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Re: ETABS/ Dual System

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One way that works with all programs is to use different sets of materials for walls and columns and set the stiffness of walls equal to zero (by reducing E to 0.01 or something). Then all the loads are reduced to one fourth (includind self weight by reducing density).
If the system is working with these parameters, we have a dual system.

----- Original Message -----
Sent: Saturday, September 09, 2006 10:12 AM
Subject: ETABS/ Dual System

1. Is there any one here can explain to me how to check SMRF Elements in dual structural system that it can resist at least 25% of the design base shear (per UBC 1997) using ETABS?
2. How do you scale up dynamic base shear?... I just found out 2 methods in ETABS and both have different results. In your practice, how it is done?

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