Experimental Study And Finite Element Analysis Of Shear Properties Of Core Tubes With Core Tubular Stainless Steel Slab Structure

The core tubular stainless steel slab structure is a new type of building structural system,core tubular stainless steel slabs are similar to the honeycomb plate structure,which are made of stainless steel thin-walled core tubes in the middle of two stainless steel panels.Copper brazing is used to weld the core tubes and panels into a firm whole.The core tubular stainless steel slab structure combines the new structure of the honeycomb plates,which is superior in performance,with stainless steel,a material with good development prospects.Through the splicing and combination of the core tubular stainless steel slab standard parts,components such as beams,boards,columns and walls in the building structure can be made,and then used for the installation and construction of building structures.The core tubular stainless steel slab structure fully embodies the principles of standardization,industrialization,diversification,and generalization,and in line with China's development strategy of vigorously developing prefabricated buildings and promoting the industrialization of housing,with broad development prospects and application value.At present,the study of the core tubular stainless steel slab structure is still in its infancy,and there is a lot of work to be done,especially the study of the basic mechanical properties of the core tubular stainless steel slab structure.The force mechanism of the core tubular stainless steel slab structure is very similar to that of the honeycomb plate structure.In honeycomb plates,the shear force is mainly borne by the core between the two panels,and the core tubes in the core tubular stainless steel slab structure are equivalent to the core in honeycomb plates,so it is necessary to study the shear properties of core tubes of stainless steel sandwich structure.In this thesis,core tubes of stainless steel sandwich structure are taken as the research object,through the combination of experimental research and finite element analysis,their shear properties were studied,and the main content of this thesis is as follows:(1)Outline the research and application of honeycomb plates and stainless steel materials,and briefly introduce the relevant theoretical basis of honeycomb plates.(2)Shear tests were conducted on multiple sets of shear test pieces of core tubes of core tubular stainless steel slabs.The load-displacement curves of each set of specimens under shear were obtained,and the inflection point load values,extreme point load values and the slope of the load-displacement curve line segment of each set of test pieces were determined.Shear strength and shear modulus of elasticity of the group tube specimens were calculated.By observing the experimental phenomenon,it was found that the damage of the core tubes of core tubular stainless steel slab structure occurred in the compression zone at the end of the core tubes.(3)Several sets of finite element analysis models were established using ABAQUS finite element software.The finite element analysis results were compared with the test results,and the accuracy of the finite element analysis model was verified.Based on this,shear force process and failure mechanism of the core tubes of stainless steel sandwich structure was analyzed.(4)Through the finite element analysis,the effects of factors such as outer diameter,wall thickness,height and ratio of diameter to thickness of the core tubes on the shear properties of the core tubes of stainless steel sandwich structure were studied,and the calculation formulas of shear bearing capacity of core tubes of core tubular stainless steel slab structure are deduced.