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Experimental study of the seismic response of a structure set amongst closely adjacent structures

机译：紧密相邻结构中结构集的地震响应的实验研究

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The influence of soil on the dynamic response of soil-structure systems is usually studied on a stand-alone (SA) structure, even though closely adjacent structures form the vast majority of the population, especially in large cities. When structures are closely adjacent to each other, the wavefield in the soil, generated by the vibration of the footings, produces a complex interaction between them. Scant attention, especially by physical experiments, has been paid to this interaction. This work addresses the seismic response of a single degree-of-freedom structure (structure of focus) considering the influence of one and two closely adjacent neighbours. Experiments were performed using a large laminar box filled with sand sitting on a shake table. Results from utilising four recorded ground motions from the 2010-2011 Canterbury earthquake sequence are analysed. The effect of adjacent structures on the acceleration and displacement of the top mass of each structure, as well as the uplift of the footings, are discussed. Changes in the fundamental frequency due to the presence of neighbouring structures are identified. The use of the SA system, without consideration of closely adjacent structures, may result in a significant error in the estimation of the response of the structure of focus. In general, acceleration, lateral displacement and uplift reduced in comparison with that of the corresponding SA case. A footing settlement mechanism, resulting from uplift of the system that reflects the influence of adjacent structures, is also revealed.
机译：土壤对土结构系统动态响应的影响通常在独立（SA）结构上进行研究，尽管紧密相邻的结构形成绝大多数人口，尤其是大城市。当结构彼此紧密相邻时，通过基位的振动产生的土壤中的波场产生它们之间的复杂相互作用。尤其是通过物理实验的严重关注，已经支付了这种互动。这项工作解决了单一自由度结构（焦点结构）的地震反应，考虑到一个和两个紧密相邻的邻居的影响。使用大型层箱坐在摇动台上的坐在摇动台上进行实验。分析了来自2010-2011坎特伯雷地震序列的四个记录的地面运动的结果。讨论了相邻结构对每个结构的顶部质量的加速度和位移的影响，以及基础的隆起。鉴定了由于相邻结构的存在而导致的基波频率的变化。使用SA系统，不考虑紧密相邻的结构，可能导致估计焦点结构的响应估计的显着误差。通常，与相应的SA壳体的相比，加速，横向位移和隆起减小。还揭示了由反映相邻结构的影响的系统隆起产生的脚踏沉降机制。

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