Study On Mechanical Properties Of Monolayer Plane Cable Net Glass Facade Under Wind Load

Monolayer plane cable net glass facade structure is widely applied to public buildings due to its characteristics of permeability,livability and beauty.The monolayer plane cable net glass facade is a new tension structure system with prestressed cables as supporting structures.Compared with the traditional building structure,the monolayer plane cable net glass facade is a large-span spatial structure and belongs to the wind sensitive structure..Wind load is the main factor to control the safety of monolayer plane cable net glass facade.Gust coefficient is used to calculate equivalent wind loads in China's building codes.But the equivalent wind load does not take into account the pulsation of the wind.Therefore,there is a great error in the design results according to the specifications.In this paper,a large finite element software ANSYS is used to study the monolayer plane cable net glass facade structure of a project as the research object.Considering the nonlinearity of the curtain wall structure and the interaction of glass and support system,the mechanical energy of the monolayer plane cable net glass facade structure under wind load and the influence of the parameters on its performance are analyzed.(1)Based on the nonlinear analysis theory and the stress characteristics of the monolayer plane cable net glass facade,the hypothesis and boundary conditions of the monolayer plane cable net glass facade model are proposed.Taking a project example of Beijing as the background,considering the synergistic action of the glass panel and the supporting system,the finite element model of the monolayer plane cable net glass facade structure is established.The mechanical properties of monolayer plane cable net glass facade under instantaneous wind load are studied.The numerical results are compared with engineering data to demonstrate the effectiveness of the model.(2)The influence of the thickness of the glass panel,the cable area and the initial prestrain of the cable on the mechanical behavior of the monolayer plane cable net glass facade structure under the ultimate wind load is studied.(3)The characteristics of pulsating wind are analyzed,and the autoregressive AR model in linear filtering method is selected,and the computer program is programmed to simulate the time history of fluctuating wind speed.Comparing the simulated power spectrum and the target power spectrum,the effectiveness of the wind speed time history simulation is verified.(4)Through the modal analysis of the structure,the first ten order natural frequencies of the structure are obtained.The influence of the thickness of the glass panel,the cable area and the initial prestrain of the cable on the mechanical performance of the monolayer plane cable net glass facade structure under the action of dynamic wind load is studied.