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[SaurabhPurandare at co...]

Dear all,

Currently I am involved in an europe based project as "precast design engineer". The 7 storied building is 15m wide and 45m long. The building has lot of 200mm thick shear walls in shorter direction spaced at 3.75m / 7.5m c/c and a very few walls along longer direction (that too only at the centre). All these precast shear walls are braced (in plan) using projecting rebars from top of walls bent in to the 75mm structural screed (with reinforcing mesh) on top of 150mm deep precast prestressed slabs.

Clearly, the stability of structure is in question in longer direction if shorter direction walls (braced in plan) are not taken in to account. If, the building is modelled using FEM in any suitable software, the contribution of the walls in short direction (because of it's geometric positioning & the fact that it is braced in plan by structural screed at every floor level) is huge & stability is not a problem in longer direction.

Now my problem is, the main consultant on the project is not comfortable checking the FEM model (yes, it happens in Europe as well). How can this be proved using only hand calculations? Can anyone refer me a literature or so for the same?

Regards,
Saurabh Purandare
Senior Design Engineer
Concast Precast Group
Newcastle, Hazelhatch,
Co. Dublin, Ireland.

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