Experimental Investigation of the Shear Resistance of Circular Concrete-Filled Steel Tubes (CFTs) Subjected to Transverse Loading

Abstract

Concrete-filled steel tubes (CFTs) and reinforced concrete-filled steel tubes (RCFTs) are used throughout the world in building and transportation structures. While the axial and flexural properties of CFTs have been well-researched, little research has been performed on their shear strength and behavior. Currently accepted methods for calculating their shear capacity significantly underestimate the effectiveness of the composite section, potentially increasing undesirable conservatism and cost. The purpose of this research was to investigate the shear resistance and deformation of CFT and RCFT members subjected to large shear stresses, and to develop an improved, more accurate method for their prediction. To do so, an experimental study of large-scale CFTs subjected to transverse shear load was undertaken, and high-resolution finite element models will be employed to extend the experimental results. The experimental and analytical results will then be combined to recommend office-ready design expressions for shear resistance, stiffness, and deformation capacity.