Foundation design for uplift during construvtion period

[killi]

I'm a Norwegian structural engineer working in Norway, and have run into a "we have always done it this way" theme.

The building is a regular single storey steel column and lattice truss design. Truss span is 25m, 75'. Soil is rock fill. Uplift in the order of 100kN per pad foundation.

I have insisted on making all pad foundations sufficiently heavy to resist uplift during the construction period, prior to the concrete floor slab (300mm, 1', thick) being cast, the customer quotes common practice locally which seems to ignore the effects of uplift during construction.

Two questions:
1) Does anyone know of a clever and contractor friendly method to constrain the bnuilding during construction?
2) Are there any dramatic pictures of building foundations lifted out of the ground by uplift? These to show the customer who is a major local contractor.

Thanks,
Dag Alan Killi

 

[BSE05]

Killi

I don't think there is an economical way to anchor the structure before the slab is placed (see my previous post). Until recently myself and other engineers I know never designed for wind uplift at the footing level. (NE US)

Damage to the structure from high winds during construction would be covered under the Builders Risk Insurance. So if there is concern make sure such a policy is in place.

Good Luck