| Renovation of the light steel floor is an effective means to solve the shortage of housing land.However,due to the sudden changes in the mass and stiffness of the upper and lower structures,when the earthquake comes,the weak layer of the structure is prone to damage,which in turn affects the overall seismic performance of the structure.Therefore,the research on the overall cooperative performance of the structure is particularly important.In this paper,based on the research of the new outer hoop type joint proposed by the research group,it is applied to the hybrid structure of light steel structure,and the finite element model is established by ABAQUS.In-depth research was carried out,and related factors affecting the seismic performance of the hybrid structure were studied based on the factors affecting its seismic performance.It provides a certain theoretical reference for the design of actual projects.The specific research contents are as follows:(1)By reading the existing literature at home and abroad,fully understand the current development background and research status of the building floor renovation technology,and determine the research direction and content of this article for the current problems.(2)The correctness of the finite element model of the new outer-hoop joint and the traditional reinforced joint light-steel hybrid structure.Based on the seismic performance test of the new outer hoop joints of this research group and the seismic performance test of a hybrid structure of light-steel reinforced joints with traditional reinforced joints in related literature,the same finite element model was established and calculated using the ABAQUS finite element software.The seismic performances such as the internal force distribution characteristics and the failure form of the two under low-cycle reciprocating loads are analyzed,and compared with the test results to verify the correctness of the finite element model.(3)The model establishment and result analysis of a new type of light steel incremental hybrid structure with external hoop joints.By using the finite element modeling method verified by the correctness,a new type of hybrid structure model with hoop joints is established to study its internal force distribution characteristics,failure patterns and other seismic performance under the action of low cycle reciprocating load,and to compare it with the traditional hybrid structure model with planting reinforcementjoints.The conclusion is that the new hybrid structure of outer hoop joint has better overall cooperative performance,and the stiffness of the joint area is higher.The plastic hinge appears outside and moves to the edge of the column base plate,protecting the core area of the joint.(4)Analyze the influence of relevant parameters on the overall seismic performance of the structure.By changing the concrete strength grade of the lower structure,the rigidity of the lower structure and the rigidity of the upper structure,the influence of different factors on the overall seismic performance of the structure is analyzed.The results show that:①The improvement of the concrete strength level of the lower structure can increase the initial stiffness of the structure,but it will cause the top layer whiplash effect to be obvious;②The increase of the rigidity of the lower structure will make the initial rigidity and bearing capacity of the structure significantly improved,but the whiplash effect of the top layer is also more obvious;③The increase of the rigidity of the superstructure can effectively improve the bearing capacity of the top layer of the structure,alleviate the whiplash effect of the top layer,and improve the overall cooperative working performance of the structure.Finally,according to the corresponding parameter analysis results,put forward reasonable design suggestions.(5)According to the parameter analysis results,the model is optimized and calculated,and the difference in seismic performance of the structure before and after optimization is comprehensively analyzed. |
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