Numerical Simulation Of Fluid-Structure Interaction For Wind-induced Response Of High-rise Steel Structure On The Roof Of High-rise Building

In recent years, both high-rise and towering structure have been developed to be much higher and softer with smaller stiffness and damping. And with the need in function of use of high-rise, it is becoming a more common phenomenon that high-rise steel towers are set on the roofs of high-rise and super high-rise buildings. Therefore, structure has become increasingly sensitive to wind and dynamic response becomes more complex. Currently, there still exist many problems in the analysis of wind-induced response of such complex structures in the atmospheric boundary layer using numerical simulation technology. So it is essential to carry out further study on the wind resistance of high-rise structure on the top of high-rise buildings in the field of engineering and research.In recent research of the wind-resistant design of high-rise structure on the top of towering building, the wind resistance is generally calculated respectively, with high-rise roof structure and its main structure being separated. Usually the impact of high-rise structure is not considered in the main structure, however, with the height of towering high-rise structure increasing, when the high-rise structure is subjected to strong wind load effect, the impact of this interaction can not be ignored.First of all, this paper shows the description and algorithm of ALE (Arbitrary Lagrangian-Eulerian), fluid dynamics control equations of fluid-solid coupling. Then the closed high-rise steel structure on the roof of the same high-rise building is numerically simulated in high-reynolds uniform flow field simulated with three models:standard k-ε model, Wilcox k-co model and LES model. Numerical simulation results demonstrate LES model is more suitable for the wind-resistant analysis of high-rise steel structure. LES turbulence model is then used to establish three model structure forms: high-rise building model with towering structure, towering structure model placed in the ground and high-rise building model without towering structure. Finite Element rigid model and aeroelastic model considering the fluid structure interaction are established for each of these three types of structures. By comparing wind pressure coefficient distribution, wind load shape coefficient and wind vibration coefficient obtained through numerical simulation, we can research the interaction between towering structure and main building. Besides, rigid model is established for the towering structure in different places of the top of main building to compare and analyze the effect of location factors on the wind load effect of the towering structure on the top of the building.In the seepage-stress coupled analysis of practical engineering, this paper presents a new modeling and analysis method to meet the requirement of engineering design, in view of the indispensable effect of high-rise building on the towering structure on its top. And then in accordance with this method, the launch tower project on the roof of Hailar News Center is chosen as the engineering background. With numerical simulation being performed and wind tunnel test data being compared, it is proved that this method not only meets the design requirement, but also to ensures sufficient accuracy of the results, which provides a practical analysis method for solving practical engineering problems.