Lift slab structures instability during construction
Abstract: Lift slab structures are built in a method, which makes them inherently vulnerable
to static and dynamic instability during the construction stages. The columns
cannot be laterally braced in the areas, where temporarily anchored slabs are to be
lifted to higher levels, because the bracing will make the lifting process of the slabs
to higher level impossible. Thus the columns will stay long and slender above the
anchored slabs until the shear walls are built at the lower levels, This situation
requires the checking of the whole structure above the shear walls for its stability
against its own load. A formula was derived to help in checking the stability of such
structures, based on the number of slabs, anchored temporarily at different levels,
the distances between those anchored groups and the rigidity of the columns. A
computer program was written to enable the construction process envision the
critical situation which may cause instability.
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Permission to reproduce these documents have been graciously provided by the Aarhus School of Architecture, Denmark. The assistnace of the editor, Prof. Kristian Agger, is gratefully aprecciated.