Abstract
The method that a slab covers ground surface above the foundation structures is suggested as a seismic retrofit method. The method makes it possible to reduce the term and the cost for retrofitting of the foundation structures by omitting excavation.
It is known that this method will be more effective for seismic retrofitting of the foundation structures in case a slab has piles which fixes itself. Although, we worry about the interaction effect that the closer piles fixing a slab were to a footing, the less the effect of seismic retrofit would be.
Therefore we practiced some experiments considering the relation of the lateral resistance due to a footing, soil, a slab, piles fixing a slab with centrifugal model test.
This paper says that these experimental results give that ground-surface-slab increases the lateral resistance force of footing, and piles fixing a ground-surface-slab decreases the lateral resistance of footing in proportion to the overlapping area under the influence of a footing and piles.
