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Horizontally curved beam under uniform moment

Hello everyone

I am modelling a horizontally curved steel beam under uniform moment. I can tell the beam is under uniform moment because the S11 stress is uniform along the beam. The problem is that the lateral and torsional deflections are very low. For instante, if I apply the critical moment to the beam it only deflects 20 cm (lateral deflection) and I expected larger deformations when the beam buckles. 

Fyi the beam's radio of curvature is 50 m, the curve is 20 m long and I turned the NLGEOM option on. Could anyone please tell me why my model doesn't give larger deflection results?

Thank you all very much.

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