Study on Galvanizing Cracks on Scallap of Steel Column Connection Joints

Abstract

The hot dip galvanizing for corrosion protection is often uesd for structural steel architecture in recent years. However, it is estimated to occur galvanizing crack at a intersection of many welding lines in column connection joints. In this study, galvanizing tests with partial column joint models and hot elasto-plastic FEM analysis were carried out in order to clarify mechanism of galvanizing crack. As a result, a dip speed is not so relative to galvanizing crack, neither is a presence of backing metal. It became also obvious that the higher a thickness ratio is, the higher a stress at the scallap is. We, furthermore, propose to reduce a thickness ratio and to put a hole in order to prevent galvanizing crack.