This research conducted a uplift capacity test through model test and
field test, targeting pipe buried and strip foundations, which are the
foundation of single-span greenhouse. Through this, the researcher
intended to provide basic material which can be the supplementation in
the structural stability of single-span greenhouse which is affected by the
external influence, e.g. climate damage, etc.
In the model ground test, this research utilized the soil of farmland and
reclaimed-land, which have different ground characteristic. In respect of
compaction rate of soil, uplift model test was conducted according to
65%, 75%, 85%, and in respect of embedment depth of pipe foundation is,
according to each condition of 30cm, 40cm, 50cm. And conducted field
test in respect of pipe strip foundation.
Load-displacement relation was regular, and had no change in respect
of displacement quantity in farmland and reclaimed-land soil, in case of
pipe buried foundation. In respect of pipe strip foundation,
load-displacement relation showed a slow curved shape.
As the result of comparing the result value of compaction rate 85%,
similar to field compaction, pipe buried foundation displayed farmland and
reclaimed-land soil 60.7kgf and 72.8kgf each, when compaction rate 85%,
and embedment depth 50cm, also, pipe strip foundation appeared to
exceed 450.0kgf, the maximum measured value in two soils. Therefore,
the ultimate uplift capacity of pipe buried foundation and pipe strip
foundation showed difference by 7.4 times in farmland soil, and 6.2 times
in reclaimed-land soil, also, it was determined that structural stability
would be much lower than pipe strip foundation.
In respect of field test, the researcher tested per steel wire clamp, steel
plate clamp, and U-clamp, by burying dori part by 25cm depth with the
compaction rate 85%, similar to the compaction condition around general
greenhouse. As the result, 18.6kgf, 160.0kgf, 330.0kgf appeared in order
of steel wire clamp, steel plate clamp, and U-clamp, and considerable
difference in uplift capacity appeared according to combined aperture.
Uplift capacity of U-clamp was about 2 times compared to 141.8kgf,
single-span greenhouse disaster tolerance type design standard of steel
plate clamp, which is mainly used, in case of constructing by combining
U-clamp in pipe strip foundation of single-span greenhouse, weather load
recurrence interval and durable years are expected to increase by about
2 times, also, estimated to create profit of 13,176,065 won financially,
accordingly, structural stability can be largely secured.