港口能力受损基础的断裂:循环系统的实例
Rupture sismique des fondations par perte de capacité portante: Le cas des semelles circulaires
摘要:
在浅基础抗震设计的范围内,本研究涉及到位于非均匀纯粘性半无限土层表面上的圆形基础的地震承载力的确定。在论文的第一部分中,简要介绍了一个包含基础地震承载力失效的土木工程结构案例历史的数据库,旨在更好地理解所研究的现象,并提供一些对验证有用的案例研究理论计算。在本文的第二部分中,上述问题是解决使用的屈服设计理论的运动学方法,从而建立最佳上限的极限地震荷载所支持的土壤基础系统。结果导致建立一些非常简单的准则,扩展现有的公式中包含的地震承载力的欧洲规范(建议为条形基脚均匀土壤)的情况下,圆形基脚和非均质粘性土壤。
英文摘要:
Within the context of earthquake-resistant design of shallow foundations, the present study is concerned with the determination of the seismic bearing capacity of a circular footing resting on the surface of a heterogene-ous purely cohesive semi-infinite soil layer. In the first part of the paper, a database, containing case histories of civil engineering structures that sustained a foundation seismic bearing capacity failure, is briefly pre-sented, aiming at a better understanding of the studied phenomenon and offering a number of case studies useful for validation of theoretical computations. In the second part of the paper, the aforementioned problem is addressed using the kinematic approach of the Yield Design theory, thus establishing optimal upper bounds for the ultimate seismic loads supported by the soil-footing system. The results lead to the establishment of some very simple guidelines that extend the existing formulae for the seismic bearing capacity contained in the European norms (proposed for strip footings on homogeneous soils) to the case of circular footings and to that of heterogeneous cohesive soils.
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