As quoted by DJ Paul axial displacements should not create problem.

The load cases you have mentioned (L10, L11, L12, L13) has been considered as expansion stresses. You shall not consider it also as a occational case. Furthur as you have mentioned the displacemention form +225 to -225 the worst expansion stress range also needed to be considerd which is T1+D1+D2 (Consider as a non linear case).