A 3D Macroelement To Model the Seismic Behaviour of Shallow Foundations

Abstract eng:
In this article, a 3D macroelement to model the seismic behaviour of shallow foundations is formulated, taking into account the non-linearities in the soil and the soil-foundation interface. The main idea of a macroelement is to describe the foundation behaviour using generalized variables (forces and displacements), defined in particular points of the foundation. The forces and displacements at these points are linked by elastoplastic constitutive laws. The non linearities are studied according to the classical plasticity theory, and the multisurface plasticity theory is used to combine the different mechanisms (punching, overturning, and sliding). This macroelement is implemented in the framework of the finite element method (CESAR-LCPC). This macroelement permits to simulate the 3D behaviour of a rectangular foundation subjected to complex seismic excitations, and to assess the effects of the limits imposed by the current standards. The time variation of the safety factor during the seismic event is highlighted, as well as the effect of the non linearities on the design demand.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket