Research On Bending Performance Of L-shaped Column Composed Of Concrete Filled Square Steel Tubes

As a new type of structure,Composite concrete filled square steel column Not only cansave space, beautify the indoor environment, but also has better earthquake resistance,flexural properties.However, at present for the study of concrete filled square steel tubularcolumn bending stress performance is less.The current calculation method if consistent withthe of concrete filled steel tubes need to be verified.Through the bending test, finite elementnumerical simulation and theoretical analysis,we have studied bearing capacity and bendingstability of L-shaped column composed of concrete filled square steel tubes.The mainworks and results are as follow:(1) Experimental study on LCFT column:By3different LCFT columns bending loadtest,we understand the behavior and ultimate bearing capacity in different stressenvironment.Through experiments, the load displacement curves of single limb deflectioncurves, load strain curves of the specimens, the whole process of flexural failure were got.(2) Numerical simulation of ANSYS:By establishing the finite element model ofANSYS,we obtain the load displacement curve,deformation chart,stress cloud chart.Itturned out that the finite element model is in good agreement with the experimental data.(3) Theoretical research of LCFT:Through the batten plate model and lacing modelsuperposition,slenderness ratio calculation method is established.Using the formula rules tocheck the unidirectional bending bearing capacity of the test specimens,lattice model should notbe applied.In the biaxial bending aspect,use the rules of formulate have large deviation.Throughthe finite element numerical simulation establishing a Mx/Mmax-My/Mmax curve,we got the formula between biaxial bending and unidirectional bending.The biaxialbending formula was deduced.This dissertation is sponsored by Autonomous Region Natural Science Foundation (#201233146-4)...