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为了研究化爆作用下地下拱结构表面荷载分布的规律,简述了目前化爆条件下结构上荷载均布化的3种方法,提出了适用于地下拱结构抗爆设计的荷载分布假设,即拱结构横截面上荷载呈三角形分布,且纵向荷载均布。通过有限元数值模拟,比较分析了4种工况动载峰值荷载作用下拱结构在弹性阶段、塑性阶段的受力状况和结构响应,并与动荷载作用下的结构响应进行对比分析。结果表明,相较于化爆条件下拱结构所受圆锥状荷载,把化爆条件下拱结构所受荷载假设为横截面上三角形分布、沿纵向均匀分布时,拱结构响应相似;按荷载总集度相等原则提出的荷载简化方法仍偏于保守,可以作为一种用于工程设计的简化计算方法。
In order to study the regularity of the surface load distribution of underground arch structure under the effect of detonation, three methods of uniform load distribution on the structure under the current detonation condition are briefly described, and the load distribution assumption applicable to the antiknock design of the underground arch structure is proposed The load on the cross section of the arch structure is triangular, and the longitudinal load is uniform. Through the finite element numerical simulation, the stress state and the structure response of the arch structure in the elastic phase and the plastic phase under four kinds of working dynamic peak loads are comparatively analyzed, and compared with the structural response under the dynamic load. The results show that compared with the cone-shaped load under the detonation condition, the arch structure under the detonation condition is assumed to be triangular distribution in the cross-section and uniform in the longitudinal direction, The simplified method of load reduction proposed by the principle of equal degree of concentration is still conservative and can be used as a simplified calculation method for engineering design.