Research On Static Wind Load Of L-shaped Sectional High-rise Building

With the rapid development of China’s construction industry,more and more super high-rise buildings are emerging rapidly.The super high-rise buildings have the characteristics of high flexibility,light weight and low damping,and the wind load often becomes the control load of structural design.At present,the research on wind load is mainly focused on the high-rise buildings with regular planes,but the research on the super high-rise buildings with irregular L-shaped section is relatively scarce.due to the irregularity of the cross section,the impact,separation and reattachment of air flow are more complex.In this paper,the wind load distribution of super high-rise buildings with L-section is studied by CFD numerical simulation method,and then a series of rigid model wind tunnel tests are carried out on a series of L-section super high-rise buildings.finally,the influence rules of different changing factors on wind load are given,and the relevant conclusions can provide reference for the wind resistance research and design of this kind of structures.The main research contents are as follows:(1)The CFD numerical simulation technology is used to study the CAARC standard high-rise building model commonly used in the world.By comparing and analyzing the numerical simulation results of four turbulence models,four wall functions and different incoming wind angles and the wind tunnel test data of TJ-2 and HD-3,the turbulence model and the selection of wall functions for the numerical simulation of Lshaped super high-rise buildings are given.Finally,the SST k-ω with high calculation accuracy is selected as the turbulence model for the follow-up numerical simulation.(2)Considering the influence of different angles,spacings and side lengths on the three-component coefficient of the L-shaped cross-section model,the numerical simulation test analysis was carried out on the L-shaped model with typical cross-section shape among the influencing factors.The most dangerous wind direction angle of each series of L-shaped models was determined,and the formula between the most dangerous wind direction angle of the single L-shaped model and the angle of the model was fitted.Under the most dangerous wind direction angle of each series of L-shaped model,the variation of the three-component force coefficient of L-shaped super high-rise building model with angle,spacing and side length factors is studied,and the formula between the resistance coefficient of single L-shaped model and the angle of the model is proposed.(3)Wind tunnel tests are carried out on the super high-rise building models with typical L-shaped sections in each series.Under the full wind angle,the correctness and reliability of CFD numerical simulation are verified by comparing the average wind pressure coefficient and three-component force coefficient of wind tunnel test and numerical simulation test.The research conclusions can provide reference for the wind resistance design of L-section super high-rise buildings and the improvement of load code...