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Abstract
The chapter presents experiments on new joints of concrete-filled steel tubes (CFSTs). An experimental study on the ultimate strength of gusset-plate joints of hollow steel tubes (HST) and concrete-filled steel tubes is carried out on 12 specimens. The joints of steel tubes with and without concrete infill are compared in the chapter. The static test results indicate that the load on gusset plate can be transferred to concrete composite column members, as long as the strength of the welding that connected the gusset plate and the steel tube is enough. The bearing capacity and local buckling performances of the CFST joints with gusset plate are much better than that of hollow steel tubes. This type of a CFST joint can be used in composite truss systems and be more convenience than traditional connections.
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