Numerical Simulation Of Wind Loads And Wind-induced Interference Effects On Supertall Twin Towers

Wind load is one of the important loads needing to be considered in structural design,for the tall buildings, span structures, towering structure such as wind load and may even become the control loads of structural design.For some structures that it is difficult to determine wind load such as structures with complex shape, height exceeding limit, serious interference, currently the wind tunnel experiments is the main method to predict the wind load.With the development of Bluff Body Berodynamics in recent years, numerical simulation have been able to be accurately calculate wind load in the structural engineering and has become an important adjunct of wind tunnel experiments to structural wind engineering at present.Compared with the wind tunnel experiments, numerical simulation,with lower cost and higher efficiency, being able to simulate the boundary conditions more accurately and make a simulation of the full size and whole process to buildings and get the continuous distribution information of each physical quantity, have the more extensive application.Based on the FLUENT14.5 software platform, the research on numerical simulation of structural wind engineering in this paper mainly focuses on the following aspects:①Study on the method of numerical simulation.In this paper, make a numerical simulation of CAARC standard tall building model based on the FLUENT14.5 software platform, and analyze the influence of surface grid, wall function, discrete format, turbulence model and wind flow angle on the results of numerical simulation by comparing the results of numerical simulation and data of TJ- 2 wind tunnel experiment. Provide the basis for parameters selection of the numerical simulation, and verify the feasibility of the numerical simulation.②Analyze the wind load distribution and wind-induced interference effects by simulating a super high-rise towers structure. Qualitative analysis is conducted on the wind pressure distribution and the flow field around the surface of the building. Make an analysis of the interference effects between the twin towers from the point of wind pressure, shape coefficient, the base moment.make a comprison between numerical simulation with the standard method on the wind force of building wall and the alongwind base moment,and the reliability of the results is verified. The results showed that the “shielding effect” and “narrow effect” is the main interference between the twin towers. The topical negative pressure of the wall on the sides of the narrow road increased one times, and the interference factor of shape coefficient reached 1.45. The mutual interference of the Twin Towers has little effect on the body coefficient of the other wall and the base moment, and the interference factor is below 1.1. The structure is extremely disadvantageous when the twin towers is tied, the base torque and the base moment of the X axis are the maximum, while the base bending moment of the Y axis is not 0.③ A numerical simulation of the high-rise twin tower and the surrounding buildings in the Shapingba comprehensive transportation hub is given, and the wind pressure distribution of the building under different wind direction is presented. The analysis is focused on the most unfavorable load of building and interference factor. Under the interference of the buildings, the interference factor of shape coefficient of maximum positive pressure on the building walls to 1.099, the maximum interference factor of negative pressure to 1.18, the base bending moment of around the X axis increased by nearly 16%, the base bending moment around the Y axis increased by 9%, the base torque under the interference effect decreased.