内爆荷载作用下结构等效静载计算方法

Equivalent Static Load Calculation Method of Structure Subjected to Internal Explosion

爆炸发生在结构内部时 ,结构受到双重荷载作用 :瞬时的冲击波荷载和长时间的准静态气体压力。针对内部荷载特点 ,采用等效单自由度法推导出了用于计算等效静载的动效系数解析式 ,并根据冲击波脉冲作用时间远远小于结构自振周期的情况 ,给出了简化表达式。参照此简化表达式 ,并根据计算的精确值 ,获得了具有明确的物理意义 ,可以代替原复杂解析式的精确简化表达式 。

When explosion took place inside structures, the structure bore dual load: the transient shock wave and long duration quasi-static gas pressure. According to the characteristic of the internal explosion load, analytic solution of the dynamic effect coefficient has been derived by using the equivalent single degree of freedom method. A simplified formula suitable to very short duration of shock wave was obtained. With the simplified formula and the analytic solution, an accurate simplified formula was obtained which possess obvious physical meaning, can replace the complicated analytic solution and simplify the design process of structure subjected to internal explosion load.