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Parametric analysis of groundshock loading on steel plates and reinforced concrete slabs

机译:钢板与钢筋混凝土板地震荷载的参数分析

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摘要

Hardened underground structures are purposely constructed beneath the ground surface for additional protection. The protection and sustainability of such a structure is provided by the soil overburden, supported by the structure's roof slab, also called a primary slab. The soil overburden usually contains one or more layers of protective reinforced concrete slabs, defined as secondary slabs. Hardened sub-surface structures can experience a degree of damage from sub-surface explosions, caused by the detonation of airborne weapons at variable depths within the soil overburden layer. The research objective was to evaluate the degree to which material and geometric parameters influenced the magnitude of groundshock loading and hence the severity of damage to sub-surface positioned reinforced concrete slabs. The work was of an experimental nature, performed within a purposely built test cell. The experimental set-up involved positioning cylindrical charges within the soil overburden at variable standoffs from an initially positioned steel plate, then from a primary slab, which was subjected to a series of cumulative loadings. The structural response of both the steel plate and a reinforced concrete slab were evaluated using an energy balance procedure. A parametric study was performed, determining the influence each geometric parameter had to the magnitude of groundshock loading. The variability of data associated with the material parameters was analysed and compared to the published literature. Numerical simulations were performed at the end of the experimental stage (using the non-linear finite element programme AUTODYN21)) to investigate phenomena that could not be investigated experimentally. A visual damage assessment in the form of a crack pattern analysis and chronological order of occurring mechanisms upon reinforced concrete slabs was performed. The severity of damage to the primary slabs was then associated with the cumulative load impulse history. The research yielded the following conclusions: I. An idealised half sine-wave load distribution approximated the pressure-time history profiles recorded by pressure gauges. 2. The steel plate and one concrete slab (for which conclusive data was obtained) responded impulsively to groundshock loading. 3. The magnitude of groundshock loading was most sensitive to a change in the charge standoff. 4. The reduction in the soil overburden above the top face of a secondary slab did not influence the groundshock loading induced into a primary slab. 5. The effect of the propagating groundshock wave overrode any initial form of soil compaction between the charge and target. This was due to the significantly high stresses induced into the soil, which were well above the initial insitu stresses. 6. Internal weakening of a primary slab, which was unidentifiable from the external damage, caused significant loss in structural strength and stiffness.
机译:硬化的地下结构特意在地面下方建造,以提供额外的保护。这种结构的保护和可持续性是由土壤覆盖层提供的,该覆盖层由结构的屋顶板(也称为初级板)支撑。土壤覆盖层通常包含一层或多层保护性钢筋混凝土板,称为次生板。硬化的地下结构可能会受到地下爆炸的一定程度的破坏,这是由土壤覆盖层内不同深度的机载武器爆炸引起的。研究目的是评估材料和几何参数对地震动荷载大小的影响程度,从而评估地下定位的钢筋混凝土板的破坏严重性。这项工作具有实验性质,是在专门构建的测试单元中进行的。实验设置包括将圆柱形装药以不同的支座位置定位在土壤覆盖层中,该位置从最初放置的钢板,然后从初始平板,承受一系列的累积载荷。使用能量平衡程序评估了钢板和钢筋混凝土板的结构响应。进行了参数研究,确定了每个几何参数对地震动荷载大小的影响。分析了与材料参数相关的数据的可变性,并与已发表的文献进行了比较。在实验阶段的最后进行了数值模拟(使用非线性有限元程序AUTODYN21)来研究无法通过实验研究的现象。进行了视觉损伤评估,形式为裂缝模式分析和钢筋混凝土板上发生机理的时间顺序。然后,将对主要平板的破坏的严重程度与累积载荷冲击历史联系起来。该研究得出以下结论:I.理想的半正弦波负载分布近似于压力计记录的压力-时间历史曲线。 2.钢板和一块混凝土板(已获得最终数据)对地震动荷载有冲动响应。 3.地震动负荷的大小对充电距离的变化最敏感。 4.减少次要平板顶面上方的土壤覆盖层并不会影响引入主要平板的地震动负荷。 5.传播的地震动波的影响推翻了装药和目标之间任何初始形式的土壤压实。这是由于在土壤中产生了很高的应力,该应力远高于初始的原位应力。 6.无法从外部损坏中识别出主板的内部削弱,从而导致结构强度和刚度的显着降低。

著录项

  • 作者

    Beer Leon Robert;

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  • 年度 2006
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  • 原文格式 PDF
  • 正文语种 English
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