Nonlinear Finite Element Analysis of High Strength Lightweight Concrete Beams

Abstract

This research work presents a nonlinear finite element investigation on thebehavior of lightweight reinforced concrete beams. This investigation is carriedout in order to get a better understanding of their behavior throughout the entireloading history.The three-dimensional 20-node brick elements are used to model theconcrete, while the reinforcing bars are modeled as axial members embeddedwithin the concrete brick elements. The compressive behavior of concrete issimulated by an elastic-plastic work-hardening model followed by a perfectlyplastic response, which terminated at the onset of crushing. In tension, a fixedsmeared crack model has been used .The effect of some important parameters(ƒ'c , rw ,a/d) have been investigated to study their influence on the predicted loaddeflectioncurves