Finite element modeling of bolted connections between coldformed steel strips and hot rolled steel plates under static shear loading

摘要

A finite element model with three-dimensional solid elements is established to investigate the structural performance of bolted connections between cold-formed steel strips and hot rolled steel plates udner shear. Non-linear material, geometrical and contact analysis is carried out to predict the load-extension curves of typical bolted connections with cold-formed steel strips of high yield strength and low ductility. The failure mode of interest in the present investigation in the bearing failure of cold-formed steel strip around bolt holes; a full description of the finite element modle is presented. Based on test data, a steel-strain curve for the cold-formed steel strip ois proposed which allows the cold-formed steel strip to yield and degrade in strength at large strain. The load-extension curves of four sets of test specimens were successfully preidicted up to an extension of 3 mm. The predicted bearing resistance and the extensional stiffness of the bolted connections compare well with test data.