充气膜结构的找形方法及风振分析理论研究

项目名称： 充气膜结构的找形方法及风振分析理论研究

项目编号： No.50808122

项目类型： 青年科学基金项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 何艳丽

作者单位： 上海交通大学

项目金额： 20万元

中文摘要： 对指定外形的充气膜结构，以指定外形为拟定的成形目标，首先建立目标外形的力密度平衡方程，然后采用线性调整理论，不断迭代求解得到指定外形对应的应力分布，然后褪去应力，得到充气膜结构的近似零应力态。在此零应力态上再导入预应力，则可以得到的充气膜结构的各种应力形态，并且与结构指定的外形一致。以此方法建立了一套用于指定建筑外形的充气膜结构成形方法。充气膜结构在风荷载作用下，膜内封闭的气体与膜面一起运动，把内部封闭气体作为可压缩气体，满足理想气体状态方程，把外部空气作为不可压缩气体，采用任意的拉格朗日-欧拉方法来描述内外流体与结构统一的流固耦合运动方程，选取合适的湍流计算模型，采用分区求解算法，包含流体域、结构域和网格域三个计算模块，三者通过压力、速度和位移相互影响和传递，实现了充气膜结构及其周围流场的实时风振响应分析，由此建立了充气膜结构的流固耦合风振分析理论，能为充气膜结构工程抗风设计提供风振响应评估的依据。

中文关键词： 充气膜结构;成形分析;零应力态;流固耦合;风振分析理论

英文摘要： For the shape generation of inflatable membrane structures having specified geometry, the aim of form-finding is the specified geometry, the force-density balance equations are set up firstly, adopting linear adjustment theory, the stress compatible with the specified geometry can be obtained through iteration method, then taking off the stress, the approximate zore-stress state of the inflatable membrane structure can be obtainded. Inflating the membrane structure based upon the zore-stress state, the surface shape match along with prestress will be identical to the specified geometry. So, the shape generation method for inflatable membrane structures having specified geometry is established. Both membrane and enclosed gas of inflatable membrane structures would move under windloads, the fluid-structure coulped equations between fluid and structures were described adopting arbitrary Lagrangian-Eulerian method, considering the enclosed air is compressible gas, serving equation of state of ideal gas, and the ouside air is uncompressible gas. Choosing suitable turbulence model, the partition solution algorithm is adopted to realize the real time simulation of flow domain including fluid region, structure region and grid region, three modules are influenced and transferred mutually through pressure, velocity and displacement. Therefore, the wind vibration anlysis theory is established to provide wind loads and responses evaluation for infalatable membrane structures.

英文关键词： Inflatable membrane structures; Shape generation analysis; zero-stress state; Fluid-structure interaction; Wind vibration analysis theory