On Wind Action Response Of Air-supported Structures Considering Wind And Structure Coupling

Pneumatic membrane architecture has the advantages of beauty in appearance, lightweight and high strength, economic and practical. It's very applicable to build large stadiums, exhibition halls, warehouses and other large span space structures. But as a typical flexible structure, pneumatic membrane structure is a very sensitive to wind load. In the current design code, the research on the wind resistant ability of inflatable membrane structure is scarce. Therefore, in this Paper, we considered fluid-structure coupling effect to study the structure's shape coefficient.In this Paper, using system-coupling component of a large finite element software ANSYS to analyze the pneumatic membrane structure under fluid-structure interaction influence. Before performing the fluid-structure interaction simulation, it's necessary to prepare APDL for the membrane structure form-finding and UDF for simulating wind field. Through solving strategy based on weak coupling, the two-way coupling calculation of two physical fields can be realized on the boundary between. And the reliability of calculation is verified by examples.Then, according to the research plan, the flexible and rigid models of inflatable membrane structure were made respectively which were different from rise-span ratio and aspect ratio, of which simulation data was obtained by calculation under considering the effect of fluid-structure interaction and changing internal pressure and changing wind direction on flexible models and only the effect of changing wind direction on rigid models. Based on comparison and analysis among the different working conditions of simulation results, it found that most regions of inflatable membrane structure surface born negative pressure except the Part of windward and leeward born positive pressure. Under wind load, around the structure produce different levels of depression and the height of the top of structure was increased. Under the same conditions, the wind pressure distribution considering the effect of fluid-structure interaction was significantly larger than that without considering the effect of fluid-structure interaction, hence it's unreliable to use the shape coefficient of rigid model for designing pneumatic membrane structure. It is necessary to correct the wind pressure distribution coefficient of the rigid mode when practicing design. The wind pressure distribution and the displacement response of pneumatic membrane structure will be affected by the wind direction, inner pressure, length-width ratio, rise-sPan ratio and so on.