Mechanical Properties And Wind Vibration Response Analysis Of Metal Rock-Wool Sandwich Wall Panel

With the promotion of the design concept of "green building",the assembled structure is bound to become the development trend of the construction industry.Metal rock wool sandwich wall panel is a new assembly structure with light weight,heat insulation,fire protection and quick insertion and assembly characteristics compared with traditional assembly structure.However,the existing studies are limited to traditional test methods,which take a long time and do not involve the study on the connection performance and dynamic behavior between the wall panels.Therefore,in this paper,the finite element method is mainly used to analyze and study the flexural bearing capacity,connection strength and wind-induced vibration response of the wall panel,so as to provide reference for improving the bearing capacity of the sandwich wall panel in the enclosure structure under wind load.The main work done is as follows:(1)Based on the existing tests and using ABAQUS software to establish a reasonable bending model of the wall plate,the main influencing factors of the bending bearing capacity of the wall plate are studied,and the theoretical formulas of different bending bearing capacity of the planar and compressive wall plates under uniform load are derived by combining Wolfel approximate theory and classical mechanical theory.The correctness of the formulas is verified by comparing the numerical simulation results.The influence mechanism of various factors on the bending behavior of sandwich wall panel is analyzed by theoretical formula.(2)Finite element model of wall-panel connection is established,and structural failure process and causes of two types of wall-panel connections in engineering are analyzed.It is concluded that failure of wall-panel interpolation joint is prior to that of tapping screw connection.After that,a large number of numerical simulations were carried out by changing the parameters of the wall panel,and the methods to strengthen the connection performance of the wall panel were discussed.The laws that the connection bearing capacity is proportional to the thickness of the panel and the coefficient of friction,and that the thickness of the core layer and the distance between tapping screws are inversely proportional were summarized.The connection bearing capacity of two types of traditional socket shapes are compared.Based on this,a new design of wall panel socket is proposed and the finite element calculation is carried out.It is found that the connection bearing capacity is 16.9% higher than that of the traditional one.(3)Vibration characteristics of wall panel are studied by mode analysis method.After a lot of finite element parameter calculation,the influence factors of self-vibration frequency and loss factor of wall panel are discussed.It is found that with the decrease of panel thickness and the increase of rock wool thickness,the self-vibration frequency of the structure will be increased with the use of profiled panel.With the increase of panel thickness,the thickness of rock wool decreases,and the loss factor of structure decreases with the use of profiled panel.(4)Based on the method of displaying Cholesky decomposition and Davenport wind speed power spectrum,the program is written with MATLAB software,and the time history curve of the artificial simulated wind pressure is obtained.The time-history response analysis of wind-induced vibration of wall panel is carried out,and the displacement and internal force response laws of key structural joints are obtained.The results of wind-induced vibration response of wall panel under different conditions are discussed.The following conclusions are obtained: under negative wind pressure,the wind-induced vibration response is much higher than that under positive wind pressure,up to 41.7%;The panel thickness and aspect ratio will change the benefit of rock wool damping to wind vibration response.The dynamic amplification factor of rock wool sandwich wall plate is less than 1,and the structure based on equivalent static calculation is safe.The displacement wind vibration coefficient of rock wool sandwich wall panel is inversely proportional to panel thickness,core thickness and aspect ratio.The displacement responses of different plug interfaces are almost identical,but the stress responses of new plug interfaces are much smaller than those of the old ones.