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为了计算爆炸荷载作用下地下拱形结构上的动荷载,引入了Costantino荷载模型考虑拱结构拱曲率对介质-结构相互作用机理的影响,在单自由度体系位移模式的基础上利用虚功原理,求解爆炸荷载作用下拱形结构的反射系数,即作用到结构上的均布动荷载峰值与结构板块处自由场应力的均布峰值之比。讨论了拱曲率、结构刚度、介质参数对反射系数的影响。在此基础上,与规范中平顶结构的综合反射系数计算方法进行了比较,引入修正系数对公式进行修正,改进后的反射系数计算方法对于不同的结构形式具有更广泛的适用性。
In order to calculate the dynamic load on the underground arch structure under the action of explosion load, the influence of the arch curvature of the arch structure on the medium-structure interaction mechanism is considered by introducing the Costantino load model. Based on the displacement principle of the single freedom system, The reflection coefficient of the arch structure under the action of explosion load is calculated as the ratio of the peak value of uniform dynamic load applied to the structure to the uniform peak stress of the free field at the structural plate. The effects of arch curvature, structural stiffness and dielectric parameters on the reflection coefficient are discussed. On this basis, compared with the method of calculating the total reflection coefficient of the mid-level roof structure, the correction coefficient is introduced to correct the formula, and the improved reflection coefficient calculation method has wider applicability to different structure forms.