The Research On The Behavior Of Latticed Concrete-filled Steel Tube Column With Three Limbs Subjected To Eccentric Compression

Latticed concrete-filled steel tube(CFTS)column with three limbs has a large cross-section and moment of inertia,which can effectively reduce the slenderness ratio of the members,and because the column limbs distribute around the member,when the load eccentricity ratio is large,the column limbs are mainly subjected to axial compression,which can play the advantages of CFTS.There are few experimental studies on latticed concrete-filled steel tube column with three limbs at home and abroad,and the research content and the parameters are very limited,which cause the lack of comprehensive understanding of its working mechanism and characteristics.So both theory and experiment of latticed concrete-filled steel tube column with three limbs need to be further studied,to reveal its regularities,and put forward the reasonable calculation method to guide the engineering practice.This paper describes the mechanical behavior of latticed concrete—filled steel tube column with three limbs subjected to eccentric compression,adopting the combination of theory and experiment,and puts forward the reasonable bearing capacity calculation method.The main achievements can be summarized as follows:(1)Establish the finite element model of latticed concrete—filled steel tube column with three limbs,using ABAQUS finite element software,to guide the experiment and the contrast analysis of the late conclusion.(2)Experimental investigation on 9 latticed concrete-filled steel tube column with three limbs under eccentric compression was carried out.Slenderness ratio,eccentricity ratio,eccentric direction,and the web member form were selected as the main parameters for this study.In order to enhance the sense of this kind of structure,understand comprehensively the force transmission performance,the main limb tube mechanical characteristics,the failure pattern and the ultimate bearing capacity of the structure.(3)Analysis the typical failure mode,the load-deformation curve of the whole process of the characteristics,the influence law of shear deformation and the local damage on the failure,the mechanical characteristics of the web members,using finite element analysis method.(4)Put forward the reasonable bearing capacity calculation method of latticed concrete—filled steel tube column with three limbs.