Seismic behavior of specially shaped concrete‐filled steel tube columns with multiple cavities

Abstract

Summary To study the seismic behavior of specially shaped concrete‐filled tube (CFT) columns with multiple cavities under axial tension or axial compression, a quasistatic test of four 1/30‐scale specially shaped CFT columns with multiple cavities was conducted based on the CFT mega columns in a super‐high‐rise building. The main parameters of the 4 specimens were the direction of axial force, the direction of horizontal force, and the cross‐sectional structural form. The test was conducted twice at each level of horizontal displacement. The results shows that the compression–flexure test specimen showed lower yield damage, higher bearing capacity, and superior seismic performance relative to the tension–flexure test specimen; the specimen loaded along the short axis of the section had a lower bearing capacity and stiffness relative to the specimen loaded along the long axis; and the corner‐reinforced specimen with a round steel pipe was found to be rationally designed and properly constructed. Finally, an N–M correlation curve was generated and found to show satisfactory agreement between the fitted values and the test values.

Seismic behavior and damage assessment of concrete‐filled steel tube columns in diagrid structures

“…Concrete‐filled steel tubes (CFSTs) have been widely used as inclined columns of diagrid structures because of their high axial carrying capacity and economic benefits. In recent decades, many efforts have been made to study the mechanical behavior of CFST columns, such as by Han et al, [ 5 ] Wang et al, [ 6 ] Perea et al, [ 7 ] Abed et al, [ 8 ] and Evirgen et al [ 9 ] Nevertheless, previous studies have mainly focused on the static behavior under axial compression, [ 7–13 ] axial tension, [ 14,15 ] and combined compression and bending, [ 16–18 ] as well as the seismic behavior under lateral cyclic loading, [ 19–23 ] which all apply to the vertical load‐bearing members of conventional structures. In contrast, the mechanical behavior and seismic responses of CFST columns subjected to axial cyclic loading in diagrid structures are significantly different from those of bending members, but research on the seismic behavior of inclined CFST columns is lacking.…”

A Numerical Comparison between Spiral Transverse RC and CFST Columns under Loads of Varying Eccentricities

“…Sakino et al [32] presented stress-strain relationships for concrete of the CFST columns under the axial loads through an experimental investigation. The eccentric compressive loads are also induced in the columns during the earthquake [33]. In an experimental research, Xiong et al [34] evaluated the bearing capacity of the CFST columns under eccentric loads.…”

Full‐scale experimental assessment of new connection for columns in vertically mixed structures

“…The proper connection of different frames transferring tensile, compressive, and shear forces and the bending moment to the lower RC column is of great importance. The innovative aspect of this study is the assumption interconnected concrete‐filled steel tube columns on the transition story. Methods of stress transfer between steel and concrete in composite steel–concrete construction elements often involve either a shear connector or a through bolt .…”