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Ultimate bearing capacity of rigid footing under eccentric vertical load

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Title: Ultimate bearing capacity of rigid footing under eccentric vertical load
Authors: Pham, Quang N Browse this author
Ohtsuka, Satoru Browse this author →KAKEN DB
Isobe, Koichi Browse this author →KAKEN DB
Fukumoto, Yutaka Browse this author →KAKEN DB
Hoshina, Takashi Browse this author
Keywords: Ultimate bearing capacity
Rigid footing
Eccentric load
Moment load
Issue Date: Dec-2019
Publisher: Elsevier
Journal Title: Soils and Foundations
Volume: 59
Issue: 6
Start Page: 1980
End Page: 1991
Publisher DOI: 10.1016/j.sandf.2019.09.004
Abstract: In geotechnical engineering, the stability of rigid footings under eccentric vertical loads is an important issue. This is because the number of superstructure buildings has increased and the situation of structures being subjected to eccentric vertical loading is occurring more and more frequently. In this study, focus is placed on the ultimate bearing capacity of a footing against the eccentric load placed on two types of soil, namely, sandy soil and clayey soil, using a finite element analysis. For the sandy soil, the study newly introduces an interface element into the footing-soil system in order to properly evaluate the interaction between the footing and the soil, which greatly affects the failure mechanism of the footing-soil system. For the clayey soil, the study improves the analysis procedure by introducing a zero-tension analysis into the footing-soil system. Two friction conditions between the footing and the soils are considered; one models a perfectly rough condition and the other models a perfectly smooth condition. For a two-dimensional analysis of the footing-soil system, the rigid plastic finite element method (RPFEM) is applied to calculate the ultimate bearing capacity of the eccentrically loaded footing. The RPFEM is extended in this work to calculate not only the ultimate bearing capacity, but also the distribution of contact stress along the footing base. The study thoroughly investigates the effect of the eccentric vertical load on the ultimate bearing capacity in the normalized form of V/Vult and ℯ/B where e is the length of the eccentricity and B is the width of the footing. Vult indicates the ultimate bearing capacity of the centric vertical load. The failure envelope in the plane of V/Vult and M/BVult is further investigated under various conditions for the sandy and clayey soils. M is the moment load induced by the eccentric vertical load. This study examines the applicability of the failure envelope obtained for the eccentric vertical load to the cases where two variables, V and M, are independently prescribed. The obtained results are coincident and indicate the wide applicability of the failure envelope in the normalized V-M plane in practice. Finally, in a comparison with previous researches, the numerical data in the present study lead to the derivation of new equations for the failure envelopes of both sandy and clayey soils.
Rights: © 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 磯部 公一

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