| The research on anti-progressive collapse has become the focus of structural research,and related results have been obtained.The structural form,force form,material parameters and other related knowledge are also considered as different aspects to promote the in-depth study of the subject.It is known that frame-shear structure is also used in various types of buildings in life as one of the different structural forms,and large-span structures are also used in various structures.In this article,the large-span frame that needs to be studied Shear structures have also been widely used in various sports spaces and public buildings,but whether it is a frame-shear structure or a large-span frame,due to its complex structure and integrity,domestic and foreign research on related experiments and simulations Relatively small.In a relatively late period,the research efforts were not deep enough.Therefore,there is a need for further research and discussion on this subject.In this paper,instantaneous unloading method and nonlinear dynamic analysis method are used to study the progressive collapse performance of long-span frame-shear structure.The main work and results are as follows:（1）Aiming at the collapse test of Professor Yi Weijian,based on ABAQUS as the analysis platform,the correctness of the modeling method,simulation process and parameter selection was verified.（2）Use ABAQUS to establish a separate model.Use the instantaneous loading method to simulate the failure of the construction.The column B connected to the shear wall and the long-side middle column A are respectively removed,and the long-side shear wall D and the short-side shear wall C of the first floor are respectively removed.:On the first floor,the long-side column A is removed,and the vertical displacement is87 mm,while the vertical displacement of the removed column B is 8.8mm.The safety of the failure of the B column is much higher than that of the A column,and the shear wall C and D are removed.The vertical displacement under the conditions is only0.6mm and 0.25 mm.The risk of progressive collapse of the demolished column is much greater than that of the shear wall,and neither of the two working conditions collapses.（3）Extract the relevant cloud diagrams and curves in the post-processing,deeply analyze the stress transfer and distribution laws of the working conditions in 4,and propose effective measures based on the relevant analysis conclusions.（4）Use ABAQUS to adjust the reinforcement ratio and column section size of the Y-direction large-span frame beam of the large-span frame-shear structure with other parameters unchanged,and take the failure of the first story column as an example to perform nonlinear structural analysis.The results of dynamic analysis show that increasing the reinforcement ratio of Y-direction large-span frame beams and increasing the size of column section have a positive effect on improving the large-span frame-shear structure. |
