Evaluation And Numerical Research On Shear Ultimate Capacity Of Steel Reinforced Concrete Short Column

With the modern high-rise construction heading to the way of multi-function,long-span and large column-grid,Steel Reinforced Concrete(SRC)structure is widely used in real project.Since the 1990s,our country has accumulated a large amount of experimental data of SRC short column under low period repeated loading,which is of great importance on the study of the seismic performances of SRC short column.Therefore,it is necessary to make generalizations.And there is currently no unified formula in calculating the shear bearing capacity of SRC short column.What’s more,there is also limited numerical analysis of SRC short column.Therefore,it’s necessary to have further research.Based on the idea,this thesis summarizes the experimental data of SRC short column in nearly three decades and sorts out experimental data of 102 SRC short column through moment-curvature analysis and establishes short column experimental database.The influence parameters of sheer ultimate capacity for short column are studied and summarized in this thesis.It draws the conclusion that shear span ratio,concrete strength and axial compression ratio have the most dramatic effect on the shear bearing capacity and there is neglected effect of stirrup ratio on it.According to the characteristics of SRC short column tests,we can see that our country uses less double-curvature member and large cross-section of testing column.What’s more,high-strength stirrup and steel are rarely used in database.Meanwhile,full-sized and homemade H-section steel SRC short column are also rarely used in our country.The calculating methods of SRC column of China,America and Japan are compared in this thesis based on the experimental database.For the use of high-strength stirrup and steel,it draws the conclusion that there is a large gap between the code of our country and that of America and Japan.And Japanese code in forecast results is conservative and American code in evaluation of high-strength material is comparatively accurate.In addition,Chinese code of YB 9082-2006 is tend to be unsafe.And the code of JGJ 138 is comparatively reasonable in evaluation of normal SRC short steel.While it is conservative in the evaluation of SHRC and SSHRC.Two kinds of macroscopic finite element modeling approaches of SRC short column are put forward in this thesis based on OpenSees.A kind of refined modeling approach of SRC short column is proposed based on Abaqus,which makes good simulation effect in SRC short column.A conclusion is drawn in this thesis that the bond-slip property between structural steel and concrete have little impact on the simulation effect during the simulation process.