Implementation of the bond-slip effect in the non-linear analysis of composite beams

Abstract

This thesis deals with the integration of a non-linear finite element analysis method and a bond-slip model of a partially composite beam. In the proposed bond-slip model, the governing equation of the composite beams is derived based on a linear partial interaction theory and is solved by applying boundary conditions at the two ends of the beam with compatibility conditions. It is possible to perform structural analyses that are more efficient by means of implementing this bond-slip model in the FEM code, as the results of a general structural analysis are necessary to perform the bond-slip analysis. By implementing the bond-slip model in the code, these two processes are connected to each other directly. Moreover, complicated modeling processes such as the insertion of double nodes are simplified through the use of typical beam elements which have 2 degree of freedom for a node. Initially, for the verification of the integrated analysis system, numerical results by the integrated analysis system for steel-concrete composite beams are compared with the analytic results of the existing study. The main characteristics of the bond-slip behavior are shown to be suitably reflected in the results. Secondly, numerical results by the integrated analysis system are compared with the experimental results for the various concrete composite beams with different material properties and sizes. These structural analysis results, considering bond-slip effect, showed good consistency with experimental data. Through these comparisons, the validity of the integrated analysis system is established.