Central columns have long been demonstrated to play a vital role in withstanding not only static gravity loads but also seismic loads like earthquakes. A series of modeling tests are implemented on shaking table instrument to reflect the mechanism of soil — structure interaction and examine the validity of method of uplifting underground structural seismic resistance through strengthening central columns. An innovative method of enhancing central columns by adhering carbon fiber cloth onto column’s peripheral surface is introduced into a series of shaking table modeling tests, in which two two-layer underground model structures are constructed for comparison, one without any column remedy acts as a benchmark for reference and the other is amended with carbon fiber cloth adhered on column surface. Test results show that soft round model box adopted in tests serves well in simulating earthquake actions with negligible boundary effects on wave transfer; soil dynamic characteristics and the relative stiffness of structure to surrounding soil will interactively limit mutual motion and deformation. Racking deformation assumption may be not applicable for overall two-layer underground structure deformation analysis, but may be suitable for inter-layer displacement calculation for single layer in multi-layer rectangular underground structures. The adopted column enhancement measure could not only greatly increase the stiffness ratio of model structure to soil, reducing structure deformation, but also improve the integrity of underground structure by narrowing down the deformation difference between two structural layers, certifying that such a measure could be validly used in improving the seismic resistance capacity for already built underground structures without enough aseismic consideration when designed.

中文翻译：

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增强中心柱地下结构抗震性能的振动台试验研究

长期以来，中心柱已被证明在承受静态重力载荷和地震等地震载荷方面发挥着至关重要的作用。对振动台仪器进行了一系列的建模试验，以反映土-结构相互作用的机理，检验通过加强中心柱提高地下结构抗震能力的方法的有效性。在一系列振动台建模试验中引入了一种创新的方法，即通过将碳纤维布粘附在柱的外围表面来增强中心柱，其中构建了两个两层地下模型结构进行比较，其中一个没有任何柱补救措施作为基准供参考，另一个用碳纤维布在柱子表面粘合。试验结果表明，试验中采用的软圆形模型箱可以很好地模拟地震作用，对波传递的边界效应可以忽略不计；土的动力特性和结构与周围土的相对刚度将相互作用限制相互运动和变形。货架变形假设可能不适用于整体二层地下结构变形分析，但可能适用于多层矩形地下结构中单层的层间位移计算。采用柱增强措施不仅可以大大提高模型结构与土体的刚度比，减少结构变形，而且可以通过缩小两个结构层之间的变形差异来提高地下结构的完整性，