Study On Static Force And Fire Resistance Of Recycled Concrete Core Column Of Cross Steel Tube

With the development of the country and social economy,the development scale in the field of architecture is particularly rapid,and people have higher and higher requirements for the quality of life,as well as higher and higher requirements for the utilization of residential space,the evenness and aesthetics of interior space.The emergence of special-shaped columns effectively solves the above problems.Special-shaped concrete-filled steel tube(CFST)core columns combine the advantages of reinforced concrete special-shaped columns and concretefilled steel tube(CFST)columns and are more and more used in construction projects.The development of the construction industry also brings more construction waste.The application of recycled concrete into the structure is in line with the concept of green development.In this article,nonlinear finite element software ABAQUS is used to study the static force and fire resistance of regenerated concrete core columns of cruciform steel tubes,first of all,to simulate the component under axial load and change the parameters for the stirrup spacing,the core and outer recycled concrete strength grade,according to the stress nephogram and extraction of simulated load-displacement curve to analyze the influence of various parameters on the axial pressure to learn performance.Secondly,the component is simulated under unidirectional small eccentric load,and the changed parameters are stirrup spacing and steel tube strength grade.According to the simulated stress nephogram and the extracted load-vertical displacement curve and load-transverse deflection,the influence of each parameter on the mechanical properties of component bias is analyzed.Finally simulation analysis of the component under fire,with a standard uniform heating curves of artifacts around the fire simulation,to get the temperature field distribution of artifacts,and the temperature field by means of thermal-mechanical coupling of nodes in the simulated temperature import mechanical field,by changing the axial load size to analyze the component of fireproof performance.Through the above three parts of simulation analysis,the characteristics of static force and fire resistance of recycled concrete core column with cross steel tube are summarized,and some problems to be studied are put forward.