The principal tensile stress check is introduced in order to verify the adequacy of webs of segmental concrete girder Bridges for longitudinal shear and torsion.

In order to resist the strong torsion stress associated with the support-less winding shape of the bridge, we activate structurally all the sides of its distorted volume.

In the design of axles bearing moment of torsion and bending, it is necessary reinforce stress of materials according to the real conditions of the enterprises.