The New Analytical Theory of Restrained Torsion of Thick-Walled Concrete Box Girder Bridge

Directed toward the feature of restrained torsion of concrete box girder bridge, the layered approach of analyzing restrained torsion is put forward, displacement model and geometric equation are established by using the generalized coordinates principle, and the formula of restrained torsion shear stress is derived, and then a analytical theory of restrained torsion of thick-walled box girder is established based on the mixed variational principle. The numerical experiment indicate that it cannot be neglected that thick-walled effect of restrained torsion of concrete box girder bridge and the predicted results by the new theory are accurate.