Stress redistribution analysis of multi-girder structure during the whole course

Abstract:

In order to grasp the mechanism of the multi-girder structure during the whole course,the stress redistribution regularity is studied with shell element degraded from solid element.Steel and concrete are depicted by layered shell element and the prestressed steel is modeled by combined shell element.Then the stiffness matrix of contribution of the prestressed steel to the combined shell element is deduced.Respectively based on Owen yielding theory and Hinton crushing theory and bilinear model,the material nonlinear properties of concrete and steel are considered.Then the procession of cracking,yielding and failure of prestressed concrete multi-T girders is imitated and the analytical procedure is compiled.Through compared with the failure experiment results of a prestressed concrete multi-T girder bridge,the calculations are in good agreements with them.The regularity of stress redistribution of prestressed steel is studied.It shows that it is feasible to apply shell element degraded from solid element to depict the prestressed concrete multi-T girder bridge and the corresponding computational method and procedure for nonlinear whole-course analysis are correct and reliable.