| Compared with traditional prefabricated buildings,prefabricated modular buildings have many advantages such as high prefabrication rate,high assembly efficiency,energy saving and efficiency reduction.The light steel reinforced concrete frame structure system for modular wall is a kind of prefabricated light steel frameinsulation composite light wall structure.With the popularity of prefabricated modular buildings,it will be widely used in various fields in the future.In this thesis,a beamcolumn joint of light steel reinforced concrete frame structure system for modular wall is proposed,that is,cold-formed thin-walled steel reinforced concrete composite column-H-shaped steel beam joint.The top and bottom angle steel with double web angle steel connection form is adopted.Through experiment and finite element research,the semi-rigid connection characteristics and bending moment-rotation relationship model of beam-column joint are obtained.The specific research processes are as follows :(1)Nine groups of beam-column joint specimens with single variable parameter were designed,and static loading tests were carried out on the specimens with different parameters at the beam end to observe their deformation characteristics and failure modes.The results indicate that under monotonic loading at the beam end,the initial rotational stiffness and bending bearing capacity of the beam-column joint exhibit semi-rigid characteristics,and its static performance becomes stronger with stronger constraints.(2)The ABAQUS finite element software is used to establish the cold-formed thin-walled steel reinforced concrete composite column-H-shaped steel beam joint model.The finite element analysis results are compared with the experimental results to verify the rationality of the finite element model.On the basis of the reliable verification of the finite element analysis results,the variable parameter analysis of the beam-column joints is carried out,including the three parameters of H-shaped steel beam section height,C-shaped steel thickness and angle steel thickness.The results show that the H-shaped steel beam height and angle steel thickness have a great influence on the static performance of the beam-column joints,while the influence of C-shaped steel thickness on the initial rotational stiffness is not obvious.(3)According to the component method of EC4 specification and refer to the relevant literature,a simplified formula for calculating the initial rotational stiffness and flexural capacity of cold-formed thin-walled steel reinforced concrete composite column-H-shaped steel beam joint is proposed,and the formula calculation results are in good agreement with the finite element simulation results.The research shows that the cold-formed thin-walled steel reinforced concrete composite column-H-shaped steel beam joints show obvious semi-rigid characteristics,with good deformation ability and high bending bearing capacity.The parameter analysis results show that the beam section height and angle steel thickness have a great influence on the static performance of the joints.The error between the initial rotational stiffness and bending bearing capacity of the joints obtained by the simplified calculation method and the finite element results is within 15%,which can provide reference for engineering design. |
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