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Force vs Pressure loading

Force vs Pressure loading

Force vs Pressure loading

(OP)
I have a long column like 2D model with contact element at the bottom and force loading at the top surface....now i am observing a confusing result.......when i apply a point load at the middle of the top surface with constrained nodal displacement for all nodes on that surface, i get a reasonable answer.....but when i change it to a distributed pressure loading, i get very high deformation that is not acceptable....can anybody point out to me why this is happening?

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