Numericai, Simulation fo Wind Pressure and Wind Vibration Response of Long-Span Space Structure
|School||Shanghai Jiaotong University|
|Keywords||long-span spatial structure fluid-structure interaction wind pressure distribution wind-induced vibration effect|
The problem of spatial structure resisting wind load has been a more and moreimportant issue as the structure span becomes lager with the shape more complex and thematerial lighter. The large cantilever roof of the stadium, as a typical structure verysensitive to wind induced vibration, the wind load is the key factor to its safety. Membranestructures have been widely used due to their basic features of light weighted and lowstiffness. Thus large deformation and vibration will be caused by the external wind load.Simultaneously, the changed structure position after deformation will also affect thedistribution of wind pressure and velocity fields in return. In this way the fluid-solidcoupling effects happen.In this thesis, the problems about large-span spatial structure resisting wind,wind-structure interaction and related numerical simulation methods are carefullysummarized. The discretizations and solutions of the governing dynamic equations of thefluid and structure are presented, and the parameters chosen on the interface of the fluidand structure domain are given. The computational domains, boundary conditions,turbulence models and relative parameter settings used in the numerical computations aresystematically shown. Afterwards benchmark problems are used to verify the models bycomparing the current numerical results with other results from related references,including data from wind tunnel experiments and from other numerical simulations.In this paper wind engineering problems concerning large cantilever roof aresimulated using commercial CFD software, FLUENT. The effects of wind incomingdirections, roof angles, ventilation rates, as well as cornice on wind pressure distributionson stiff roof are analyzed. Considering the flow characteristics around the roof, two typesof aerodynamics controlling devices are designed, and then tested through numericalsimulation comparisons. In the next section, the wind effects on hat-shape spatialmembrane structure and mountain range-shape spatial membrane structure are simulated by ADINA software. Geometrical parameters include the changes of open and close formsof the hat top position, initial pre-stress and wind speed. The dynamic effects include thewind-induced displacements, speed, acceleration, and transient amplification coefficient ofdisplacement. These simulated results of wind pressure and wind-induced vibrating effectsmay provide useful information for related engineering designs.