Abstract
The mechanical performance of a new proposed type of cross-shaped connection with concrete-filled steel tubular (CFST) column and assembled steel H-beam was investigated. Cyclic loading tests on the cross-shaped connections are carried out by using MTS servo loading system. Comparative analyses are conducted based on the experimental results including hysteretic curves, skeleton curves and stiffness degradation curves as well as ductility coefficients of cyclic loading tests. Furthermore, effects of geometric parameters of ring-stiffened plate, axial compression ratio and backing plate on the deformation performance of cross-shaped connections are analyzed. The results show that the increase of width of ring plate and the shape change of ring plate from square to circle can both significantly improve the ductility and the hysteretic characteristics of connection. It is emphasized that the specimen with square ring plates is of better deformation performance but lower bearing capacity than the ones with circular ring plates. Besides, the backing plates always have positive effects on the hysteretic characteristics, ductility and energy dissipation of the CFST column connections. Conversely, the increase of axial compression ratio contributes negatively to both the bearing capacity and deformation performance of the connection specimens. It can be concluded that the presented cross-shaped connection is of good deformation performance relating to hysteretic characteristics, energy dissipation and ductility, which can provide reference towards engineering practice with potential perspective application.
Highlights
In the last thirty years, concrete-filled steel tubular (CFST) columns were widely employed as compression members in high-rise building, long-span bridge and underground structures due to the advantages of good performance, construction convenience and fine fire resistance as well as lower construction cost [1, 2]
It is wellknown that concrete-filled steel tubular columns increase the strength and the stiffness of the section by confining the concrete panel in the steel tube
The increase of axial compression ratio has negative effects on the bearing capacity and deformation performance of the connection specimens in accordance with what is displayed in the hysteretic curves above
Summary
In the last thirty years, concrete-filled steel tubular (CFST) columns were widely employed as compression members in high-rise building, long-span bridge and underground structures due to the advantages of good performance, construction convenience and fine fire resistance as well as lower construction cost [1, 2]. As an effective experimental measure, cyclic loading tests are adopted by most researchers. The main purposes of this work are to propose and design a new type of cross-shaped connection with CFST column and assembled steel H-beam and to carry out cyclic loading tests by using MTS servo loading system. Mechanical Performance of CFST Column to Assembled Steel H-Beam Connections The Open Mechanical Engineering Journal, 2014, Volume 8 271 conducted to discuss the effects of geometric parameters of ring-stiffened plate, axial compression ratio and backing plate on the deformation performance of cross-shaped connections. All H-beams of connection specimens were attached to CFST column stubs by high strength steel bolts as cantilevers
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