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Eigenvalue buckling analysis of H type honeycombed composite column with rectangular concrete-filled steel tube flanges

Ji Jing;Xu Zhichao;Zhang Wenfu;Shen Jing;Zhou Lijian;Liu Yingchun;Lu Zhaohong;Wang Binzhou;Heilongjiang Key Laboratory of Disaster Prevention,Mitigation and Protection Engineering,Northeast Petroleum University;School of Civil Engineering,Nanjing Institute of Technology;Oil Recovery Plant No.2,Daqing Oilfield Company Limited;Northeast Oil Sales Branch,PetroChina Company Limited;  
In order to study the overall stability of STHCC,the section form,constraint condition,component length and the concrete grade for the parameters,11different section forms of H type honeycomb steel column and 18STHCC components were designed.Using ABAQUS software to establish the finite element model of 29 H honeycomb steel columns,the eigenvalue buckling analysis is carried out based on the simplified mechanical model and constitutive model.Through comparing the simulation analysis and theoretical results of the STHCC,both of which are in good agreement,the rationality of the finite element model is verified in this paper.The eigenvalue buckling analysis of 18STHCC is carried out based on the above mentioned.The deformation cloud and buckling load in the first order mode are extracted and compared.The variation law of buckling load and deformation under different cross section form,slenderness ratio,constraint mode and concrete grade condition were investigated.The results show that the honeycomb shaped web plate can not only reduce the amount of steel,but also affect the stability of the component.The overall stability of the STHCC component is better than that of the common H type steel column and the flange of the steel tube H type steel column.Under the same conditions,compared with the ordinary H steel column and H type steel column with flange for steel tube,the STHCC can increase the buckling load by 1.88times and 1.23times.After the STHCC member flange of the steel pipe is provided with the stiffening rib,the buckling load will be increased by 1.31times,and the overall stability of the composite column can be greatly improved by adding stiffening rib reasonably.With the increase of the concrete strength grade,the growth rate of the buckling load decreases gradually.The pcrcalculation formula of buckling load of STHCC component is established by the simplified coefficientβbased on the finite element numerical solution.The buckling mode can provide the initial imperfection for the nonlinear stability.Lastly the design proposal of this new type of composite column in practical engineering is given.
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