Quote Originally Posted by papi smith View Post
Question lang mga CE tsikoteers sirs...

A 2 storey house with firewall on 1 side hence the columns are eccentric, if the 2nd floor slab is 4.8M from the footing, do I need a strap/tie beam in addition to the ground floor beam/wall footing?

My architect says we don't need anymore so that I can save money he says, but I am not comfy.

The plan has a drawing of a tie beam but the structural analysis he says does not provide for one. The plan drawings were done by another architect and the struct analysis was done by a CE and also revised the steel requirement from 8pcs 16mm/column to 8pcs 20mm/column. Isn't this an overdesign? The steel diff alone is worth another 300k.
Structural design is relative to loads & stresses: axial, lateral, dead, eccentric, torsional, shear, moment & so on. Soil bearing capacity, distance between columns, their sizes & respective tributary loads must also be factored in.
That said, the best guy to ask this simple & specific concern would be the building's structural designer. He should be most familiar w/ his design criteria & assumptions.
Generally, shortening a column's unsupported length, provides more stability & adds to the area's safety factor.

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