基于流固耦合的骨架膜结构优化

Optimization of skeleton membrane structure based on fluid-solid coupling

为了实现骨架膜结构的优化设计,基于ANSYS平台考虑了膜结构在风荷载作用下的结构变形对建筑表面风压分布的影响,采用双向流固弱耦合的方法对某低矮类膜建筑在不同风向角下的定常风场特性与其围护骨架膜结构的风致结构受力进行了研究,并以此为依据采用响应面法对骨架膜结构中各杆件的截面尺寸进行了优化.结果表明:仿真所得建筑表面风压分布与同类模型风压实测数据、风洞试验数据以及国家相应规范吻合较好;不同风向角下骨架膜结构的受力状态不同,其中90°风向为该结构的最不利工况;采用响应面法得到了该骨架膜结构中各杆件的截面尺寸对结构受力的影响关系,并将该结构整体质量降低了14.73%.

In order to optimize the design for skeleton membrane structure,basing on ANSYS platform and considering for the influence of structural deformation of the skeleton membrane structure under wind load on the wind pressure distribution on building surface,a bidirectional fluid-solid weak coupling method was used to study the steady wind field characteristics of a low-rise membrane building at different wind attack angles as well as the wind-induced structural forces on enclosing skeleton membrane structure.According to above,the section size of each rod in the skeleton membrane structure was optimized by a response surface method.The results show that the wind pressure distribution on building surface obtained by simulation is in good agreement with the wind pressure data measured for similar models,wind tunnel test data and corresponding national standards.The stress state of skeleton membrane structure changes with the wind attack angle,of which 90°wind attack angle is the most unfavorable condition.The influence of section size of each rod on the structural stress of skeleton membrane structure is obtained by the response surface method,and the overall mass of the structure reduces by 14.73%.