Study On The Influence Of Mountain Terrain On Wind Load Of Super High-Rise Building

China’s mountainous areas are pervasive,and in the past,mountainous areas were not easily accessible.The infrastructure construction was complicated,so few high-rise buildings were on mountainous terrain.However,with social and economic development and continuous breakthroughs in construction technology and space,more and more high-rise buildings are bound to be built on mountainous terrain.There will be significant differences in average wind speed and turbulence in mountainous wind fields compared to flat wind fields.If these differences are ignored,the design of structures can be biased towards unsafe.In the above context,this paper selects a variety of working conditions consisting of mountain models of different heights and widths as the research object.It conducts velocimetric and simultaneous pressure measurement wind tunnel tests to study the wind effects of mountain super-tall buildings.The above experiments use the controlled variable method,and a flat base of the same height as the mountain is chosen to simulate the flat terrain.The test data measured under the two different terrains are compared and analyzed.The details of the study are as follows:In terrain category A,wind tunnel tests were carried out on a single mountain and a continuous mountain.Based on the wind tunnel tests results,the wind pressure distribution characteristics of the building fa?ade and the wind pressure variation law at specific measurement points with changing wind angles were investigated when the super tall building model was located on top of different hills.Wind pressure coefficients and wind flow analysis were carried out on the specific measurement points.The wind pressure patterns specific to the building model at different wind angles and mountain conditions were analyzed through the data.Afterward,the pulsating wind pressure correlation coefficients for each elevation of the building model were analyzed in both horizontal and vertical directions.The results show that the different angles between the direction of the mountain range and the incoming wind greatly influence the wind pressure on the building surface.At a wind angle of 0°,when the incoming wind is perpendicular to the direction of the mountain range,the surface wind pressure of the mountain building is weakened compared to that of the flat building,and the weakening phenomenon is more evident on the leeward and side wind sides.The variation of the three-part force coefficient with the height of the measured layer is investigated.The analysis of the body coefficients of each building fa?ade leads to the conclusion that the mountain’s width and height and the mountains’ mutual shading all cause the incoming wind to affect the building model differently.The force situation changes,and the mountain topography has a more pronounced effect on the wind load near the site.At the article,the wind speed at various hill locations is studied,and the acceleration and turbulence ratios are derived.The acceleration ratio is mostly positive on the side and top of the hill.The acceleration ratio is primarily negative on the windward side and below the hillside.The acceleration and turbulence ratios vary greatly between wind angles and hills.The greater the hill slope,the stronger the weakening effect on the wind speed.