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Seismic structure-soil-structure interaction between pairs of adjacent building structures

机译:成对的相邻建筑结构之间的地震结构-土壤-结构相互作用

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摘要

Structure–soil–structure interaction between adjacent structures, which may occur in densely populated urban areas, has received little attention compared to the soil–structure interaction of single isolated structures. Additionally, recent earthquakes in/near such areas (e.g. the Christchurch series, 2010–2011) have shown that large motions can be followed by strong aftershocks. In this paper, the seismic behaviour of isolated structures and pairs of adjacent structures under a sequence of strong ground motions has been investigated using a combination of centrifuge and finite-element modelling. The latter utilised an advanced constitutive model that can be parameterised from routine test data, making it suitable for use in routine design. The finite-element models were shown to accurately simulate the centrifuge-measured response (in terms of surface ground motion and structural sway, settlement and rotation) even after multiple strong aftershocks, so long as the buildings' initial conditions were reproduced accurately. For the case of a building structure with a close neighbour, structural drift and co-seismic settlement could be reduced or increased as a result of structure–soil–structure interaction, depending chiefly on the properties of the adjacent structure. This suggests that careful arrangement of adjacent structures and specification of their properties could be used to control the effects of structure–soil–structure interaction. In all cases where adjacent structures were present, permanent rotation (structural tilt) was observed to increase significantly, demonstrating the importance of considering structure–soil–structure interaction in assessing the seismic performance of structures.
机译:与单个孤立结构的土壤-结构相互作用相比,邻近结构之间的结构-土壤-结构相互作用可能很少发生在人口稠密的城市地区。此外,最近在此类地区/附近发生的地震(例如,克赖斯特彻奇系列,2010-2011年)表明,大运动之后可能会发生强烈余震。本文采用离心和有限元建模相结合的方法,研究了一系列独立的结构和相邻结构对在一系列强烈地面运动下的抗震性能。后者利用了可以从常规测试数据中进行参数化的高级本构模型,使其适用于常规设计。示出了有限元模型,即使在多次强余震之后,只要能准确地再现建筑物的初始条件,它们也可以准确地模拟离心机测得的响应(就地表运动和结构摇摆,沉降和旋转而言)。对于邻近的建筑结构,结构-土壤-结构相互作用的结果可能会减少或增加结构漂移和同震沉降,这主要取决于相邻结构的特性。这表明可以仔细安排相邻结构并指定其特性,以控制结构-土壤-结构相互作用的影响。在所有存在相邻结构的情况下,都观察到永久旋转(结构倾斜)显着增加,这表明在评估结构的抗震性能时考虑结构-土壤-结构相互作用的重要性。

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