A numerical study on the seismic bearing capacity of shallow foundations |
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| Authors: | Vincenzo Pane Alessia Vecchietti Manuela Cecconi |
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| Institution: | 1.Department of Engineering,University of Perugia,Perugia,Italy;2.Department of Civil and Mechanical Engineering,University of Cassino and Southern Lazio,Cassino,Italy;3.Department of Engineering,University of Perugia,Perugia,Italy |
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| Abstract: | Based on a pseudo-static approach, finite difference (FDM) numerical analyses have been performed aimed at evaluating the seismic effects on the ultimate bearing capacity of shallow strip foundations. In the specialised literature, such seismic effects are usually divided in two components, namely, a structure inertia and a soil inertia, which can be either considered together, or separately addressed and then superposed. Both of these inertia effects are investigated in this work. The results of a comprehensive numerical study are presented in—and critically compared to—the wide framework of available analytical solutions proposed in the literature in the last 30 years. The good agreement found between the numerical and the analytical approaches is pointed out, thus providing further evidence of the reliability of some available and widespread solutions. The possibility of superposition of the two inertia effects is investigated. It is found that in some cases the soil inertia may play a significant role in the seismic capacity of the system, and that simple one-constant equations can be readily used in foundation design to estimate the reduction in bearing capacity (namely, factors e i , e k ) deriving from the two inertia effects. |
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