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Energy dissipation capacity for waffle-flat-plate structures subjected to bi-directional seismic loadings

机译：维夫饼平板结构进行双向地震载荷的能量耗散能力

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摘要

The seismic capacity of buildings is usually studied through separate analysis of two orthogonal directions, then combined using empirical rules. Nevertheless, the three-dimensional nature of seismic action gives rise to interaction among its different components, especially the two horizontal ones, which can cause substantial discrepancy between the actual 3D response and the one obtained by combining uniaxial responses. The present study addresses this problem for waffle-flat-plate (WFP) structures with an irregular layout of columns from the standpoint of energy dissipation capacity. A portion of a WFP prototype structure that was built in Laboratory was subjected, simultaneously, to two horizontal components of a far-field seismic record upon a shake-table. Several shakings of increasing intensity were applied until the collapse of the structure. Afterwards, a numeri-cal model of the specimen was developed and validated with the experimental results. The numerical model was subjected to several sets of ground motions having diverse ratios of energy input from the horizontal compo-nents. When the total energy dissipated by the structure through cumulative plastic deformations until failure was obtained for each set of accelerograms, a fairly stable quantity was found to be concentrated within a narrow range of values. Moreover, the specimen subjected to bi-directional seismic loading showed a higher ultimate energy dissipation capacity than under uni-directional loadings.
机译：建筑物的地震能力通常通过单独分析两个正交方向进行研究，然后使用经验规则结合。然而，地震作用的三维性质引起其不同组分之间的相互作用，尤其是两个水平的组分，这可能导致实际3D响应与通过组合单轴反应而获得的重大差异。本研究解决了从能量耗散能力的角度下具有不规则布局的华夫饼平板（WFP）结构的这个问题。同时对实验室内置的WFP原型结构的一部分进行对摇动台上的远场地震记录的两个水平部件进行。施加了几种增加强度的抖动，直到结构的崩溃。之后，通过实验结果开发并验证了标本的Numeri-Cal模型。对数值模型进行几组接地运动，具有从水平组合物中的各种能量的能量。当通过累积塑性变形而通过结构消散的总能量直到为每组加速器造影获得衰竭时，发现相当稳定的量在窄的值范围内浓缩。此外，对双向地震载荷进行的样品显示比单向载荷下的最终能量耗散能力较高。

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