减震装置提高防护门抗力的理论分析

Theoretical Analysis of Shock-mitigating Device to Increase the Resistance of Protective Door

在端部采用减震装置可提高防护门的抗力,而且该减震装置会影响防护门的振动特性和动力响应,因此对其在爆炸载荷作用下的动态响应分析非常重要。本文建立了具有减震装置防护门的计算模型,推导出了结构在爆炸荷载作用下的解析计算式,分析了化爆和核爆荷载作用下减震装置对振动的影响规律。结果表明,由弹性支承和阻尼器组成的减震装置可以明显降低结构的动力系数,从而提高防护门的抗力,但提高的效果与弹性支承的刚度、载荷作用时间的长短以及振动衰减的程度相关。

Shock-mitigating device adopted at both ends can improve the resistance of protective door,and the device has great effect on vibration characteristics and dynamic responses of the door,Therefore,it is necessary to study the dynamic responses of the structure to explosion loading.The computational model of the protective door with shock-mitigating device is established,and the analytical expressions of the structure under explosion loadings are deduced.The effects of shock-mitigating device on dynamic responses to loads induced by chemical explosion and nuclear explosion are also studied.The analysis shows that shock-mitigating device consisting of elastic support and damping support can make the dynamic coefficient decrease obviously.Therefore,the bearing capacity to resist explosive loads can be relatively increased, but the effectiveness lies on the stiffness of elastic support,actuation duration of explosion loading and vibration damping.