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Geometric Non linear Structures

Geometric Non linear Structures

(OP)
Hi Forum Members,

I am designing a large span portal and after applying loads the portal is deflecting a lot. Is there any guidelines in any International code or standard, which says about a limit (Deflection) beyond which it becomes non linear behavior. I am bit confuse on this concept and large deflections and rotations will also give rise to wind dynamic loading.

Please suggest

RE: Geometric Non linear Structures

The codes don't provide any absolute diaplacement limitation but focus in a drift approach.
In this way, the drifts are limited. Moreover, the story indeces are calculated as a ratio between first and second order moments. Structural codes consider linear behaviour if the story index falls within the limits they define.

Jason McKee
proud R&D Manager of
Cross Section Analysis & Design
Software for the structural design of cross sections
Moment Curvature Analysis
Reifnorcement Design etc.

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