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Research on mechanical properties of thin-walled concrete-filled steel tubular members and joints pdf

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2021-12-15
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Brief introduction: Concrete filled steel tube structure is widely used in building structure, bridge structure, ocean engineering and transmission line engineering because of its excellent mechanical properties and good economic benefits The concrete filled thin-walled steel tube structure can effectively solve the local buckling problem of the pipe wall. With the active promotion of UHV transmission project in China, the large diameter thickness ratio thin-walled concrete-filled steel tube structure will have a wide application space Because there is no perfect design criterion for this kind of structure, it makes the corresponding research more urgent and practical significance In this paper, the mechanical properties and design methods of thin-walled concrete-filled circular steel tubular structures are studied. The main contents include the following aspects: (1) a lattice steel reinforced concrete-filled circular steel tube structure is proposed to solve the problem of insufficient internal concrete restraint in axial compression members with large diameter thickness ratio The axial compression test and finite element numerical simulation are carried out for this kind of member column. The influence of bone matching index, steel bone content, slenderness ratio and steel strength on the bearing capacity and failure mode of the composite column are analyzed, and the rationality of the section stress is verified by the finite element model Finally, a practical formula for calculating the axial bearing capacity of steel reinforced concrete-filled circular steel tube is established considering the interaction between steel reinforced concrete and concrete filled steel tube (2) The experimental study and finite element numerical analysis on the stress concentration factor of concrete-filled thin-walled tubular joints are carried out. The effects of joint type and thickness of main pipe wall on the stress concentration factor of main pipe and branch pipe wall near the weld joint are studied respectively The applicability of the formula for CFST joints is studied by comparing the experimental results with the calculated values of the stress concentration factor formula of the existing tubular joints (3) The mechanical properties of thin-walled concrete-filled circular steel tubular (CFST) joints under axial tension were studied
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