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European Consultants working in Pakistan are using British and European Codes & Specifications for world bank funded projects. Indeed, there are projects usin both ACI & Eurocodes at the same time! India and Bangladesh and many other developing countries have their own structural codes - Pakistan does not sadly.... we like all things American it seems. Most Pakistan Engineers are using outdated American Codes int heir - as buying revised codes every few years is expensive - also working to imperial units (feets, kips, inches etc), rather than metric units (KN, mm, m). It is unlawful in the countries where the codes originate from to use "out-of-date" Codes! PEC - the authorising Engineering body - offers no advise, not does the Pakistan Housing Ministry! Check out this page of pase.pk website, where I have tried to offer some information on codes: pase.pk - codes Best to check and agree first with your Client on acceptable Codes and Specification documents to use on the project!

W.Salaam, For Dual Systems, frames of dual system are required to resist at-least 25% of the total base shear. This ensures that system has sufficient redundancy to justify the higher R value associated/ used with Dual Systems. There are different way to do it. You can make a copy of your model (or do save as; whichever is more convenient). Assign stiffness modifiers to walls so that they would be taking gravity load only and analyse your model for 25% of total base shear. They other way would be to remove wall panels and just leave the boundary elements and analyse your model. Thanks.