Study On The Mechanical Performance Of Rectangular Concretefilled Steel Tube Corbel Columns

With the development of industry and economy,and the progress of the times,there are more and more large-span and heavy-duty structures,and higher requirements are placed on building materials and structures.In this context,the CFST（short for concrete-filled steel tube）structure has been used more and more widely,and it has become an important development direction of the structural engineering discipline.The application practice of the CFST corbel columns in industrial plants is increasing,but the corresponding theoretical support is very limited,so further research is necessary.Based on ABAQUS software platform,this thesis conducts a simulation study of the mechanical properties for the CFST corbel column with rectangular section,it reveals the mechanical performance under eccentric load and the seismic performance under low-cycle reciprocating load of the CFST corbel column with rectangular section.The specific discussion content is as follows:（1）A suitable finite element modeling method of the CFST corbel column with rectangular section was established,and its feasibility was verified based on experiments.On this basis,the research model was analyzed,further the failure form,ultimate bearing capacity and loaddisplacement curve of the obtained CFST corbel columns with rectangular cross-section was obtained.（2）The influencing parameters of the mechanical properties of the CFST corbel column with rectangular section were studied,including: slenderness ratio,eccentricity,steel tube wall thickness,material strength,etc.（3）The range analysis and two-factor analysis of variance were performed on the abovementioned influencing parameters,the two most influential parameters were clarified,the reduction factors of slenderness ratio and eccentricity were determined,and the calculation formula of the bearing capacity of the CFST corbel columns with rectangular cross-section was proposed.（4）The seismic performance of the CFST corbel column members with rectangular crosssection under low-cycle reciprocating load was simulated,the hysteresis curve,skeleton curve,energy dissipation capacity and ductility coefficient were analyzed,and the influence of different working conditions of crane beam on seismic performance was discussed.The research results of this thesis provide a basis for the establishment of the design theory of the CFST corbel columns,and have certain significance to its application in practical engineering.