Numerical Simulation And Analysis Of Wind Pressure Distribution For 800 M Span Cylindrical Reticulated Shell

With the development of science and technology,there are engineers put forward to building a big dome with the span of thousands meters for people to live in.After that,there are many problems come to people.For example,how to adjust the wind environment of such a big space to be comfortable to live in and how to resist wind load outside.Based on 800 m span cylindrical reticulated shell,the paper studied all the problems in resisting wind loads.The main problems researched in this paper are follows:1.The research of indoor wind environment for 800 m span cylindrical reticulated shellBased on CFD analysis software FLUENT,the model of indoor wind environment under sun exposure and normal ventilation was established,and the influence of natural ventilation openings on indoor wind environment was discussed.The difference of the ventilation effect under the condition of different ventilation and exhaust ports of natural ventilation,the height difference of inlet and outlet,the form of exhaust vents and different densities of buildings are analyzed.Also,the paper has analyzed the influence of different patterns of air flow organization and different power forms on comfort experience of indoor environment.2.The numerical simulation and analysis of wind pressure distribution characteristics on 800 m span cylindrical reticulated shellSuper-large span structures generally have the characteristics of light weight,small stiffness and low natural vibration frequency,and they are mostly sensitive to the wind load.The study of wind pressure coefficient distribution is of great significance to engineering design.Though with the similar shape,it still needs to be checked whether the regulation in load code for the design of building structures about wind load for ground-mounted arch roofs can be applied directly to the design of 800 m span cylindrical reticulated shell.After verifying the accuracy of numerical simulation method,the wind pressure coefficient distributions of the reticulated shells in different forms are simulated by FLUENT.Comparison between simulation results and the current regulations of standards is carried out.By the contrastive analysis,the influence of different angles of wind direction,ratio of rise to span,span and aspect ratio on wind pressure coefficient distribution is also explored.The results show that the regulations about wind load in the code are not sufficient to design super-large span cylindrical reticulated shell.The ratio of rise to span has the greatest effect on the distribution of the wind pressure coefficient,and the influence of the aspect ratio comes second.The distribution of the wind pressure coefficient changes little while the ratio of rise to span is a fixed value.3.Wind vibration response characteristics analysis of 800 m span cylindrical reticulated shellBased on the MATLAB software,the autoregressive method is used to simulate the wind speed pulsation,and the change of wind speed by time is obtained.Based on the simulated pulsating wind speed time history,the finite element model of the 800 m super large span suspension arch truss structure is established.The wind-induced response characteristics of the cylindrical reticulated shell are studied.The numbers of wind-induced vibration coefficient of all nodes in 800 m span cylindrical reticulated shell are given in this paper and the average number is 1.8.Considering the static effect of the average wind on the structure only is unsafe,the wind-induced vibration of the wind caused by change of wind speed cannot be neglected.