Analysis And Research On Wind Field Characteristics Of Multi-storey Building Roof

In recent years,in view of the major hazards of wind disasters,many domestic and foreign scholars have carried out a series of studies on the wind load characteristics and wind-induced response of low-rise buildings and high-rise buildings,and have achieved many corresponding results to promote the development of wind engineering.An indelible contribution has been made,but due to China 's economic development history and special national conditions,many multi-storey buildings still exist in hospitals,schools,and office buildings in many cities,but there is little research on the wind resistance of multi-storey buildings,so It is of certain value to carry out research on wind engineering characteristics of multi-storey buildings.In addition,due to the national emphasis on environmental protection issues,the rapid development of renewable energy has been promoted.Many building roofs are equipped with photovoltaic panels,condensers and other solar thermal power generation equipment,and this type of structure is more sensitive to the impact of wind loads.The roof wind field is an important prerequisite for studying the wind load of roofing equipment.Therefore,it is of great scientific significance and engineering value to carry out analysis and research on the roof wind field of a multi-story building structure.In this paper,the in-depth analysis and research on the roof wind field characteristics of multi-storey buildings is carried out through field measurements,wind tunnel tests and numerical simulations.The main research contents are as follows:(1).Through the analysis of the measured data of the wind field on the roof of a multi-story building,this paper studies the changes over time of the average wind speed,turbulence intensity,and gust factor of a multi-story building roof,as well as the average wind speed and turbulence intensity,and the turbulent integral scale Correlation,and finally analyzed the agreement between the measured data and the Von Karman spectrum.(2).This paper conducted wind tunnel tests on the wind field at the top of the multi-storey building at different wind direction angles.Based on the test data of three reference points of the roof A,B,and C,the effects of different wind direction angles on the roof wind field,and the change law of the roof wind field flowing down in different wind directions and the wind field distribution of the roof,and the difference between the roof wind field and the undisturbed incoming wind field is analyzed.(3).Full-scale numerical simulation of multi-story buildings based on numerical simulation software Fluent 17.2.Based on the results of numerical simulations,the variation rules of roof wind speed and turbulence with height were analyzed,and the wind field and surrounding wind fields of multi-story buildings In the end,the change of the roof wind field under the same wind direction and different wind speed was studied.