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Modified Pseudo-dynamic Bearing Capacity of Shallow Strip Footing Considering Fully Log-Spiral Passive Zone with Global Center
Iranian Journal of Science and Technology, Transactions of Civil Engineering ( IF 1.7 ) Pub Date : 2019-06-03 , DOI: 10.1007/s40996-019-00271-1
Arijit Saha , Sima Ghosh

The subject seismic bearing capacity is one of the most important aspects of geotechnical earthquake engineering. As the existing pseudo-dynamic method has certain drawbacks, this paper presents a modified pseudo-dynamic approach to evaluate the seismic bearing capacity of shallow strip footing resting on c– Φ soil considering the log-spiral failure mechanism. Since damping is present in all materials, more realistic results can be obtained by modeling the soil as a visco-elastic material. Here, the passive failure region is considered a fully log-spiral zone with an arbitrary location of the center of log-spiral. A single seismic bearing capacity coefficient ( N γ e ) is evaluated for the simultaneous resistance of unit weight, surcharge and cohesion, which is more practical to simulate the field failure mechanism. The effects of soil and seismic parameters are taken into account to evaluate the seismic bearing capacity of the foundation. The results obtained from the present analysis are presented in both tabular and graphical non-dimensional form. Results are thoroughly compared with the existing values in the literature, and a reasonably good agreement is found with the existing studies.

中文翻译:

考虑全球中心全对数螺旋被动区的浅条形基础修正拟动力承载力

主体抗震承载力是岩土地震工程最重要的方面之一。由于现有的拟动力法存在一定的缺陷,本文提出了一种改进的拟动力法,用于考虑对数螺旋破坏机制的c-Φ土浅条形基础的抗震承载力评价。由于阻尼存在于所有材料中,因此可以通过将土壤建模为粘弹性材料来获得更真实的结果。在这里,被动失效区域被认为是一个完全对数螺旋区,其中心位置在对数螺旋中心的任意位置。单次抗震承载力系数(N γ e )用于同时计算单位重量、超载和黏聚力的抗力,更适合模拟现场破坏机制。综合考虑土体和地震参数的影响来评价地基的抗震承载力。从本分析中获得的结果以表格和图形无量纲形式呈现。结果与文献中的现有值进行了彻底的比较,并且发现与现有研究具有相当好的一致性。
更新日期:2019-06-03
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