CONCRETE-FILLED HIGH-STRENGTH STEEL BOX COLUMNS FOR TALL BUILDINGS - BEHAVIOR AND DESIGN

This paper presents a study of the behaviour and design of concrete fi lled high strength steel fabricated box columns for use in tall buildi ngs. The many advantages that can be attributed to the use of high str ength steel in concrete filled steel box column constructions are pres ented and discussed. The paper deals with short composite columns and presents guidelines for plate slenderness and overall column slenderne ss to eliminate local and overall buckling. A proposed design model is developed to calculate the strength of short columns in bending and c ompression. A method for constructing the strength interaction diagram is presented. Furthermore, to study the ductility of this form of col umn construction a cross-sectional analysis computer program was devel oped to consider the moment-thrust-curvature response of such members. This has been undertaken using mild structural steel and high strengt h steel. The study also shows that, by the use of the method considere d, savings can be made in the base column design of a tall building wi th a negligible penalty in ductility. Finally, recommendations are giv en for further research into this new method of column construction, w hich focuses on future experimental work.