| Compared with ordinary steel,stainless steel has many advantages,such as good mechanical properties,perfect surface decoration and corrosion resistance,which makes it a perfect solution to the load-bearing,beautiful and durable problems of modern buildings.With the development of China’s economy,people’s demands on all aspects of architecture are getting higher and higher.Stainless steel structure meets all kinds of requirements for architecture,so it is more and more popular in the field of architecture.At present,the research on stainless steel by domestic and foreign scholars is still very limited,so the development of stainless steel is often limited by this.Based on this,this paper conducts relevant experimental research on stainless steel structure to enrich the experimental data of stainless steel structure and provide reference for subsequent research.The main work of this paper is as follows:(1)This paper compares the similarities and differences of the methods of compressive members in the American Code for Design of Cold Formed Stainless Steel(SEI/ASCE-802),the European Code for Design of Stainless Steel Structures(EN 1993-1-4:2006)and the Chinese Code for Technical Regulations of Stainless Steel Structures(CECS 410:2015).And this paper collects relevant literature at home and abroad for reading and analysis,and on this basis,designs the experimental model of this paper.(2)14 austenitic welded stainless steel square tubes were subjected to axial compression tests.The specimens were divided into five groups,including three groups of short columns and two groups of long columns.The slenderness ratio of the specimens was 7.45-73.08 and the width-thickness ratio was 21.17-66.95.The load-displacement curve,load-strain curve,ultimate load and failure mode of the specimens were obtained through the tests.(3)At the same time,the "stainless steel structure technology specification" and "European standard" are used respectively,and the calculation results are compared with the experimental results.The results show that the short specimens are too conservative to be designed by using the calculation methods of European Code and Technical Regulations for Stainless Steel Structures.The test values of short specimens with slenderness ratios of 7.45-19.85 are about 14.5%-16.7% higher than the design values,and the long specimens are in good agreement with the design curves of the code.The agreement between the experimental data and the standard curve is improved with the increase of the regularization length ratio.Finally,the experimental results in this paper are compared with the experimental results available in the literature.(4)Based on the test data,a refined finite element model is established by using ANSYS software.The axial compression analysis and calculation of austenitic welded stainless steel square tubes are carried out.The results show that the refined finite element model established in this paper can predict the load-carrying capacity of the specimens well.The yield mode calculated by the finite element model analysis is the same as that in the specimens,and the load-displacement curve of the model is similar to the load-displacement curve obtained by the test.Comparing the results of the finite element analysis with the experimental results,it is concluded that according to the initial conditions and material properties given by the test,the specimens are modeled and analyzed by the finite element method.On the premise of accurately establishing the model,reasonably loading steps and appropriate solving methods,the finite element software ANSYS is used to carry out the axial compression of the real specimens of austenitic welded stainless steel square tubes.The simulation results of the specimens are reliable.At the same time,the test data are accurate and effective. |
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