多连拱形迎爆面对结构抗爆效果的影响

为了评估多连拱形迎爆面对结构抗爆效果的影响,该文采用ABAQUS建立了具有等抗弯刚度的多连拱板形结构和单层平板结构的数值模型,利用耦合欧拉-拉格朗日算法(Coupled Eulerian-Lagrangian,CEL)对两种结构与空气冲击波之间的相互作用进行了研究,并对比了两种结构在化爆和核爆作用下的动力响应特性。在化爆作用下,和平板结构相比,多连拱形迎爆面能够改变爆炸冲击波的入射角及反/绕射路径,从而降低结构表面冲击波反射超压峰值、缩短正压持续时间、减小在x方向支座反力及底板中心点位移,因此能够显著削弱冲击波对结构的影响。然而,由于核爆冲击波会在结构表面快速形成持续稳定的空气高压区,后续爆炸冲击波相当于作用在空气高压区上,并且核爆炸冲击波会在相邻拱形面的连接处发生叠加,因此多连拱板形结构并不能起到明显的抗击核爆的作用。

In order to evaluate the ef fect of multi-arch sur faces on the structural anti-explosion per formance,numerical models of the multi-arch plate structure and single-layer plate structure with equal bending stif fness were established by ABAQUS.Coupled eulnerian-Lagrangian(CEL)algorithm was applied to study the interaction between the structures and the air shock wave.In this work,the dynamic characteristics of the two structures under the action of chemical explosion and nuclear explosion were compared.In contrast to the f lat plate structure,under chemical explosion,the incident angle and the ref lection/diffraction path of the blast wave can be changed by the multi-arch surface,decreasing the overpressure peak of the surface shock wave,shortening the duration of positive pressure,reducing the support force in the x direction and the displacement of the center point.As a result,the impact of the shock wave on the structure can be weakened.However,when under nuclear explosion,a continuous and stable high pressure air zone around the multi-arch plate structure can be formed in a very short period of time.The subsequent incident blast wave was imposed on the surface of high pressure air zone.Moreover,the nuclear explosion shock wave tends to overlap at the junction of adjacent arch planes.Therefore,multi-arch plates can not signif icantly weaken the impact of nuclear explosion load on the structure.