Mixed finite element for modelling interfaces

Abstract

A special finite element based on Reissner’s mixed variational principle has been presented to model interface between two materials. The present element is a 7-node two dimensional mixed finite element with 5 displacement nodes and 2 stress nodes. The mixed interface finite element ensures the continuity of stress and displacement vectors at the interface on the coherent part and the discontinuity of this one on the cracked part. This element has been formulated starting from a parent element in a natural plane with an aim of modelling different types of interfaces with various orientations. This work is essentially devoted to the formulation of the interface element and the study of convergence and validation of this element. Results obtained from the present mixed interface element have been shown to be in good agreement with the analytical solutions.

Research on Mechanical Characteristics and Load-bearing Behavior of Nodes of Steel Fiber Concrete Arch Bridges

“…The main bridge is a calculated span L = 115 m under-bearing steel pipe concrete tied arch bridge, the arch rib is made of dumbbell type steel pipe concrete structure, the boom is made of steel stranded whole bundle extruded finished cable, the tied beam, end crossbeam, and middle crossbeam are made of prestressed concrete structure, the wind brace is made of empty steel pipe structure, the vehicle load class is highway-I, the steel is made of Q345D steel. After the full bridge model was established by finite element software, the internal force at the location of the arch ribs of the arch foot was extracted and the finite element model was established [28].…”