Finite Element Model for RHS Double Chord K‐Joints

Abstract

A finite element elastic‐plastic model for separated double chord gap K‐joints of steel rectangular hollow sections (RHS), is presented. The model treats a single chord member as composed of a plate representing the inner web and a channel depicting the top and bottom flanges and the outer web, respectively. Triangular and rectangular flat shell elements are used to discretize the inner web plate, whereas plane stress elements are employed for the branch members. The channel consists of a grillage of beam elements. The analysis extends beyond the elastic limit and accounts for strain hardening and material nonlinearity. A comparison of theoretical predictions with the experimental results of 12 K‐joint specimens of a previous study shows fair agreement.