Numerical Simulation And Analysis Of Wind Load On Tall Buildings

With the development of economy, improvement of technology and considering the needs of land conservation during the urban construction, tall and high-rise buildings have been developed greatly. Because of the greater height and lower stiffness, the effect of wind load increased prominently. Wind tunnel test method is used in projects, but it has faults of long test period, high charges and scale effects. With the improvement of computer memory and operation speed, numerical simulation method gradually exhibits its superiority and becomes a hot spot of present research. Currently numerical simulation technology of wind load on tall buildings is not mature enough and rarely used in projects. Consequently a systematic study of wind load on tall buildings used numerical simulation method is of great significance and practical engineering value.On the basis of a comprehensive summarizing and reviewing of existing results, the fundamental equations of common used turbulence models were derived base on the Reynolds Averaged Navier-Stokes (RANS) Equations. The discretization of basic equations, boundary condition settings and solving process were described briefly. Using the fluid model and structure model, the tall buildings immersed in air boundary layer were numerically simulated. Compared with the results of wind tunnel test, numerical simulation method exhibits reasonable accuracy and reliability. Comparison of two turbulence models, shear stress transport (SST) k-ωmodel and renormalization group (RNG) k-εmodel reveals that the RNG k-εmodel has more precision than SST k-ωmodel. Then the transient analysis of single tall building was simulated using RNG k-εmodel. The fluid field and structural response and their variation with time were discussed. The results showed that the maximum dynamic structural response is larger than that in static analysis. Finally the static and dynamic interference effects were numerical simulated using two buildings as example. The analysis reveals that the airflow separation and vortex shedding under interference condition are changed greatly compared with single building. Correspondingly the wind load on building surfaces is significantly changed. Furthermore the maximum structural response under interference condition is significantly larger than that of single condition. Simulations and analysis in this paper has a better reference value to the wind resistant design and research of tall and high-rise buildings.