| With the development of modern science and technology and the requirements of people's economy and technology,the development trend of modern buildings is toward the development of high-rise buildings with less floor space and beautiful appearance,as well as other social basic activities of one of the important indicators for modern engineering construction,in order to meet people's growing demand,you need to build more larger buildings which the bearing capacity of concrete filled steel tube with its high ductility and plastic good economic benefits and more convenient than traditional concrete structure construction characteristics are widely used in modern engineering various types of structure at the top Concrete-filled steel tube(CFST)in super high-rise buildings has developed its good performance.Concrete-filled steel tube(CFST),as a composite member,is composed of an outer surrounded steel tube and an inner layer of concrete.In the process of stress,steel tube ACTS as a constraint on concrete,and in turn,due to the compressive properties of concrete,it can also limit the local buckling of steel tube.In order to meet the requirements of new super highrise buildings,people begin to explore new composite components of concrete-filled steel tube.Due to the extensive application of concrete-filled steel tube in engineering practice,the use of concrete-filled steel tube structure is more or less slightly or seriously corroded under the influence of complicated environment.Corrosion causes great direct or indirect economic loss to the structure every year at home and abroad,which has attracted extensive attention from experts and scholars at home and abroad.It is hoped that we can use the corrosion we have learned to protect the structure affected by corrosion,so as to avoid part of the economic loss.Based on simulation,this paper studies the mechanical properties of short column axial compression and long column axial compression of hollow sandwich concrete-filled steel tube,mainly completing the following work:(1)In this paper,24 hollow sandwich concrete filled steel tubes were immersed in 5% and 10% sulfate solutions for 30 days and 60 days respectively.The load-deformation curve relation of the pattern is studied.This paper explores and discusses the influence of several factors on the ultimate bearing capacity of components,such as different length-to-thickness ratio,hollow steel tube section form,time of corroded components in solution and concentration of corroded solutions,summarizes relevant experimental research results and compares the experimental data in this paper for result analysis.(2)In previous studies,on the basis of mechanical properties of concrete-filled steel tube column,summarizes relevant test experience,the introduction of ABAQUS finite element simulation software to establish the reasonable finite element model for finite element simulation test of the hollow interlayer concrete member,square hollow interlayer of different cross section forms to study the ultimate bearing capacity of concrete-filled steel tube column,analyzing the distribution of shear stress between steel tube and concrete,the influence of the interaction force between steel and concrete,and the finite element simulation results,comparing the results with the experimental data validated the reliability of the model.(3)Finally,according to the experimental results and simulation results,the optimization of hollow sandwich concrete-filled steel tube is carried out.The experimental results show that when the length-to-thickness ratio is less than 5,the length-to-thickness ratio has little influence on the ultimate bearing capacity of hollow sandwich concrete-filled steel tube,and the mechanical properties of the circular section are better than those of the square section.The combination of steel tube and concrete can protect concrete from erosion to some extent in the environment of sulfate corrosion. |
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