Study On Mechanical Behavior Of Square Steel Tube Steel Recycled Concrete Biased Column

The development and application of recycled concrete technology not only solves the problem of difficult disposal of construction waste,but also saves natural resources and effectively protects the ecological environment.At present,the research on the axial compression performance of the recycled concrete composite structure has been relatively mature,but the research on the biasing performance of the steel tubular steel recycled concrete composite column is less.This paper combines the advantages of the steel recycled concrete composite column and the steel pipe recycled concrete composite column and Effectively overcome the shortcomings of the mechanical properties of the.two the square steel tube steel recycled concrete bias column is proposed.The mechanical properties of the biased column are deeply studied and analyzed,which has certain theoretical significance and practical application value.By observing the failure process and failure morphological characteristics of the bias column during the test,the load-displacement curve of the specimen was obtained.The length ratio,eccentricity,replacement ratio of recycled aggregate,strength of recycled concrete,steel pipe were studied.The influence of parameters such as width-to-thickness ratio,profile steel ratio and section form of steel on the mechanical behavior of the biased column.Based on experimental research,the numerical model of the kind of biased column was established by ABAQUS finite element simulation software.The finite element calculation curve of each test piece and the stress cloud diagram of different parts at different moments were obtained by numerical calculation,and the simulated deformation and test were compared by comparison.The deformation and the degree of agreement between the calculated curve and the results show that the internal steel of the test piece reaches the yield state before the square steel tube,the local bending of the square steel tube in the compression zone is localized,and the recycled concrete of the drum is crushed and destroyed.The whole is bent to the compression zone;the bearing capacity of the biasing column decreases with the replacement ratio of the recycled aggregate,the eccentricity,the width-thickness ratio of the square steel pipe,and the slenderness ratio;it increases with the strength grade of the recycled concrete and the strength of the steel,among which The replacement ratio of recycled aggregate has little effect on the bearing capacity of the biased column.The slenderness ratio and eccentricity have a significant influence on the bearing capacity of the biased column.The maximum decreases are 17.95%and 19.05%,respectively.According to the Chinese regulations and the US regulations,the adverse effects of the specimen eccentricity,the recycled aggregate replacement rate and the slenderness ratio on the bearing capacity are introduced.The practical calculation formula for the suitable bearing capacity of the bias column is obtained by fitting.The conclusion can be used as a reference for practical engineering applications.