Friction (Edit: and possibly the nose ribs too, see http://www.flight-mechanic.com/wp-content/uploads/2017/07/1-23.jpg). The wings move towards the plane as it penetrates and the wings don't, at least for as long as they remain connected to the plane (because the fuselage would pull them). That explains the inwards bowing of the steel columns.Why, if a wing was that strong, wouldn't it just wedge them apart?
[qimg]http://yankee451.com/wp-content/uploads/2012/07/animated-MIT-approach.gif[/qimg]
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