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Large Deflection Under Eccentric Seismic Loading

Large Deflection Under Eccentric Seismic Loading

Large Deflection Under Eccentric Seismic Loading

(OP)
Hey all,

I currently modelling a low braced frame structure in ETABS with simply supported beams and steel decking.  Under seismic loading in the x and y directions, the building behaves as expected, with reasonable deflections.  However, when I look at deflections in either direction with eccentricity of 10% I get wild deflections (1m or more) in strange locations around the outside of the structure.  The rest of the structure behaves as you would expect; slightly larger deflections overall caused by the eccentricity.  

Has anyone experienced similar problems and worked out a solution?

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