National Natural Science Foundation of China(51278072), Key Discipline Foundation of Civil Engineering for Changsha University of Science and Technology(16ZDXK09).
Using initial parameter solutions and transfer matrix method, the finite element formulation for restrained torsion of a thin-walled box girder was presented. The equivalent nodal forces of distributing torque and bimoment acted on an element were also derived. Based on the displacement solutions of the finite element method for restrained torsion, a new algorithm for calculating the flexural-torsional moment was developed. The relevant stiffness matrix and fixed-end forces for distributing torque and bimoment acted on the element were establis...
