TESTS ON LOCAL COMPRESSION BEHAVIORS OF AXIALLY LOADEDCONCRETE-FILLED STEEL TUBES WITH END PLATES

The End plates of concrete_filled steel tubes (CFST) may influence its local compression behaviors. Therefore local compression behaviors of axially loaded CFST members with circular and square sections with end plates of different rigidity are studied experimentally. Section form and local compression area ratio are also examined. From the results, the local compression behaviors approach to the full section compression case as the rigidity increases. The difference of the section form and local compression area ratio can make the influence of the end plates different. Local compression bearing capacity calculation gets good result with finite element method (FEM),which gives an effective approach to further mechnisam analysis.