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Influence of pore pressure on natural frequency wandering of structures under earthquake conditions
Soil Dynamics and Earthquake Engineering ( IF 4 ) Pub Date : 2020-12-23 , DOI: 10.1016/j.soildyn.2020.106534
Piotr Kowalczyk , Alessandro Gajo

Temporary seismic frequency wandering of buildings during and after seismic events has often been observed and has not yet been investigated, in particular with regards to the effects of the pore pressures generated within the soil mass. This paper investigates the influence of delayed soil response on the observed temporary natural frequency wandering induced by seismic actions. The focus is on the pore pressure generation within the soil mass and its impact on the observed wanderings. Our findings show that the natural frequency of the system is lower shortly after the seismic event, but it returns to its initial value with time, as expected from measurements. The results are shown in terms of generated pore pressure, its dissipation over time, reduced mean effective pressure and nonlinear stress strain behaviour, all of them affecting the temporary changes in natural frequencies. Parametric studies on the influence of soil permeability, soil density and type of input motion are presented. Finally, a time history inclusive of an aftershock is investigated to explore the different soil-structure interaction mechanisms occurring during the main event and the subsequent aftershocks.



中文翻译:

地震条件下孔隙压力对结构固有频率漂移的影响

人们经常观察到并且尚未进行建筑物在地震事件发生期间和之后的临时地震频率游荡,特别是关于土壤中产生的孔隙压力的影响。本文研究了延迟土壤响应对地震作用引起的观测到的固有自然频率漂移的影响。重点是土壤中孔隙压力的产生及其对观测到的游荡的影响。我们的发现表明,地震事件发生后不久,系统的固有频率会降低,但正如测量所预期的那样,它会随时间返回其初始值。结果显示为产生的孔隙压力,其随时间的消散,平均有效压力降低和非线性应力应变行为,所有这些都会影响自然频率的暂时变化。提出了对土壤渗透率,土壤密度和输入运动类型的影响的参数研究。最后,研究了包括余震在内的时程,以探讨在主要事件和随后的余震过程中发生的不同土壤-结构相互作用机制。

更新日期:2020-12-23
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