Wind Induced Comfort Probability Model Research Of High-rise Residential Buildings Considering Surface Protrusion

In recent years,with the continuous improvementt of China’s urbanization level,the number of high-rise buildings in China continues to increase.For high-rise buildings,wind load is one of the main lateral loads.Human comfort under wind load is an important problem in structural design.The surface of high-rise residences usually have protruding balconies,which can produce complex interaction under wind load.However,the researches at home and abroad are mostly based on buildings with smooth surfaces.China’s relevant building codes and standards have not mentioned surface protrusion.The comfort level is the primary condition for people to evaluate the quality of residential buildings.Therefore,it is of great significance to carry out research on wind-induced comfort of high-rise residential buildings considering the impact of surface protrusion.In this paper,a series of studies are carried out on wind load characteristics and vibration comfort of high-rise residential structures with surface protrusion.Two research methods including rigid model pressure test and numerical simulation are used for analysis.The main research contents are as follows:Atmospheric boundary layer simulation is carried out at Shenzhen Engineering Lab for Wind Environment and Technology,Harbin Institute of Technology,Shenzhen.Class D landform at 1:300 scale is successfully simulated.CAARC standard model of high-rise buildings is used in the wind tunnel test.The convex characteristics of high-rise buildings is simulated by pasting plexiglass plates on the surface of the model.The effects of different degrees of convex on wind pressure distribution characteristics and wind load shape coefficient are analyzed.Considering the strong non-gaussian probability characteristics of wind pressure caused by the protrusion on the surface of high-rise residential buildings,the first four order statistics are selected for analysis.The change rule of statistics with the wind angle and the surface projection dimensions is studied.Aiming at the statistical law of the convex surface,a method of wind load analysis is proposed.The paper used chebyshev polynomial to fit the parameters of the probability model of wind load on convex surface,and established the corresponding relation between the degree of surface convexity and the probability characteristics of wind load through Hermite functional transformation.Considering the randomness of the response of buildings and the uncertainty of the body sensing,a probabilistic evaluation model of comfort degree of high-rise building with convex surface is established.The comfort degree is calculated and analyzed.Finite element software ANSYS is used to build a full-size model,and the dynamic response is simulated.The acceleration response of the structure is calculated.The effect of different surface bulges on the acceleration is compared and analyzed.Based on the dynamic response analysis of high-rise residential buildings with surface protrusion,the structural probability response curves are obtained correspondingly.The factors influencing comfort level are analyzed according to the uncertainty of human perception threshold.Based on the comfort probability model with(PBD)performance-based design,the acceleration response limits of structures with different convex surfaces under certain acceptability are studied.The transcendence probability of structures under different conditions is obtained.The results of this paper can provide design support for the design of such building structures.