Three Dimensional (3D) Finite Element Analysis of Reinforced Concrete Structures based on Continuum Mechanics

  • Hartl, Helmut, (Principal Investigator (PI))

Project: Research area

Description

A 3D (three-dimensional) finite element program is developed for reinforced and prestressed concrete structures. It allows the engineer to perform the nonlinear analysis with reasonable effort. The reinforcement can be retrieved from detailing and is embedded automatically into the parent elements. An embedded approach allowing consideration of slip between the rebar and the parent concrete is presented by introducing slip degrees of freedom to the parent elements. Thus, prestress can be applied directly to the rebars. The classical embedded approach introduces no additional degree of freedom and is therefore restricted to perfect bond on the global level. However, slip situations can be accounted for at the material level. Slip situations along the entire rebar can be modeled by introducing supplementary interface elements at the material level, after computation of the displacement field. Slip situations arising from any kind of prestress can be accounted for. Concrete is modeled in terms of plasticity, employing the Ottosen failure criterion. Several rotating crack models based on the cohesive crack concept are available for tensile failure. Creep is accounted for by integrating the entire stress history. Finally, the potential of the program is demonstrated by means of solving individual examples in structural engineering and for situations of soil structure interaction. The developed program is an extension of BEFE, which was developed by Gernot Beer.
StatusFinished
Effective start/end date1/10/9731/01/15