STUDY ON MECHANICAL PROPERTIES OF MULTI-CELL T-SHAPED CONCRETE FILLED STEEL TUBES SUBJECTED TO PURE BENDING

4 multi-cell T-shaped concrete-filled steel tubes (MT-CFST) and 2 multi-cell T-shaped steel tubes (MT-ST) subjected to pure bending were tested. The failure modes and the effects of cross-section dimensions and loading position on pure bending behaviors of MT-CFST specimens were examined as well. It was found in the experiment that the flexural capacities of MT-CFST specimens can be significantly enhanced by increasing the web height. The loading capacity was different when the force acted on the flange or the Web. Failure modes were mainly overall bending. Subsequently the finite element method is used to calculate the moment-deflection relationships of the MT-CFST specimens. The calculated curves show good agreement with the presented test results. Based on the parametric analysis, a simplified formula for calculating the ultimate strength of the new type of composite members under pure bending is recommended in the end.