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首页> 外文期刊>Bulletin of earthquake engineering >Effects of soil-structure interaction on inelastic response of torsionally-coupled structures
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Effects of soil-structure interaction on inelastic response of torsionally-coupled structures

机译：土结构相互作用对扭转耦合结构的非弹性响应的影响

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摘要

In this paper, effect of torsion on the inelastic responses of structures resting on a nonlinear flexible medium is studied. Similar studies have shown that soil-structure interaction can result in augmentation of nonlinear responses of lower stories. The focus here is on the plan-wise distribution of inelastic responses of a torsional structure considering soil-structure interaction (SSI). For this purpose, 4, 8, and 12-story steel structures consisting of special moment frames are considered on a relatively soft soil. A nonlinear set of non-uniform springs is used for modeling of SSI. For each building, different structural responses are calculated under 11 suitably scaled earthquake ground motions at the design basis and maximum considered earthquake hazard levels. The mass eccentricity ratio is varied from zero to 30%. The inelastic responses include the story drift ratios and distribution of plastic hinge rotations and performance levels of each story and frame. The results clearly show that SSI increases the drift ratio of the first story up to 30% regardless of the eccentricity value. On the other hand, SSI amplified the cumulative plastic hinge rotation of the upper stories, especially in the taller buildings. The maximum value of amplification exceeded 3 and it was very sensitive to the extent of eccentricity. The local amplification effect of combination of torsion and SSI was much more severe where it reached values over 8 in the outer frames of the buildings, with SSI having the larger share in amplification.
机译：本文研究了研究基于在非线性柔性介质上搁置在非线性柔性介质上的结构的扭转效应。类似的研究表明，土壤结构相互作用可能导致下故事的非线性响应的增强。这里的重点是考虑土壤 - 结构相互作用（SSI）的扭转结构的非弹性响应的计划分布。为此目的，由特殊时刻框架组成的4,8和12层钢结构被认为是相对柔软的土壤。非线性套的非均匀弹簧用于SSI的建模。对于每个建筑物，在设计基础上以11个适当的地震地面运动计算不同的结构响应，并且最大地考虑过地震危险水平。质量偏心比从零增加到30％。非弹性响应包括故事漂移比和分布塑料铰链旋转和每个故事和框架的性能水平。结果清楚地表明，无论偏心值，SSI如何增加第一个故事的漂移比到30％。另一方面，SSI放大了上层故事的累积塑料铰链旋转，特别是在较高的建筑物中。超过3的最大值，对偏心度的程度非常敏感。扭转和SSI组合的局部扩增效果更严重，其中它在建筑物的外框架中达到8的值，SSI具有更大的放大份额。

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