC RESPONSE OF MULTILAYER PROTECTIVE STRUCTURE

The effect of thickness of attenuation layer on dynamic response of supporting structure in multilayer protective structure is investigated emphatically.Firstly,the dynamic response of model experiment is simulated numerically in the case that TNT explosive is detonated on the upper surface of burster slab,and the results are compared with those of model experiment showing close agreement.Then,the deformation and failure of the supporting structure are studied for various thicknesses of the attenuation layer indicating that the thickness of attenuation layer has an important effect on the supporting structure;the failure zone is located on the top plate of the central span under detonation point,and the punching failure may appear when the thickness of attenuation layer is thinner than a critical value.The difference of the applied loading on the top plate at the end-span and that at the mid-span decreases by increasing the thickness and uniform distribution of loading of the attenuation layer.It is suggested that under certain condition,the dynamic response is weakened effectively by increasing the thickness of attenuation layer.