Experimental Study On Low-cycle Reciprocating Loading Of The Core-insert Joint Of The Curtain Wall Column

Curtain Wall structure is widely used in high-rise buildings and is greatly affected by earthquake.Nowadays,most researches on the seismic behavior of curtain wall are biased toward the seismic behavior analysis of the whole structure of curtain wall,However,the existing research on seismic behavior of curtain wall column core-inserted joints is insufficient,therefore,it is necessary to study the seismic behavior of the curtain Wall column-cored joints.In order to study and analyze the seismic performance of curtain wall column insertion,in consideration of the complex contact and friction problems at the column insertion joints and the contact nonlinearity and geometric nonlinearity,finite element analysis and experimental research were carried out on the curtain wall column insertion.Through the analysis of anti-seismic indexes such as ductility coefficient,the ratio of tensile strength and yield strength,and energy-dissipating capacity,the reliability of column insertion joints was illustrated.In this paper,the development and research history of curtain wall were briefly described,and then the main research contents of this paper were introduced.The contact theory and application method of ABAQUS finite element analysis were introduced.The basic contact types of ABAQUS contact analysis were described,and the types and application scope of contact units were introduced in detail;then,the contact guide function modules needed to establish the contact relationship were briefly described;contact algorithm,contact attributes and the interference fit of contact were introduced;brief description was also made about whether the effect of friction was considered in finite element method;and detailed introduction was made about how to control the convergence of contact analysis.Based on the experimental analysis of two groups of insertion columns with different lengths,the finite element analysis model simulation of columns and insertions with different lengths was established.Through fitting test and finite element simulation,the insertion stress,hysteretic curve and skeleton curve of the contact part of the column insertion were analyzed and studied.The location of the maximum contact stress under the action of repeated loading was determined in consideration of the influence of contact nonlinearity,geometric nonlinearity and other factors.Finally,the following conclusions are drawn:(1)the results showed that the column insertion had certain anti-seismic capacity,but its capacity was not strong.(2)For areas with high anti-seismic requirements,the ductility and the ratio of tensile strength and yield strength could be improved by increasing the length of the insertion,thus achieving the improvement of its anti-seismic performance.(3)Through the comparison of finite element method and experiment,the conclusions drawn in the previous chapter wasfurther demonstrated.Finally,summary conclusions and suggestions were proposed on the main contents of this paper,and suggestions were put forward on the further research direction and contents under this topic.