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Dimensional analysis of dynamic interaction between adjacent SDOF buildings to forward directivity and fling step pulses
Soil Dynamics and Earthquake Engineering ( IF 4 ) Pub Date : 2021-06-16 , DOI: 10.1016/j.soildyn.2021.106831
Yang Lu , Feng Xiong , Huiqun Yan , Qi Ge

A series of parametric analyses are conducted to investigate the combined effects of impact and structure-soil-structure interaction on a pair of closely spaced buildings in response to near-fault forward-directivity and fling-step pulses. The soil-buildings system is simplified into a discrete spring-mass-dashpot model, and ground motions are simulated using simple mathematical pulses, which enables a wide range of parameters defining the physical system and the input pulses to be covered. Displacement spectra with and without impacting are obtained using a dimensional analysis for comparison purposes. It is shown that near-fault pulses are highly possible to result in high colliding potentials of flexible-base buildings, especially those on very soft soils when subjected to fling-step pulses. It is concluded that impact amplifies displacement demands of smaller-sized buildings when fundamental frequencies of the buildings are relatively lower than pulse frequencies. On the other hand, impact amplifies displacement demands of larger-sized buildings while reducing those of smaller-sized buildings when fundamental frequencies of the buildings are relatively higher than pulse frequencies. Special attentions of collision issues should be paid to buildings that are expected to suffer moderate damage.



中文翻译:

相邻单自由度建筑物之间动态相互作用的量纲分析以向前方向性和跳跃阶跃脉冲

进行了一系列参数分析,以研究冲击和结构-土壤-结构相互作用对一对紧密间隔的建筑物的综合影响,以响应近断层前向性和甩步脉冲。土壤建筑系统被简化为一个离散的弹簧质量缓冲器模型,并使用简单的数学脉冲模拟地面运动,这使得定义物理系统和输入脉冲的参数范围很广。有和没有影响的位移谱是使用尺寸分析获得的,以进行比较。结果表明,近断层脉冲极有可能导致柔性基础建筑物的高碰撞潜力,尤其是那些在非常软的土壤上受到跳跃脉冲时。得出的结论是,当建筑物的基频相对低于脉冲频率时,冲击会放大较小尺寸建筑物的位移需求。另一方面,当建筑物的基频相对高于脉冲频率时,冲击放大了大型建筑物的位移需求,同时降低了小型建筑物的位移需求。对于预计会受到中度损坏的建筑物,应特别注意碰撞问题。

更新日期:2021-06-17
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