ANALYTICAL STUDY ON STRENGTH AND DUCTILITY OF STIFFENED BOX-SECTIONAL STEEL BRIDGE PIERS MADE OF SM570 MATERIAL

Abstract

 The present study is aimed at investigating effects of various structural parameters on the strength and ductility of bridge piers made of high strength steel SM570 material. Main parameters considered are flange plate with-thickness ratio, column slenderness ratio and axial force ratio. For this purpose, an elasto-plastic cyclic analysis is carried out, and the modified two-surface model is employed. Based on the analytical results, discussions are focused on if it is possible for steel piers made of SM570 material to apply some of existing formulas for determining the strength and ductility of steel piers made of SM490 material. As a result, new formulas are proposed with good accuracy for determining the strength and ductility of steel piers made of SM570 material.