| To promote the development of the prefabricated frame structure system,this dissertation proposed a new type of joint for assembling steel-concrete composite beam and columns.It consists of prefabricated steel-concrete composite beam,short steel column and prefabricated steel-concrete composite column connected by bolts.As the joint is the important force transfer part in the frame structures,this dissertation studies the design methods,mechanical properties and structural detail.The main contents are summarized as follows:(1)Combining the specifications and the existing composite structures research results.This dissertation puts forward the design method of the assembling steel-concrete composite beam-to-column joints and gives a design example.(2)The plane finite element model of the steel-concrete composite parts is established by 2D equivalent method.The validity of the modeling method is verified by the existing test results.Then a 3D finite element model of the steel-concrete composite part is established,and its results agree well with the 2D modeling method results.(3)The 3D standard finite element model of the assembling steel-concrete composite beam-to-column joint is established,and the parameter analysis is carried out.The results show that: the change of the shear connection degree and the stud spacing will cause two kinds of failure modes in the composite joint: sheared off of the stud and buckling of the end steel beam.While the change of the concrete strength and the length of the end steel beam will only lead to the buckling of the end steel beam.The shear connection degree and the length of the end steel beam have significant influence on the bending capacity of the joints.(4)According to the specifications and parametric analysis results,the structural detail suggestions of the bolt arrangement,the stud layout and the length of the end steel beam for the fabricated steel-concrete composite joints are put forward. |
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