爆炸荷载作用下弹性梁的能量解析法分析

Analysis of elastic joint beam on the load of explosion

爆炸荷载作用下结构的分析分为两类:波动理论和振动理论。因为爆炸荷载持续时间非常短暂,并且应力波在结构构件中的传播非常迅速,所以爆炸荷载作用下结构构件的反应主要以整体振动为主。根据爆炸荷载持续时间与结构构件特征周期的比例关系,结构构件在爆炸荷载作用下的反应可以分为脉冲荷载区、准静态荷载区和动态荷载区。本文作者根据能量守恒基本原理,推导了弹性简支梁在爆炸荷载作用下的基本计算公式,重点研究了动态荷载区弹性简支梁的反应特征,并提出了荷载时间系数的概念。通过大量的有限元分析,得到了弹性简支梁荷载时间系数在不同荷载区的计算公式,为弹性简支梁的抗爆分析提供了理论依据。

The analysis of structure on the load of explosion can be divided into two theories： wave theory and vibration theory. Because the duration of explosion load is very short, and the wave velocity is very quick in the structure, the reaction of structure on the load of explosion mainly belongs to the vibration theory. According to the duration of explosion load, the reaction of structure can be divided into three regions： pulse load region, static state load region and dynamic load region. In this paper, according to the law of energy conservation, induce the formula of elastic joint beam on the load of explosion, mainly study the character of joint beam in the dynamic region, and give out the conception of load duration coefficient, provide the basis for the analysis of beam＇s resist to explosion load.