The Study Of Long Steel Tubular Column Filled With Steel-reinforced Concrete Under Eccentric Compressive Loading

With the increase of span-length, height and the requirement for anti-seismic performance, the design of frame-column has become a research focus in structural design. Being a new type of column, steel tubular column filled with steel-reinforced concrete will be widely used in high-rise buildings, owning to the high strength, good ductility, better seismic behavior, and convenient construction. Based on all the research results on this type of column, this thesis has done some researches on long compression column under eccentric compressive loading. The main contents are as follows:The history and actuality of research on Steel-Composite Columns are reviewed, especially those study results on the bearing capacity of Steel tubular column filled with steel-reinforced concrete obtained before are presented in this thesis.The experiments of long composite columns under eccentric compressive loading are conducted to study the behaviour of columns. An axial force-moment curve is obtained, then it is verified with the experimental results. Then, the finite element software ANSYS is used to calculate the ultimate bearing capacity of the composite columns under eccentric compressive loading. Compared with the experimental results, the result obtained from ANSYS is proved to be useful.This thesis summarizes two methods considering non-standard columns. A formula for the bearing capacity calculation of non-standard steel tubular column filled with steel-reinforced concrete column is carried out using the equivalent moment method. And it is proved that the inequality moments caused by the error of experiments need not to be considered as a non-standard column.Numerical analysis method is used to obtain the moment-curvature curves and the moment-axial force curves. An example is calculated using this numerical analysis method, verifying that this numerical analysis method is useful and efficient.