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Abstract:Sign structures in Wisconsin are typically supported by drilled shaft foundations or spread
footing foundations. However, when the soil conditions are not suitable to be supported on
drilled shafts or spread footings, a group of piles could support the foundation. Large sign
structures are subject to large lateral wind loads, which result in large lateral forces and overturning
moments. These lateral forces and overturning moments produce both uplift loads and downward
loads on the pile foundation. However, published methods for designing driven pile groups only
address groups subjected either to compression or uplift, not both simultaneously. This research
project investigated the behavior of the group of piles under both compression and uplift loads.
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