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In fact, a simple free-body diagram analysis would demonstrate that the currently assumed load introduction mechanism is not possible.
This paper presents the design implications of a new load introduction mechanism into concrete-filled steel tubular columns (CFST) proposed by the authors recently.
According to the new load introduction mechanism, the beam-column connection load is introduced into the composite column through the column length above and within the connection.
The most important implication of the new load introduction mechanism is that the concrete core above the connection should be designed to resist the additional compressive force introduced to the concrete core below the connection.
Under the new load introduction mechanism and using representative values of column dimensions and concrete cylinder strength, it has been demonstrated that complete load introduction can be achieved in almost all practical arrangements of concrete filled tubular construction.
Based on the new load introduction mechanism, for slender CFST column design, a "concrete strength reduction factor" should be used to account for incomplete load introduction, when calculating the CFST column cross-section flexural stiffness.
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