| Stainless steel core plate structure is a structural system composed of two extremely thin stainless steel skin panels and stainless steel cylinder core tubes arranged in accordance with certain rules,which are connected by hot-air copper brazing to form a whole load-bearing system.Stainless steel core plate T-shaped wall is a special-shaped member vertically welded by two identical stainless steel core plate straight walls,special shaped members have better spatial mechanical performance than linear plane members,such as L-shaped and cross-shaped,and they can make better use of the internal space when hidden in the edges and corners of buildings than the common rectangular and circular sections,so they have been favored by the majority of designers and users in recent decades.As a brand-new structural system,stainless steel core plate structure can be used as various load-bearing structural components such as floor,column and wall in the future market.Therefore,it is very necessary to study the special-shaped components of stainless steel core plate structure.In this paper,based on the existing research results of the stainless steel core plate structure of Yuan Da Technology Group and Hunan University,the research on the mechannical performance of the stainless steel core plate T-shaped wall was carried out under the combined action of axial compression and biaxial bending.The main research work was as follows:(1)The material mechanical properties of austenitic S304L stainless steel were studied: through the tension and compression tests of several austenitic S304L stainless steel specimens,the main mechanical indexes of the material were obtained by sorting out the data,and the compression constitutive relationship of S304L was proposed as the material basis of all biaxial bias numerical models in this paper;Six full-scale T-shaped walls with stainless steel core plate under eccentric compression were tested and studied.The failure process of each member was summarized,and six groups of load displacement curves were obtained.(2)Firstly,the finite element simulation of T-shaped wall with stainless steel core plate was carried out,and the analysis results were compared with the experimental results.The ideal bending model was used to analyze the stress of T-shaped wall under biaxial eccentric compression wi th different panel thickness.It was concluded that the panel thickness directly affects the stress failure of T-shaped wall under uniaxial bending load;Then,16 groups of finite element models were established for four different panel thickness,two diff erent axial compression ratios and two different loading angles to calculate the ultimate bearing capacity of T-shaped wall with stainless steel core plate under biaxial compression and bending,and the failure process of T-shaped wall under biaxial compression and bending was studied by using one of the typical examples;(3)Parametric analysis was carried out for eight parameters,including axial compression ratio,height width ratio,panel thickness,side plate thickness,core tube thickness,wall limb section length width ratio,core tube transverse spacing and loading path.The influence of various parameters on the ultimate bending capacity of stainless steel core plate T-shaped wall was analyzed,and the main influencing factors were obtained,which laid the foundation for the later research on ultimate bending capacity formula;(4)After summarizing the results of a large number of numerical examples,the relationship among different panel thickness,loading angle and axial compression ratio was analyzed emphatically,and the normalized interaction equation under different axial compression ratio was expressed by two-dimensional plane curve. |
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