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Published in:
2022 | OriginalPaper | Chapter
Critical Acceleration of Shallow Strip Foundations
Authors : Orazio Casablanca, Giovanni Biondi, Ernesto Cascone
Publisher: Springer International Publishing
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Abstract
This paper focuses on the assessment of the critical acceleration of soil-foundation systems and examines the influences of various relevant parameters. Using a formula recently proposed for the evaluation of the bearing capacity of shallow strip foundations in seismic conditions, the critical acceleration of the soil-foundation system has been evaluated imposing the equilibrium condition between the limit load of the soil-foundation system and load transmitted from the foundation onto the ground surface. The proposed solution led to an iterative equation that permits the numerical evaluation of the critical acceleration.
An extensive parametric analysis allowed to examine the effects of many relevant parameters, such as the angle of shear strength of the foundation soil, the value of the surcharge acting aside the footing, the static vertical load transmitted by the foundation, the direction of the resultant of the inertial forces acting in the soil and in the superstructure.
The results obtained are provided in design charts for given sets of the relevant parameters and allow a quick evaluation of the critical acceleration of the soil-foundation system.