Experimental Study And Finite Element Analysis Of T-shaped Concrete-filled Composite Steel Tubular Columns

Special-shaped(T-shaped, L-shaped,+-shaped) concrete-filled steel tubular columns which can avoid the appearance of edge angles in the room and make good use of architectural space have the advantages of high capacity,excellent seismic performance and convenience of construction which belong to ordinary. concrete-filled steel tubular columns at the same time, so it have better application prospects and attract more and more scholars all over the world. However, the current studies on special-shaped concrete-filled steel tubular columns are only limited in the field of mechanical behavior and rare in the field of seismic performance. On the basis of the Project of Construction Scientific Research of Wuhan City in 2008 (project number:40) and the Project of Construction Science and Technology Research (Development) of Hubei Province in 2008 (project number:44), improved T-shaped concrete-filled steel tubular columns have been proposed, and experimental study and finite element analysis on the earthquake resistant capability of six T-shaped concrete-filled steel tubular columns. The results of the research will provide reference for Technical Specification for Structures with Special-shaped Concrete-filled Steel Tubular Members, at the same time, it has important practical significance to the further application of concrete-filled steel tubular structure.This paper mainly includes the following aspects:(1) On the basis of reading extensive literature and field research, improved T-shaped concrete-filled steel tubular columns have been proposed and 6 components have been designed, the experiment on earthquake resistant capability has been carried out under low cycle repeated load, the experimental results have been analyzed in detail.(2)The large-scale finite element software ABAQUS has been used in the simulation of earthquake resistant capability of 6 T-shaped concrete-filled steel tubular columns, the results of simulation have been compared with the results of experiment in detail.(3) The orthogonal table including 4 factors and 3 levels has been designed according to the principle of orthogonal test analysis methods, The degree of impacts of 4 factors (ratio of axial compression stress to strength, concrete strength, thickness of steel tube and cross-section type) on the ultimate bearing capacity and earthquake resistant capability have been studied, the influence of index caused by the change of factor's level has been explored.